Is checking out "unethical"?

[TakeMeToTheRiver]

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OK. One simple example. Three players in the pot. Player A checks, player B checks because he cant bluff against two players, C checks too and shows a winning hand. Now if player A folds, its more easier to player B to bet, because he knows for sure that player A isnt going to call/raise. Now player C is in a bad spot. Player C decides not to call. What happend? Player C lost a pot he would have won, if Player A had checked instead of folding.

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That's an effect of a legitimate action not an explanation of why the action is unethical.

Remember -- Player A does not know what the effect of his checking out will be. When he checks out, it can also make it easier for Player B to bet into what he sees as a weak Player C even though Player B would not have bet into two players. If Player C folds the best hand, Player A's check out helped Player B. Every action by a player has the potential of affecting the actions of other players. It does not make those actions inappropriate or unethical.