Comparison of TWF and THF

[NullAshton]

I was bored last night and today, and decided to do a few calculations. I found out that one of my hunches was correct, that Two-Weapon Fighting can be superior.

Suppose there are two level 20 fighters. One is your standard fighter grunt with power attack and a greatsword. The other dual-wields bastard swords with oversized two-weapon fighting. Who do you think does the most damage?

Here are the average damage I calculated. Sorry if it's confusing, I just wrote it down as I calculated it in notepad.

Power attack:      2    5    10    15    20

Greatsword:        136   160   200   240   280
Bastard Swords:    128.5 149.5 184.5 219.5 254.5

Now with 1d6 extra damage.

Greatsword:        150   174   214   254   294
Bastard Swords:    153   174   209   244   279

2d6 extra damage now.

Greatsword:        164   188   228   268   308
Bastard Swords:    177.5 198.5 233.5 268.5 303.5

3d6 extra damage.

Greatsword:        178   202   242   282   322
Bastard Swords:    202   223   258   293   328

Note that for all two-weapon fighting calculations, power attack penalty is reduced by 2 with the requisite penalty to damage. That is why the power attack amounts start at 2, instead of 0.

Also note that I do not include shock trooper or leap attack in my calculations. This is because it's plainly obvious that two-weapon fighting is inferior on a charge. I think there's a feat that lets you attack with both weapons on a charge... but not sure where it is. If I find it, I can probably do some more calculations with charges.

Comments on this? Any mistakes I made while calculating the average damages?

EDIT: Okay. Strength for THF adjusted to +12 modifier, still +10 for two-weapon fighting.

[Talya]

Interesting.

Problems with this:

For the dual weilder, you've got TWF, ITWF, GTWF, OTWF. I'm assuming you managed WF and WS since you are using two of the same weapons. That's 6 of 19 feats used on dual weilding. You could add a whole lot of fun to the THF fighter with the 4 extra dual weilding feats.

In order to get GTWF on a fighter, he needs 19 dex. That will lower his strength. Did you factor that into the damage calculations?

[NullAshton]

Uh... no, not quite. I kind of went for the simple route, and assumed 10 strength. I'll think of a way to factor that in soon.

EDIT: Adjustments completed. Two-weapon Fighting is still superior for 2d6 and 3d6 damages.

[Rigeld2]

Making the 2hander have a 20 STR, and the TWFer have a 16 STR would be mostly realistic... the 2hander should probably be somewhere near 28, but some people would argue that the DM should be smacked for allowing such overpowered magic.

[Matthew]

Null, show your working. This doesn't make much sense as it stands.

[Catch]

You forgot to take into account that if he's dual-wielding bastard swords, that's going to take a bite out the TWF fighter's damage.

The issue I have with your chart is that it assumes that every attack connects.

[Rigeld2]

Null, show your working. This doesn't make much sense as it stands.

QFT

1234567

[Matthew]

There are so many variables involved with this sort of calculation, not least of which the effect of magic - in particular Speed Weapons.

Here's the junk from the last time I did this up to Level 10:

Level 1

Spoiler

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Fighter 1 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave,
[Base Attack Bonus (1) + Weapon Focus (1) – Power Attack (1) + Flanking (2)] = (3 AB)
[Great Sword (2D6) + Power Attack (2)] = (2D6+2, 9.0)

Fighter 1 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave,
[Base Attack Bonus (1) + Weapon Focus (1) – Power Attack (1) + Flanking (2)] = (3 AB)
[Long Sword (1D8) + Power Attack (1)] = (1D8+1, 5.5)

Fighter 1 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting,
[Base Attack Bonus (1) – Two Weapon Fighting (2) + Flanking (2)] = (1 AB)
[Long Sword (1D8)] = (1D8, 4.5)
[Base Attack Bonus (1) – Two Weapon Fighting (2) + Flanking (2)] = (1 AB)
[Long Sword (1D8)] = (1D8, 4.5)

Rogue 1 A (Short Sword)

Feats: [-], [-],
[Base Attack Bonus (0) + Flanking (2)] = (2 AB)
[Short Sword (1D6) + Sneak Attack (1D6)] = (2D6, 7.0)

Rogue 1 B (Two Short Swords)

Feats: Two Weapon Fighting,
[Base Attack Bonus (0) – Two Weapon Fighting (2) + Flanking (2)] = (0 AB)
[Short Sword (1D6) + Sneak Attack (1D6)] = (2D6, 7.0)
[Base Attack Bonus (0) – Two Weapon Fighting (2) + Flanking (2)] = (0 AB)
[Short Sword (1D6) + Sneak Attack (1D6)] = (2D6, 7.0)

Attacking Armour Class 10

Fighter 1 A 70% (2D6+2, 9.0)
Fighter 1 B 70% (1D8+1, 5.5)
Fighter 1 C 60% (1D8, 4.5) / 60% (1D8, 4.5)
Rogue 1 A 65% (2D6, 7.0)
Rogue 1 B 55% (2D6, 7.0) / 55% (2D6, 7.0)

Attacking Armour Class 12

Fighter 1 A 60% (2D6+2, 9.0)
Fighter 1 B 60% (1D8+1, 5.5)
Fighter 1 C 50% (1D8, 4.5) / 50% (1D8, 4.5)
Rogue 1 A 55% (2D6, 7.0)
Rogue 1 B 45% (2D6, 7.0) / 45% (2D6, 7.0)

Attacking Armour Class 14

Fighter 1 A 50% (2D6+2, 9.0)
Fighter 1 B 50% (1D8+1, 5.5)
Fighter 1 C 40% (1D8, 4.5) / 40% (1D8, 4.5)
Rogue 1 A 45% (2D6, 7.0)
Rogue 1 B 35% (2D6, 7.0) / 35% (2D6, 7.0)

Attacking Armour Class 16

Fighter 1 A 40% (2D6+2, 9.0)
Fighter 1 B 40% (1D8+1, 5.5)
Fighter 1 C 30% (1D8, 4.5) / 30% (1D8, 4.5)
Rogue 1 A 35% (2D6, 7.0)
Rogue 1 B 25% (2D6, 7.0) / 25% (2D6, 7.0)

Attacking Armour Class 18

Fighter 1 A 30% (2D6+2, 9.0)
Fighter 1 B 30% (1D8+1, 5.5)
Fighter 1 C 20% (1D8, 4.5) / 20% (1D8, 4.5)
Rogue 1 A 25% (2D6, 7.0)
Rogue 1 B 15% (2D6, 7.0) / 15% (2D6, 7.0)

Attacking Armour Class 20

Fighter 1 A 20% (2D6+2, 9.0)
Fighter 1 B 20% (1D8+1, 5.5)
Fighter 1 C 10% (1D8, 4.5) / 10% (1D8, 4.5)
Rogue 1 A 15% (2D6, 7.0)
Rogue 1 B 5% (2D6, 7.0) / 5% (2D6, 7.0)

Level 2

Spoiler

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Fighter 2 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-],
[Base Attack Bonus (2) + Weapon Focus (1) – Power Attack (2) + Flanking (2)] = (3 AB)
[Great Sword (2D6) + Power Attack (4)] = (2D6+4, 11.0)

Fighter 2 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-],
[Base Attack Bonus (2) + Weapon Focus (1) – Power Attack (2) + Flanking (2)] = (3 AB)
[Long Sword (1D8) + Power Attack (2)] = (1D8+2, 6.5)

Fighter 2 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword),
[Base Attack Bonus (2) + Weapon Focus (1) – Two Weapon Fighting (2) + Flanking (2)] = (3 AB)
[Long Sword (1D8)] = (1D8, 4.5)
[Base Attack Bonus (2) + Weapon Focus (1) – Two Weapon Fighting (2) + Flanking (2)] = (3 AB)
[Long Sword (1D8)] = (1D8, 4.5)

Rogue 2 A (Short Sword)

Feats: [-], [-],
[Base Attack Bonus (1) + Flanking (2)] = (3 AB)
[Short Sword (1D6) + Sneak Attack (1D6)] = (2D6, 7.0)

Rogue 2 B (Two Short Swords)

Feats: Two Weapon Fighting,
[Base Attack Bonus (1) – Two Weapon Fighting (2) + Flanking (2)] = (1 AB)
[Short Sword (1D6) + Sneak Attack (1D6)] = (2D6, 7.0)
[Base Attack Bonus (1) – Two Weapon Fighting (2) + Flanking (2)] = (1 AB)
[Short Sword (1D6) + Sneak Attack (1D6)] = (2D6, 7.0)

Attacking Armour Class 10

Fighter 2 A 70% (2D6+4, 11.0)
Fighter 2 B 70% (1D8+2, 6.5)
Fighter 2 C 70% (1D8, 4.5) / 70% (1D8, 4.5)
Rogue 2 A 70% (2D6, 7.0)
Rogue 2 B 60% (2D6, 7.0) / 60% (2D6, 7.0)

Attacking Armour Class 12

Fighter 2 A 60% (2D6+4, 11.0)
Fighter 2 B 60% (1D8+2, 6.5)
Fighter 2 C 60% (1D8, 4.5) / 60% (1D8, 4.5)
Rogue 2 A 60% (2D6, 7.0)
Rogue 2 B 50% (2D6, 7.0) / 50% (2D6, 7.0)

Attacking Armour Class 14

Fighter 2 A 50% (2D6+4, 11.0)
Fighter 2 B 50% (1D8+2, 6.5)
Fighter 2 C 50% (1D8, 4.5) / 50% (1D8, 4.5)
Rogue 2 A 50% (2D6, 7.0)
Rogue 2 B 40% (2D6, 7.0) / 40% (2D6, 7.0)

Attacking Armour Class 16

Fighter 2 A 40% (2D6+4, 11.0)
Fighter 2 B 40% (1D8+2, 6.5)
Fighter 2 C 40% (1D8, 4.5) / 40% (1D8, 4.5)
Rogue 2 A 40% (2D6, 7.0)
Rogue 2 B 30% (2D6, 7.0) / 30% (2D6, 7.0)

Attacking Armour Class 18

Fighter 2 A 30% (2D6+4, 11.0)
Fighter 2 B 30% (1D8+2, 6.5)
Fighter 2 C 30% (1D8, 4.5) / 30% (1D8, 4.5)
Rogue 2 A 30% (2D6, 7.0)
Rogue 2 B 20% (2D6, 7.0) / 20% (2D6, 7.0)

Attacking Armour Class 20

Fighter 2 A 20% (2D6+4, 11.0)
Fighter 2 B 20% (1D8+2, 6.5)
Fighter 2 C 20% (1D8, 4.5) / 20% (1D8, 4.5)
Rogue 2 A 20% (2D6, 7.0)
Rogue 2 B 10% (2D6, 7.0) / 10% (2D6, 7.0)

Level 3

Spoiler

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Fighter 3 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-],
[Base Attack Bonus (3) + Weapon Focus (1) – Power Attack (2) + Flanking (2)] = (4 AB)
[Great Sword (2D6) + Power Attack (4)] = (2D6+4, 11.0)

Fighter 3 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-],
[Base Attack Bonus (3) + Weapon Focus (1) – Power Attack (2) + Flanking (2)] = (4 AB)
[Long Sword (1D8) + Power Attack (2)] = (1D8+2, 6.5)

Fighter 3 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Power Attack,
[Base Attack Bonus (3) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (0) + Flanking (2)] = (4 AB)
[Long Sword (1D8) + Power Attack (0)] = (1D8, 4.5)
[Base Attack Bonus (3) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (0) + Flanking (2)] = (4 AB)
[Long Sword (1D8) + Power Attack (0)] = (1D8, 4.5)

Rogue 3 A (Short Sword)

Feats: [-], [-], [-],
[Base Attack Bonus (2) + Flanking (2)] = (4 AB)
[Short Sword (1D6) + Sneak Attack (2D6)] = (3D6, 10.5)

Rogue 3 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse,
[Base Attack Bonus (2) – Two Weapon Fighting (2) + Flanking (2)] = (2 AB)
[Short Sword (1D6) + Sneak Attack (2D6)] = (3D6, 10.5)
[Base Attack Bonus (2) – Two Weapon Fighting (2) + Flanking (2)] = (2 AB)
[Short Sword (1D6) + Sneak Attack (2D6)] = (3D6, 10.5)

Attacking Armour Class 10

Fighter 3 A 75% (2D6+4, 11.0)
Fighter 3 B 75% (1D8+2, 6.5)
Fighter 3 C 75% (1D8, 4.5) / 75% (1D8, 4.5)
Rogue 3 A 75% (3D6, 10.5)
Rogue 3 B 65% (3D6, 10.5) / 65% (3D6, 10.5)

Attacking Armour Class 12

Fighter 3 A 65% (2D6+4, 11.0)
Fighter 3 B 65% (1D8+2, 6.5)
Fighter 3 C 65% (1D8, 4.5) / 65% (1D8, 4.5)
Rogue 3 A 65% (3D6, 10.5)
Rogue 3 B 55% (3D6, 10.5) / 55% (3D6, 10.5)

Attacking Armour Class 14

Fighter 3 A 55% (2D6+4, 11.0)
Fighter 3 B 55% (1D8+2, 6.5)
Fighter 3 C 55% (1D8, 4.5) / 55% (1D8, 4.5)
Rogue 3 A 55% (3D6, 10.5)
Rogue 3 B 45% (3D6, 10.5) / 45% (3D6, 10.5)

Attacking Armour Class 16

Fighter 3 A 45% (2D6+4, 11.0)
Fighter 3 B 45% (1D8+2, 6.5)
Fighter 3 C 45% (1D8, 4.5) / 45% (1D8, 4.5)
Rogue 3 A 45% (3D6, 10.5)
Rogue 3 B 35% (3D6, 10.5) / 35% (3D6, 10.5)

Attacking Armour Class 18

Fighter 3 A 35% (2D6+4, 11.0)
Fighter 3 B 35% (1D8+2, 6.5)
Fighter 3 C 35% (1D8, 4.5) / 35% (1D8, 4.5)
Rogue 3 A 35% (3D6, 10.5)
Rogue 3 B 25% (3D6, 10.5) / 25% (3D6, 10.5)

Attacking Armour Class 20

Fighter 3 A 25% (2D6+4, 11.0)
Fighter 3 B 25% (1D8+2, 6.5)
Fighter 3 C 25% (1D8, 4.5) / 25% (1D8, 4.5)
Rogue 3 A 25% (3D6, 10.5)
Rogue 3 B 15% (3D6, 10.5) / 15% (3D6, 10.5)

Level 4

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Fighter 4 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword),
[Base Attack Bonus (4) + Weapon Focus (1) – Power Attack (2) + Flanking (2)] = (5 AB)
[Great Sword (2D6) + Weapon Specialisation (2) + Power Attack (4)] = (2D6+6, 13.0)

Fighter 4 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword),
[Base Attack Bonus (4) + Weapon Focus (1) – Power Attack (2) + Flanking (2)] = (5 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (2)] = (1D8+4, 8.5)

Fighter 4 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword),
[Base Attack Bonus (4) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (0) + Flanking (2)] = (5 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (0)] = (1D8+2, 6.5)
[Base Attack Bonus (4) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (0) + Flanking (2)] = (5 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (0)] = (1D8+2, 6.5)

Rogue 4 A (Short Sword)

Feats: None Relevant,
[Base Attack Bonus (3) + Flanking (2)] = (5 AB)
[Short Sword (1D6) + Sneak Attack (2D6)] = (3D6, 10.5)

Rogue 4 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse,
[Base Attack Bonus (3) – Two Weapon Fighting (2) + Flanking (2)] = (3 AB)
[Short Sword (1D6) + Sneak Attack (2D6)] = (3D6, 10.5)
[Base Attack Bonus (3) – Two Weapon Fighting (2) + Flanking (2)] = (3 AB)
[Short Sword (1D6) + Sneak Attack (2D6)] = (3D6, 10.5)

Attacking Armour Class 10

Fighter 4 A 80% (2D6+6, 13.0)
Fighter 4 B 80% (1D8+4, 8.5)
Fighter 4 C 80% (1D8+2, 6.5) / 80% (1D8, 6.5)
Rogue 4 A 80% (3D6, 10.5)
Rogue 4 B 70% (3D6, 10.5) / 70% (3D6, 10.5)

Attacking Armour Class 12

Fighter 4 A 70% (2D6+6, 13.0)
Fighter 4 B 70% (1D8+4, 8.5)
Fighter 4 C 70% (1D8+2, 6.5) / 70% (1D8+2, 6.5)
Rogue 4 A 70% (3D6, 10.5)
Rogue 4 B 60% (3D6, 10.5) / 60% (3D6, 10.5)

Attacking Armour Class 14

Fighter 4 A 60% (2D6+6, 13.0)
Fighter 4 B 60% (1D8+4, 8.5)
Fighter 4 C 60% (1D8+2, 6.5) / 60% (1D8+2, 6.5)
Rogue 4 A 60% (3D6, 10.5)
Rogue 4 B 50% (3D6, 10.5) / 50% (3D6, 10.5)

Attacking Armour Class 16

Fighter 4 A 50% (2D6+6, 13.0)
Fighter 4 B 50% (1D8+4, 8.5)
Fighter 4 C 50% (1D8+2, 6.5) / 50% (1D8+2, 6.5)
Rogue 4 A 50% (3D6, 10.5)
Rogue 4 B 40% (3D6, 10.5) / 40% (3D6, 10.5)

Attacking Armour Class 18

Fighter 4 A 40% (2D6+6, 13.0)
Fighter 4 B 40% (1D8+4, 8.5)
Fighter 4 C 40% (1D8+2, 6.5) / 40% (1D8+2, 6.5)
Rogue 4 A 40% (3D6, 10.5)
Rogue 4 B 30% (3D6, 10.5) / 30% (3D6, 10.5)

Attacking Armour Class 20

Fighter 4 A 30% (2D6+6, 13.0)
Fighter 4 B 30% (1D8+4, 8.5)
Fighter 4 C 30% (1D8+2, 6.5) / 30% (1D8+2, 6.5)
Rogue 4 A 30% (3D6, 10.5)
Rogue 4 B 20% (3D6, 10.5) / 20% (3D6, 10.5)

Level 5

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Fighter 5 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword),
[Base Attack Bonus (5) + Weapon Focus (1) – Power Attack (3) + Flanking (2)] = (5 AB)
[Great Sword (2D6) + Weapon Specialisation (2) + Power Attack (6)] = (2D6+6, 15.0)

Fighter 5 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword),
[Base Attack Bonus (5) + Weapon Focus (1) – Power Attack (3) + Flanking (2)] = (5 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+5, 9.5)

Fighter 5 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword),
[Base Attack Bonus (5) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (1) + Flanking (2)] = (5 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (1)] = (1D8+3, 7.5)
[Base Attack Bonus (5) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (1) + Flanking (2)] = (5 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (1)] = (1D8+3, 7.5)

Rogue 5 A (Short Sword)

Feats: None Relevant,
[Base Attack Bonus (3) + Flanking (2)] = 5 AB
[Short Sword (1D6) + Sneak Attack (3D6)] = (4D6, 14.0)

Rogue 5 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse,
[Base Attack Bonus (3) – Two Weapon Fighting (2) + Flanking (2)] = 3 AB
[Short Sword (1D6) + Sneak Attack (3D6)] = (4D6, 14.0)
[Base Attack Bonus (3) – Two Weapon Fighting (2) + Flanking (2)] = 3 AB
[Short Sword (1D6) + Sneak Attack (3D6)] = (4D6, 14.0)

Attacking Armour Class 10

Fighter 5 A 80% (2D6+8, 15.0)
Fighter 5 B 80% (1D8+5, 9.5)
Fighter 5 C 80% (1D8+3, 7.5) / 80% (1D8+3, 7.5)
Rogue 5 A 80% (4D6, 14.0)
Rogue 5 B 70% (4D6, 14.0) / 70% (4D6, 14.0)

Attacking Armour Class 12

Fighter 5 A 70% (2D6+8, 15.0)
Fighter 5 B 70% (1D8+5, 9.5)
Fighter 5 C 70% (1D8+3, 7.5) / 70% (1D8+3, 7.5)
Rogue 5 A 70% (4D6, 14.0)
Rogue 5 B 60% (4D6, 14.0) / 60% (4D6, 14.0)

Attacking Armour Class 14

Fighter 5 A 60% (2D6+8, 15.0)
Fighter 5 B 60% (1D8+5, 9.5)
Fighter 5 C 60% (1D8+3, 7.5) / 60% (1D8+3, 7.5)
Rogue 5 A 60% (4D6, 14.0)
Rogue 5 B 50% (4D6, 14.0) / 50% (4D6, 14.0)

Attacking Armour Class 16

Fighter 5 A 50% (2D6+8, 15.0)
Fighter 5 B 50% (1D8+5, 9.5)
Fighter 5 C 50% (1D8+3, 7.5) / 50% (1D8+3, 7.5)
Rogue 5 A 50% (4D6, 14.0)
Rogue 5 B 40% (4D6, 14.0) / 40% (4D6, 14.0)

Attacking Armour Class 18

Fighter 5 A 40% (2D6+8, 15.0)
Fighter 5 B 40% (1D8+5, 9.5)
Fighter 5 C 40% (1D8+3, 7.5) / 40% (1D8+3, 7.5)
Rogue 5 A 40% (4D6, 14.0)
Rogue 5 B 30% (4D6, 14.0) / 30% (4D6, 14.0)

Attacking Armour Class 20

Fighter 5 A 30% (2D6+8, 15.0)
Fighter 5 B 30% (1D8+5, 9.5)
Fighter 5 C 30% (1D8+3, 7.5) / 30% (1D8+3, 7.5)
Rogue 5 A 30% (4D6, 14.0)
Rogue 5 B 20% (4D6, 14.0) / 20% (4D6, 14.0)

Level 6

Spoiler

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Fighter 6 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-],
[Base Attack Bonus (6) + Weapon Focus (1) – Power Attack (3) + Flanking (2)] = (6 AB)
[Great Sword (2D6) + Weapon Specialisation (2) + Power Attack (6)] = (2D6+6, 15.0)

Fighter 6 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-],
[Base Attack Bonus (6) + Weapon Focus (1) – Power Attack (3) + Flanking (2)] = (6 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+5, 9.5)

Fighter 6 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-],
[Base Attack Bonus (6) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (1) + Flanking (2)] = (6 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (1)] = (1D8+3, 7.5)
[Base Attack Bonus (6) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (1) + Flanking (2)] = (6 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (1)] = (1D8+3, 7.5)

Rogue 6 A (Short Sword)

Feats: None Relevant,
[Base Attack Bonus (4) + Flanking (2)] = 6 AB
[Short Sword (1D6) + Sneak Attack (3D6)] = (4D6, 14.0)

Rogue 6 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-],
[Base Attack Bonus (4) – Two Weapon Fighting (2) + Flanking (2)] = 4 AB
[Short Sword (1D6) + Sneak Attack (3D6)] = (4D6, 14.0)
[Base Attack Bonus (4) – Two Weapon Fighting (2) + Flanking (2)] = 4 AB
[Short Sword (1D6) + Sneak Attack (3D6)] = (4D6, 14.0)

Level 7

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Fighter 7 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-],
[Base Attack Bonus (7) + Weapon Focus (1) – Power Attack (3) + Flanking (2)] = (7 AB)
[Great Sword (2D6) + Weapon Specialisation (2) + Power Attack (6)] = (2D6+6, 15.0)

Fighter 7 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-],
[Base Attack Bonus (7) + Weapon Focus (1) – Power Attack (3) + Flanking (2)] = (7 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+5, 9.5)

Fighter 7 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-]
[Base Attack Bonus (7) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (1) + Flanking (2)] = (7 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (1)] = (1D8+3, 7.5)
[Base Attack Bonus (7) + Weapon Focus (1) – Two Weapon Fighting (2) – Power Attack (1) + Flanking (2)] = (7 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (1)] = (1D8+3, 7.5)

Rogue 7 A (Short Sword)

Feats: None Relevant,
[Base Attack Bonus (5) + Flanking (2)] = 7 AB
[Short Sword (1D6) + Sneak Attack (4D6)] = (5D6, 17.5)

Rogue 7 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-],
[Base Attack Bonus (5) – Two Weapon Fighting (2) + Flanking (2)] = 5 AB
[Short Sword (1D6) + Sneak Attack (4D6)] = (5D6, 17.5)
[Base Attack Bonus (5) – Two Weapon Fighting (2) + Flanking (2)] = 5 AB
[Short Sword (1D6) + Sneak Attack (4D6)] = (5D6, 17.5)

Level 8

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Fighter 8 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-], Greater Weapon Focus (Great Sword)
[Base Attack Bonus (8) + Weapon Focus (2) – Power Attack (4) + Flanking (2)] = (8 AB)
[Great Sword (2D6) + Weapon Specialisation (2) + Power Attack (8)] = (2D6+10, 17.0)

Fighter 8 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-], Greater Weapon Focus (Long Sword),
[Base Attack Bonus (8) + Weapon Focus (2) – Power Attack (4) + Flanking (2)] = (8 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (4)] = (1D8+6, 10.5)

Fighter 8 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-], Greater Weapon Focus (Long Sword),
[Base Attack Bonus (8) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (2) + Flanking (2)] = (8 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (2)] = (1D8+4, 8.5)
[Base Attack Bonus (8) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (2) + Flanking (2)] = (8 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (2)] = (1D8+4, 8.5)

Rogue 8 A (Short Sword)

Feats: None Relevant,
[Base Attack Bonus (6) + Flanking (2)] = 8 AB
[Short Sword (1D6) + Sneak Attack (4D6)] = (5D6, 17.5)

Rogue 8 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-],
[Base Attack Bonus (6) – Two Weapon Fighting (2) + Flanking (2)] = 6 AB
[Short Sword (1D6) + Sneak Attack (4D6)] = (5D6, 17.5)
[Base Attack Bonus (6) – Two Weapon Fighting (2) + Flanking (2)] = 6 AB
[Short Sword (1D6) + Sneak Attack (4D6)] = (5D6, 17.5)

Level 9

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Fighter 9 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-], Greater Weapon Focus (Great Sword), [-],
[Base Attack Bonus (9) + Weapon Focus (2) – Power Attack (5) + Flanking (2)] = (8 AB)
[Great Sword (2D6) + Weapon Specialisation (2) + Power Attack (10)] = (2D6+12, 19.0)

Fighter 9 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-], Greater Weapon Focus (Long Sword), [-],
[Base Attack Bonus (9) + Weapon Focus (2) – Power Attack (5) + Flanking (2)] = (8 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (5)] = (1D8+7, 11.5)

Fighter 9 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-], Greater Weapon Focus (Long Sword), [-],
[Base Attack Bonus (9) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (3) + Flanking (2)] = (9 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+4, 9.5)
[Base Attack Bonus (9) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (3) + Flanking (2)] = (9 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+4, 9.5)

Rogue 9 A (Short Sword)

Feats: [-], [-], [-], [-], [-],
[Base Attack Bonus (6) + Flanking (2)] = 8 AB
[Short Sword (1D6) + Sneak Attack (5D6)] = (6D6, 21.0)

Rogue 9 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-], Improved Two Weapon Fighting,
[Base Attack Bonus (6) – Two Weapon Fighting (2) + Flanking (2)] = 6 AB
[Short Sword (1D6) + Sneak Attack (5D6)] = (6D6, 21.0)
[Base Attack Bonus (6) – Two Weapon Fighting (2) + Flanking (2)] = 6 AB
[Short Sword (1D6) + Sneak Attack (5D6)] = (6D6, 21.0)

Level 10

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Fighter 10 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-], Greater Weapon Focus (Great Sword), [-], [-],
[Base Attack Bonus (10) + Weapon Focus (2) – Power Attack (5) + Flanking (2)] = (9 AB)
[Great Sword (2D6) + Weapon Specialisation (2) + Power Attack (10)] = (2D6+12, 19.0)

Fighter 10 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-], Greater Weapon Focus (Long Sword), [-], [-],
[Base Attack Bonus (10) + Weapon Focus (2) – Power Attack (5) + Flanking (2)] = (9 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (5)] = (1D8+7, 11.5)

Fighter 10 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-], Greater Weapon Focus (Long Sword), [-], [-],
[Base Attack Bonus (10) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (3) + Flanking (2)] = (9 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+4, 9.5)
[Base Attack Bonus (10) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (3) + Flanking (2)] = (9 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+4, 9.5)

Rogue 10 A (Short Sword)

Feats: [-], [-], [-], [-], [-],
[Base Attack Bonus (7) + Flanking (2)] = 9 AB
[Short Sword (1D6) + Sneak Attack (5D6)] = (6D6, 21.0)

Rogue 10 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-], Improved Two Weapon Fighting,
[Base Attack Bonus (7) – Two Weapon Fighting (2) + Flanking (2)] = 7 AB
[Short Sword (1D6) + Sneak Attack (5D6)] = (6D6, 21.0)
[Base Attack Bonus (7) – Two Weapon Fighting (2) + Flanking (2)] = 7 AB
[Short Sword (1D6) + Sneak Attack (5D6)] = (6D6, 21.0)

[NullAshton]

What do you mean it takes a bite out of the fighter's damage? I corrected for the -2 penalty by assuming that the TWF fighter power attacks for 2 points less than the listed power attack value. Thus, for the basic value of 2 power attack, THF gets 4 damage with every attack while the TWF fighter gets no extra damage with every attack. I corrected for that.

The way I calculated the stuff is simple. I took the base average damage for the weapons(7 for greatsword, 5.5 for bastard swords) and then added the base +5 enchantment for each weapon. Next I added the strength, 1.5 for each attack on the THF side. Strength for TWF is a bit more complicated, 4 attacks get 1.0 strength bonus, and three attacks get 0.5 strength bonus. Finnally, I added power attack. 4/10/20/30/40 per attack for THF, 0/3/8/13/18 per attack for TWF.

The damage calculations are again calculated so that BOTH fighters have the EXACT same chance of hitting their opponent. This thusly eliminates one of the factors, making my job of calculating a lot easier.

Incidentally, I have 34 strength for the THF, and 31 strength for the TWF guy. Yes, it assumes powerful magic, yes it means that the TWF takes cuts in other attributes. Mind you though, strength is one of the areas where the THF has the advantage, thusly the powerful magic aspect INCREASES the power of the two-handed fighting build.

EDIT: You have a point with speed weapons, I'll see if adding an extra attack for both TWF and THF does anything.

EDITEDIT: Also note that TWF by my calculations is ONLY effective if you have two +1d6 damage enchantments or more.

[Matthew]

And levels 11 to 15:

Level 11

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Fighter 11 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-], Greater Weapon Focus (Great Sword), [-], [-],
[Base Attack Bonus (11) + Weapon Focus (2) – Power Attack (5) + Flanking (2)] = (10 AB)
[Great Sword (2D6) + Weapon Specialisation (2) + Power Attack (10)] = (2D6+12, 19.0)

Fighter 11 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-], Greater Weapon Focus (Long Sword), [-], [-],
[Base Attack Bonus (11) + Weapon Focus (2) – Power Attack (5) + Flanking (2)] = (10 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (5)] = (1D8+7, 11.5)

Fighter 11 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-], Greater Weapon Focus (Long Sword), [-], [-],
[Base Attack Bonus (11) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (3) + Flanking (2)] = (10 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+4, 9.5)
[Base Attack Bonus (11) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (3) + Flanking (2)] = (10 AB)
[Long Sword (1D8) + Weapon Specialisation (2) + Power Attack (3)] = (1D8+4, 9.5)

Rogue 11 A (Short Sword)

Feats: [-], [-], [-], [-], [-],
[Base Attack Bonus (8) + Flanking (2)] = 10 AB
[Short Sword (1D6) + Sneak Attack (6D6)] = (7D6, 24.5.0)

Rogue 11 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-], Improved Two Weapon Fighting,
[Base Attack Bonus (8) – Two Weapon Fighting (2) + Flanking (2)] = 8 AB
[Short Sword (1D6) + Sneak Attack (6D6)] = (7D6, 24.5)
[Base Attack Bonus (8) – Two Weapon Fighting (2) + Flanking (2)] = 8 AB
[Short Sword (1D6) + Sneak Attack (6D6)] = (7D6, 24.5)

Level 12

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Fighter 12 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-], Greater Weapon Focus (Great Sword), [-], [-], Greater Weapon Specialisation (Great Sword), [-],
[Base Attack Bonus (12) + Weapon Focus (2) – Power Attack (5) + Flanking (2)] = (11 AB)
[Great Sword (2D6) + Weapon Specialisation (4) + Power Attack (10)] = (2D6+14, 21.0)

Fighter 12 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-], Greater Weapon Focus (Long Sword), [-], [-], Greater Weapon Specialisation (Long Sword), [-],
[Base Attack Bonus (12) + Weapon Focus (2) – Power Attack (5) + Flanking (2)] = (11 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (5)] = (1D8+9, 13.5)

Fighter 12 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-], Greater Weapon Focus (Long Sword), [-], [-], Greater Weapon Specialisation (Long Sword), Greater Two Weapon Fighting,
[Base Attack Bonus (12) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (3) + Flanking (2)] = (11 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (3)] = (1D8+7, 11.5)
[Base Attack Bonus (12) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (3) + Flanking (2)] = (11 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (3)] = (1D8+7, 11.5)

Rogue 12 A (Short Sword)

Feats: [-], [-], [-], [-], [-], [-],
[Base Attack Bonus (9) + Flanking (2)] = 11 AB
[Short Sword (1D6) + Sneak Attack (6D6)] = (7D6, 24.5)

Rogue 12 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-], Improved Two Weapon Fighting, [-],
[Base Attack Bonus (9) – Two Weapon Fighting (2) + Flanking (2)] = 9 AB
[Short Sword (1D6) + Sneak Attack (6D6)] = (7D6, 24.5)
[Base Attack Bonus (9) – Two Weapon Fighting (2) + Flanking (2)] = 9 AB
[Short Sword (1D6) + Sneak Attack (6D6)] = (7D6, 24.5)

Level 13

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Fighter 13 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-], Greater Weapon Focus (Great Sword), [-], [-], Greater Weapon Specialisation (Great Sword), [-],
[Base Attack Bonus (13) + Weapon Focus (2) – Power Attack (6) + Flanking (2)] = (11 AB)
[Great Sword (2D6) + Weapon Specialisation (4) + Power Attack (12)] = (2D6+16, 23.0)

Fighter 13 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-], Greater Weapon Focus (Long Sword), [-], [-], Greater Weapon Specialisation (Long Sword), [-],
[Base Attack Bonus (13) + Weapon Focus (2) – Power Attack (6) + Flanking (2)] = (11 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (6)] = (1D8+10, 14.5)

Fighter 13 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-], Greater Weapon Focus (Long Sword), [-], [-], Greater Weapon Specialisation, Greater Two Weapon Fighting,
[Base Attack Bonus (13) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (4) + Flanking (2)] = (11 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (4)] = (1D8+8, 12.5)
[Base Attack Bonus (13) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (4) + Flanking (2)] = (11 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (4)] = (1D8+8, 12.5)

Rogue 13 A (Short Sword)

Feats: [-], [-], [-], [-], [-], [-],
[Base Attack Bonus (9) + Flanking (2)] = 11 AB
[Short Sword (1D6) + Sneak Attack (7D6)] = (8D6, 28.0)

Rogue 13 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-], Improved Two Weapon Fighting, [-],
[Base Attack Bonus (9) – Two Weapon Fighting (2) + Flanking (2)] = 9 AB
[Short Sword (1D6) + Sneak Attack (7D6)] = (8D6, 28.0)
[Base Attack Bonus (9) – Two Weapon Fighting (2) + Flanking (2)] = 9 AB
[Short Sword (1D6) + Sneak Attack (7D6)] = (8D6, 28.0)

Level 14

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Fighter 14 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-], Greater Weapon Focus (Great Sword), [-], [-], Greater Weapon Specialisation (Great Sword), [-], [-],
[Base Attack Bonus (14) + Weapon Focus (2) – Power Attack (6) + Flanking (2)] = (12 AB)
[Great Sword (2D6) + Weapon Specialisation (4) + Power Attack (12)] = (2D6+16, 23.0)

Fighter 14 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-], Greater Weapon Focus (Long Sword), [-], [-], Greater Weapon Specialisation (Long Sword), [-], [-],
[Base Attack Bonus (14) + Weapon Focus (2) – Power Attack (6) + Flanking (2)] = (12 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (6)] = (1D8+10, 14.5)

Fighter 14 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-], Greater Weapon Focus (Long Sword), [-], [-], Greater Weapon Specialisation, Greater Two Weapon Fighting, [-],
[Base Attack Bonus (14) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (4) + Flanking (2)] = (12 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (4)] = (1D8+8, 12.5)
[Base Attack Bonus (14) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (4) + Flanking (2)] = (12 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (4)] = (1D8+8, 12.5)

Rogue 14 A (Short Sword)

Feats: [-], [-], [-], [-], [-], [-],
[Base Attack Bonus (10) + Flanking (2)] = 12 AB
[Short Sword (1D6) + Sneak Attack (7D6)] = (8D6, 28.0)

Rogue 14 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-], Improved Two Weapon Fighting, [-],
[Base Attack Bonus (10) – Two Weapon Fighting (2) + Flanking (2)] = 10 AB
[Short Sword (1D6) + Sneak Attack (7D6)] = (8D6, 28.0)
[Base Attack Bonus (10) – Two Weapon Fighting (2) + Flanking (2)] = 10 AB
[Short Sword (1D6) + Sneak Attack (7D6)] = (8D6, 28.0)

Level 15

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Fighter 15 A (Great Sword)

Feats: Weapon Focus (Great Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Great Sword), [-], [-], Greater Weapon Focus (Great Sword), [-], [-], Greater Weapon Specialisation (Great Sword), [-], [-], [-],
[Base Attack Bonus (15) + Weapon Focus (2) – Power Attack (6) + Flanking (2)] = (13 AB)
[Great Sword (2D6) + Weapon Specialisation (4) + Power Attack (12)] = (2D6+16, 23.0)

Fighter 15 B (Long Sword and Heavy Shield)

Feats: Weapon Focus (Long Sword), Power Attack, Cleave, [-], [-], Weapon Specialisation (Long Sword), [-], [-], Greater Weapon Focus (Long Sword), [-], [-], Greater Weapon Specialisation (Long Sword), [-], [-], [-],
[Base Attack Bonus (15) + Weapon Focus (2) – Power Attack (6) + Flanking (2)] = (13 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (6)] = (1D8+10, 14.5)

Fighter 15 C (Two Long Swords)

Feats: Two Weapon Fighting, Oversized Two Weapon Fighting, Weapon Focus (Long Sword), Weapon Specialisation (Long Sword), Improved Two Weapon Fighting, [-], Greater Weapon Focus (Long Sword), [-], [-], Greater Weapon Specialisation, Greater Two Weapon Fighting, [-], [-],
[Base Attack Bonus (15) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (4) + Flanking (2)] = (13 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (4)] = (1D8+8, 12.5)
[Base Attack Bonus (15) + Weapon Focus (2) – Two Weapon Fighting (2) – Power Attack (4) + Flanking (2)] = (13 AB)
[Long Sword (1D8) + Weapon Specialisation (4) + Power Attack (4)] = (1D8+8, 12.5)

Rogue 15 A (Short Sword)

Feats: [-], [-], [-], [-], [-], [-], [-],
[Base Attack Bonus (11) + Flanking (2)] = 13 AB
[Short Sword (1D6) + Sneak Attack (8D6)] = (9D6, 31.5)

Rogue 15 B (Two Short Swords)

Feats: Two Weapon Fighting, Weapon Finesse, [-], Improved Two Weapon Fighting, [-], [-],
[Base Attack Bonus (11) – Two Weapon Fighting (2) + Flanking (2)] = 11 AB
[Short Sword (1D6) + Sneak Attack (8D6)] = (9D6, 31.5)
[Base Attack Bonus (11) – Two Weapon Fighting (2) + Flanking (2)] = 11 AB
[Short Sword (1D6) + Sneak Attack (8D6)] = (9D6, 31.5)

[Talya]

You forgot to take into account that if he's dual-wielding bastard swords, that's going to take a bite out the TWF fighter's damage.

The issue I have with your chart is that it assumes that every attack connects.

I think he accounted for that by equalizing their actual attack bonus through power attack, if I understand him properly.

It didn't factor in the lower strength, though, which will be huge.

[Rigeld2]

Yeah... 19 DEX and 31 STR for the TWFer, and the THFer only has a 34 STR?

Thats... odd.

[Matthew]

What you probably should do is consider the case of a Character with the choice as to whether use a Two Handed Bastard Sword or Two Bastard Swords. Any Two Weapon Bastard Sword Fighter worth his salt ought to be Charging with a Bastard Sword Two Handed and then Quick Drawing a second Bastard Sword when the chance to execute a Full attack appears.

So, from round to round, the Bastard Sword Fighter is the guy who needs to be confident that he is doing more average damage by way of Two Weapon Fighting or Two Handed Fighting (Don't forget that a Two Handed Fighter can make Two Handed Attack and an Of Hand Improved Unarmed Strike or Armour Spike Attack)

[NullAshton]

Matthew, again, you're not calculating the damage correct. WITHOUT EXTRA DAMAGE, two-weapon fighting is still inferior. Yet as my calculations show, about 2d6 extra damage is where two-weapon fighting becomes superior. Still doing calculations for weapons of speed anyway.

Strength difference was only about 3 in my calculations. 18 strength and 16 starting dexterity for TWF build, with three more attribute points going into dexterity ovber level up. You take hits in other attributes, but dexterity is useful for other things as well. Let's just assume that the other fighter took a starting dex of 16 as well to get the maximum 3 dex bonus of mithral full plate.

EDIT: That quick-drawing bastard sword thing would be effective, yes, not to mention cinematic. Though it wouldn't alter calculations any, and thus isn't intergral to the comparison between a greatsword and two bastard swords.

[Talya]

Just for style sake, call them Katana. Same stats, I know, but dual weilding bastard-swords would look silly. A pair of Katana? Well, practicality be damned, they at least LOOK light enough to be possible.

[Matthew]

Those calculations only show what is possible without magic, they are just the basis for calculating this sort of thing. By all means, add on extra damage to those and the cost involved. The point is to show the working.

Don't forget Armour Spikes and Unarmed Strike.

[Edit] Nah, Katana are just Long Swords *runs for the hills*

[Rigeld2]

Strength difference was only about 3 in my calculations. 18 strength and 16 starting dexterity for TWF build, with three more attribute points going into dexterity ovber level up. You take hits in other attributes, but dexterity is useful for other things as well. Let's just assume that the other fighter took a starting dex of 16 as well to get the maximum 3 dex bonus of mithral full plate.

Poor builds - the TWFer doesnt get GTWF until level 20, or the THFer is way ahead in damage (due to higher STR) for thier entire career.

Not sure how much that relates to the chart, just stating a fact.

[Dausuul]

[Edited for mistake in damage values...]

Okay, hold on a minute. You are supposing that the TWF fighter wields two bastard swords and the THF fighter wields one greatsword, right?

So the TWF fighter is attacking at -2 for 2d10 damage; the THF fighter is attacking at no penalty for 3d6. We can disregard Strength, since both will be getting +1.5xStr to damage. Likewise, each one gets a 2-for-1 return on Power Attack.

The only difference we have to worry about, then, is that -2 attack penalty the TWF fighter suffers. We can compensate for that by having the THF fighter put an extra 2 into power attack, and end up with both fighters attacking at -2. The TWF fighter does 2d10 (average 11); the THF fighter does 2d6+4 (average 11).

Even money. But the TWF fighter has had to spend one to three feats to get TWF/Improved TWF/Greater TWF, plus another feat for Exotic Weapon Proficiency, and has somehow had to get a 19 Dex at the expense of some other stat.

Now, there are magic weapons to consider. We'll assume each has equal money to spend on weapons:

2,350 gp: TWF has masterwork bastard swords, THF has a +1 greatsword. TWF's damage is 11, THF's damage is 12.
4,670 gp: TWF has +1 bastard swords, THF has a +1 greatsword. TWF's damage is 13, THF's damage is 12.
16,670 gp: TWF has +2 bastard swords, THF has a +2 greatsword. TWF's damage is 15, THF's damage is 13.
36,670 gp: TWF has +3 bastard swords, THF has a +4 greatsword. TWF's damage is 17, THF's damage is 16. [The THF is spending another point on Power Attack here, to keep their attack bonuses equal.]
64,670 gp: TWF has +4 bastard swords, THF has a +5 greatsword. TWF's damage is 19, THF's damage is 18.
100,670 gp: TWF has +5 bastard swords, THF has a +5 wounding greatsword. TWF's damage is 21, THF's damage is 18 and 1 Con.

So the TWF is at most 2-3 points of damage ahead of the THF. On the other hand, the THF is almost certainly at least 2 and probably 4 points of Strength ahead of the TWF. Add in feats and the THF still wins.

[Talya]

Those calculations only show wha is possible without magic, they are just the basis for calculating this sort of thing. By all means, add on extra damage to those and the cost involved.

Don't forget Armour Spikes and Unarmed Strike.

[Edit] Nah, Katana are just Long Swords *runs for the hills*

Additional damage and effects to weapons heavily favor two weapon fighting (and increase the cost of it by a small fortune.) Just think, use a pair of vorpal kukri and forget about the oversized thing and damage. You've got 7 chances per round to roll a 20 and end it...odds are you get there within 3 rounds...

[Matthew]

Not so, if you have a Two Weapon Fighting Character with Enchanted Armour Spikes and a Two Handed Weapon... seriously, it's a joke, but it's totally legal. But yeah, Vorpal Weapons change the game variables again.

[NullAshton]

Poor builds - the TWFer doesnt get GTWF until level 20, or the THFer is way ahead in damage (due to higher STR) for thier entire career.

Not sure how much that relates to the chart, just stating a fact.

You actually really just need one point in strength... that would get the TWFer a -7 total average damage.

By my calculations, the TWFer gets GTWF at level 12. Three points of dexterity finished at level 12, thus qualifying for the feat then.

Incidentally... weapon specialization would increase the total TWF damage by 12 relative to THF...

[Talya]

So the TWF fighter is attacking at -2 for 2d10 damage; the THF fighter is attacking at no penalty for 3d6.

Last time I checked, a medium greatsword was 2d6.

[Rigeld2]

So the TWF fighter is attacking at -2 for 2d10 damage; the THF fighter is attacking at no penalty for 3d6. We can disregard Strength, since both will be getting +1.5xStr to damage. Likewise, each one gets a 2-for-1 return on Power Attack.

Um.
Greatsword
50 gp
2d6
19-20/×2


Where are you getting 3d6?

[NullAshton]

Last time I checked, a medium greatsword was 2d6.

Correct, thus it would be 7 average base damage per attack with a greatsword, with no other bonuses.

[Rigeld2]

Incidentally... weapon specialization would increase the total TWF damage by 12 relative to THF...

Umm...
THF attacks - 4
TWF attacks - 7
Difference - 3
Difference multiplied by the Weapon Spec damage - 6

How are you getting 12?

[NullAshton]

Umm...
THF attacks - 4
TWF attacks - 7
Difference - 3
Difference multiplied by the Weapon Spec damage - 6

How are you getting 12?

Greater weapon specialization stacks with weapon specialization.

[Matthew]

Probably from Greater Weapon Specialisation.

[Simu Ninja]

[Rigeld2]

Greater weapon specialization stacks with weapon specialization.

So Greater Weapon Spec would increase the damage by 12... Weapon Spec only increases it by 6.

When analyzing something, try to be exact.

[NullAshton]

So Greater Weapon Spec would increase the damage by 12... Weapon Spec only increases it by 6.

When analyzing something, try to be exact.

Sorry, just generally assumed that if you got weapon specialization, you'd get greater weapon specialization too.

[Dausuul]

Last time I checked, a medium greatsword was 2d6.

D'oh! Too much Iron Heroes and people with Mighty Build. Error fixed, which puts the two closer to on par... except for the THF's advantage in feats and stats.

Now that I think about it, I also forgot to factor in Weapon Specialization. That might actually give the TWF an edge... except, again, for all the feats the TWF has already had to spend just keeping up.