The imperfect play is in the mixing. Imagine you play like optimal but every time you have a mixed action of bluff or check you bluff. You won't be exploited by

The imperfect play is in the mixing. Imagine you play like optimal but every time you have a mixed action of bluff or check you bluff. You won't be exploited by an optimal strategy but you will be very vulnerable vs someone who bluff catches a lot.