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View Full Version : ev wrong in 3+handed situations with shorty



Hratch
08-21-2009, 12:02 AM
Say there are 3 players, two with $100 stacks, one with a $20 stack. If the $20 stack is allin on the flop, and let's say one of the other $100 stacks folds on the turn, then the ev of the shorty should be calculated with his equity on the flop (he went allin on the flop), not on the turn! (the turn equity is used now).

fozzy71
08-21-2009, 09:08 AM
Your EV is calculated from the Turn because that is the spot where everyone left in the hand is all-in. There is no way to know your all-in % from an earlier street since some players in the hand at that point did not show their cards

Hratch
08-22-2009, 04:27 PM
Your EV is calculated from the Turn because that is the spot where everyone left in the hand is all-in. There is no way to know your all-in % from an earlier street since some players in the hand at that point did not show their cards

The problem is that the shorty went allin on the flop (not turn).

The best way to do this is to calculate the equity of each player in the pot on the street he goes allin. For example, say we are 3, and the shorty's allin on flop, and the other 2 are allin on turn. First, the flop side pot (with the shorty) is considered, and each one's equity is calculated on the flop. Then on the turn, the remaining pot is considered and the other 2's equity is calculated on the turn. So for the shorty, his ev=hisFlopEquity*flopSidepot, while for each the other 2, their ev=theirFlopEquity*flopSidepot + theirTurnEquity*remainingPot.

Rvg72
08-23-2009, 12:20 AM
Doing it the way you suggest creates all sorts of selection bias issues which would crate completely invalid EV results since there was an additional player on the flop that is no longer in the hand and you have no idea what his cards are.

Roy