If you have a reach weapon in 1 hand (a whip) and another weapon in another hand (dagger) and someone from 2 squares away moves 1 square toward you, do you get an Attack of Opportunity?
(this is assuming they don't take a 5-foot step)
.
M= me
E= enemy
{}= space
Start:
M {} E
End:
M E {}
Similarly If you only have a reach weapon do you get the attack of opportunity?
As Oladon said, the answer to both of your questions is Yes, but only if you use a reach weapon that is capable of threatening the square in question (not a whip).
Another way to accomplish this would be a phalanx archetype fighter, since they can wield spears one handed when they have a shield (which serves as another weapon). This helps to simplify Ronin Aoi Hasu's core argument.
I think this is what you are trying to get at:(Edit-hard to do these diagrams with the forum's program. Admittedly, there would be few reasons why this kind of art would be used outside of annoyances
---E
Q X X X Q
X O O O X
X O P O X
X O O O X
Q X X X Q
If the Enemy (E), tried to go in a strait line down there, you would get up to 5 AoO (assuming you could make that many) as they exited each square (as in when he left the X square to the first O square, then from one O square to the next, then from the O to the last X, and then as he exited the last X). Your close weapon would do the AoO in adjacent squares (O), and your reach weapon would do the AoO on the outer squares (X).
Note that you do not threaten corners (Q).
Cool, thanks guys :)
Ah. Well, I got proven wrong. Cool. It did sound a bit weird that it could be done like that, espcially since it would privilege huge creatures (at least the ones with decent DEX) too much. Sorry for the mistake.
Well then, I guess going back to the original scenario, even if whips do not threaten, you could still get an AoO with the dagger if they just tried running past you. So if you focus on whips, and do not have anything to immediate to do with your other hand (casting, potions, etc.) it might be prudent to keep a dagger out.