SPR does not decide anything for you. Especially on the river.
SPR is 'stack to pot ratio' on the flop. And ONLY on the flop.
It is used to help determine pre-flop bet size. this in turn helps make post flop decisions easier and helps maximize value when you hit your hand.
On the flop, the effective stack is 4.99 and the pot is 0.37 giving an SPR of 13.5. This is a terrible SPR for AK against a small pocket pair. (Big card hands prefer an SPR of 4.5 to 6 against an average opponent). It would be difficult to get the SPR that low, because you are going to get so many folds if you are making 6x open raises... Point is that with a bad SPR for your hand, you need to exercise caution.
On the river, what you're asking about is pot odds. You're getting a little less than 3:1 to call the river raise. Our opponent does not have the nut flush since you have the K
, so you need to ask yourself whether a player would do this with a smaller flush (or worse) more that 25% of the time in order to make a call break-even. Almost certainly not, so this call is going to be -EV.
Last edited by HertzDonut; 07-29-2014 at 01:12 PM.