This situation happens a lot. One fish playing 50/5 or something like that limps, I have AK and raise to 4BB, everybody folds and the fish call OOP.
Flop is something like 57T rainbow, I make a cbet of 2/3 pot, he calls OOP. Turn is a 2 and I check behind, noticing that he has WTSD 40%, so I assume he is most likely calling me with any pair he's hit. Now the river is a Q, so no flushes and no straights are complete. The pot is something like 20BB and he donks 4BB into it. Now it is very clear he is blocking me and he is affraid I may have hit that Q.
The question is, how frequently should you bluff in a spot like this, and what is the threshhold of his WTSD to make me just give up. I've seen fish block like that and then call overbets with one pair, I've also seen folds. Suppose we have a decent sample on the fish, so the WTSD is relevant.
I'm expecting answers like: "I'd raise to 20BB if his WTSD is lower than 30" or, "I'll just give up if his WTSD is higher than 45", or "I'd raise to 15BB if his WTSD is lower than 25".
I'm really looking forward on your thoughts about this.