I must be doing something wrong...

EV of a call = -1.64 and Villian is only calling with 9 hands.

Meaning if we add only one hand to our opponents range, he's folding Calling 9/10 times for an ev of -1.64, but that tenth time, he's folding, and we win 20 for better than break even odds. This situation only gets sweeter, as we realize he's opening WAY more hands.

I don't see why Daviddem is suggesting opponent has to fold 1/3rd of the time. Unless he means 1/3rd of 1 hand.

Implications for balance? In this situation, opponent is calling way too tight, so you should be shoving all the time. Also: As opponent tries to adjust once he's seen your capable of this, adding your own hands to the mix such as 2pair and sets, means he's calling in situations where he's hopeless.

Basically if you have a set, or 2pair, you can also shove those in this spot which your opponent will be more likely to call, because he's seen you go into hypermode with a gutshot flushdraw.

Also: This seems to suggest that 4.5x the pot is a pretty serious number to have committed to memory when it comes to GSFD's.