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If I understand the betting right, calling is +EV if you think there is at least a 30% chance he has junk that you beat.
Lets work in whole numbers for simplicity. Blinds 1/2, limpers bet 2, 2, 2, SB folds, Hero raises 8 to 10, limper folds, Villian calls, limper folds. Pot is 25, Hero bets 20. Villian raises 45 to 65 and is all-in. Pot is now 110, Hero is getting 2.5 to 1 to call 45.
Ignoring the possibility of him having two pair and you hitting your kicker to win, looking at this strictly from a "he has it" or "he doesn't" standpoint.
If you call.....
If he has it, you lose 45
If he doesn't, you gain 110
If he has 2 pair or better 70% of the time, and Ax/pp junk 30% of the time, the equation looks like this
(0.30 * 110) + (0.70 * -45) = 33 - 31.5 = +1.5
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