[Jeff76]

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I was thinking SPR just helps us 'maximize'.

[/ QUOTE ]SPR helps us manage our risk vs reward. We are willing to put in 4.5x the pot on this flop because we believe villain will put this much in with a weaker range than our hand (though some of this range likely includes bluffing hands).

If the SPR were 10, there is now twice as much at risk for what we are fighting over, and now villain will tend to have better hands when all the chips get in the middle (because the risk/reward ratio has changed for him as well). Since now we will probably be behind villain's range when all the chips get in, we do not want to commit.

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It seems in this hand I felt I either had to go all the way or fold the flop, otherwise I put in too much and then fold.

[/ QUOTE ]I agree that against this villain you should be willing to commit to going all the way (and SPR tells us that); however, I think our commitment should be conditional to villain betting into us, as that means we gain equity from picking off his bluffs. Villain has a predictable tendency, and that is the only reason we should be willing to commit here. If we didn't know villain had this tendency, our hand is way too marginal to commit with.