Maidhc O Casain
Na Bith Mo Riocht Tá!
The sad thing is that I thought I had Iffy done right last night. In fact, I was just about sure that I did. But, hey I get that small characters have a -1 to CMB stuff, but they also have a +1 size bonus to attack. So don't these two modifiers directly offset each other?
Sort of. The -1 size modifier to Iffy's CMB offsets his +1 to attack when he's using a Combat Maneuver.
But CMs don't work against the opponent's AC, they work against a target number equal to 15 + Opponent's CMB. So if Iffy's on the receiving end of a CM, his opponent would make a regular unarmed attack roll (including the usual modifiers for size, STR, etc) and add his CMB to that. If the result equals or beats 18 (15 plus Iffy's CMB of +3) the maneuver succeeds.
Again, the full explanation is on pg. 150 of the Beta.