Combat Intuition

 
Prerequisite(s): Sense Motive 4+ ranks, Base Attack Bonus 5+
 
Benefit: As a free action, you can use your sense motive to assess the challenge of a single opponent in relation to your own lvl/HD. You gain a +4 bonus to these checks and can narrow the results down to within one level. In addition for any creature that you have attacked during the previous round, you gain a +1 bonus to attack rolls.
 
Source: Complete Adventurer