
Ai N. Stein |

It says on both of these that "If the target has more than two legs,
add +2 to the DC of the combat maneuver attack roll for each
additional leg it has." for both rules on page 201 of the core Pathfinder book.
Situation: A horse trying to overrun or trip another horse.
Would the horse attempting the combat maneuver effectively be at a -4 penalty, or would the fact that both of them have 4 legs cancel out? It would make sense to me in this particular instance that overrunning horse to horse would be without penalty, and the trip with, but I would like an official ruling on the subject please. There is a character build at stake here.

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In my view, the fact that the creature attempting the overrun or trip has 4 legs doesn't cancel out the fact that the creature being overrun or tripped also has 4 legs.
The added stability makes it tougher for someone to trip you. That doesn't necessarily translate into having a better chance of tripping someone else.
Although there are cases in the rules where an additional limb or appendage does grant bonuses to CMB, they are explicitly stated in a creature's description and those cases usually apply to grappling, not overrun or tripping attempts.

Ai N. Stein |

In my view, the fact that the creature attempting the overrun or trip has 4 legs doesn't cancel out the fact that the creature being overrun or tripped also has 4 legs.
The added stability makes it tougher for someone to trip you. That doesn't necessarily translate into having a better chance of tripping someone else.
Although there are cases in the rules where an additional limb or appendage does grant bonuses to CMB, they are explicitly stated in a creature's description and those cases usually apply to grappling, not overrun or tripping attempts.
Thank you very much, although the rules/ruling on this particular subject are (I feel) kinda suck-y. Perhaps it would have been better to say "The target adds +2 DC for each additional leg more than the attacker he has, and -2 for each leg less." That would make sense to me. Or "The target adds +2 DC for each leg up he has..." XD