Game Theory: Unusual Question #3 and #4

[well]

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Because the bluff/no-fold strategy is not optimal: you need to add (the point I neglected to mention in my post, because it was so obvious) that B will fold hands below .5 that he doesn't bluff with.

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Thanks a lot. Obviously he should fold some hands.
Sometimes you just won't see you missed something in the very beginning...

I'll go on now.