Quote:
Stack to pot ratios, or SPRs, are defined at the flop and only the flop. They are always defined in relation to the smaller stack.
I know they wrote the book and all, but that's incredibly idiotic. The authors probably inserted that caveat because they didn't want to confuse people. For instance, I've heard that their book (I haven't read it) contains examples like "SPR of 4, stack off TP2K" or some **** like that. Without writing it again and again, they probably wanted to convey that this "SPR of 4" rule doesn't extend to when you make TP2K
on the river and somebody checkraises you. As jessyj says, there's still a stack and a pot, there's no reason why you can't talk about SPRs, and the concepts still extend (e.g. big SPRs, need a stronger hand to stackoff), even if they don't translate perfectly.
Overall, imo, SPR is just another in the long line of deeply flawed models that lose precision in favor of intuitive simplicity. You can think about "eagles" and "jackals" and "protecting your hand," and thinking about them will pull you through 25-50NL, but the fact is that these models fail to produce the most profitable decisions in many many instances.