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I don't understand why the turn check is bad. He can have ten outs against me and I don't think its bad, because regardless hes most likely putting in another bet on the river(hit or miss) and I'm not betting the river if he calls the turn. I also don't want to be moved off the best hand.

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Bluff turn checkraises are uncommon, even at 10/20. If he's checkraising the turn here usually he's got a good hand or a BIIIIIIIIG draw (T8s) as an unknown. But most people go more bets with those on the flop anyway.

You also don't know (or haven't stated) that he's prone to either bluffing the river after a check (some will, some won't -- especially since a turn check looks like A-high inducing a bluff), so more often than not you're losing the pot when you check and he hits but aren't gaining a full bet when he misses.

Rob