[andyfox]

One thing to consider is how high your pocket pair is. Less risky giving a free card with kings than with tens.

I haven't played the 20-40 for a while, but when I did, there were a lot of guys who would call with just about any old thing on the flop and then give up often on the turn. When you raise pre-flop, lots of those guys put you on A-K or A-Q and will surrender if you fire a second time.

There are also quite a few players who, when you check behind on the turn, will fire at the river regardless, so you give up too much, I think, when you default fold to their river bet after it has checked through on the turn.

Here's where knowing your opponents is key. Does the big blind defend with any ace? Would he ever just check-call twice with top pair? Does he chase and/or call down with second pair? Is he an inveterate check-raiser?

In the hand in question, the board is now pretty draw-rich, so that too has to be figured in as opposed to a raggedy board without any obvious draws.