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Strange Play in a Four-Bet Pot

note: cross posted from Andrew's blog at http://www.thinkingpoker.net/Blog/

Here's a pretty interesting spot where I made what might be called a pre-emptive blocking bet:

Full Tilt Poker, $5/$10 NL Hold'em Cash Game, 6 Players

SB: $2,184
BB: $2,000
UTG: $1,000
MP: $1,000
CO: $2,413
Hero (BTN): $4,150

Pre-Flop: Kd Kh dealt to Hero (BTN)
2 folds, CO raises to $35, Hero raises to $120, 2 folds, CO raises to $320, Hero calls $200

Flop: ($655) Ah Td 6h (2 Players)
CO checks, Hero bets $333, CO folds

Results: $655 Pot ($3 Rake)
Hero mucked Kd Kh and WON $652 (+$332 NET)

First off, let me cover the pre-flop. CO was a decent regular, definitely capable of 4-betting light. However, we didn't have a sufficiently aggressive history that I could expect to get action if I 5-bet him. Calling is very clearly best, then, to maintain some deception about my range.

When he checks the flop as the pre-flop aggressor, I'm putting him on one of three things, from least to most likely:

1) A slowplayed monster- With AA, this is definitely a good time to check; however, that's a small part of his range, checking with TT is a lot less good (because I could well have top pair), and it's not a guarantee he would do it;

2) Air that is giving up- I'd expect him to fire once when an Ace flops if he has nothing, but then again people do tend to play pretty straight-forwardly in 4-bet pots;

3) An underpair playing for pot control- With QQ or JJ, he's definitely checking this flop to show down cheaply and induce bluffs.

4) Top pair playing for pot control/value- With something like AJ, he has a very strong hand that still probably does not want to play for stacks. By checking the flop, he can try to keep the pot smaller, induce bluffs, and get value on a later street from hands that might fold to a flop bet.

This may seem like a bad bet, then. After all, I'm only expecting a narrow category of worse hands to call, and overall I'm expecting to be behind his calling range. I do think I should have bet a little less, but in all likelihood, I'm going to have to pay off at least one bet to hands that are beating me anyway. Unless he does something crazy like overbet shove, I'm going to call at least one street. I think that betting now is the best way to get value from the occasional underpair, as a bet on a later street is going to look stronger than a flop stab.

Plus, this lets me control the size of the bet that I pay off to his Ax and deter the occasional double barrel bluff that I can't pay off. If he check-calls the flop, I'll be very comfortable folding if he leads out on the turn, or if he leads out on the river after the turn checks through. However, if I check now, I'd probably call the turn and fold the river. That means I'd pay off a turn bet of like $450-$500, often to Ax, and then fold to a river bet, which might occasionally be a bluff.

In looking over this now, I think I could accomplish all of this with a slightly smaller bet, probably in the $250-$300 range. But nevertheless, I think it's an interesting spot where position and narrowly defined ranges in a 4-bet pot greatly influence my play.