Pathfinder 1st Edition · Trade accuracy for extra melee damage.
With Power Attack
Melee attack & CMB penalty
Extra damage per hit
First attack bonus
New damage modifier
First attack penalty: . Other attacks: using the entered attack bonus, before any iterative or other attack-specific penalties.
Furious Focus removes the penalty only for your first attack each turn with a weapon wielded in two hands. Later attacks and attacks of opportunity retain the penalty.