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Back Door Flush, RamDannyboy, 21. Jun 2003 04:32
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I've often read in poker literature that a back door flush is worth 2 outs.

How is that calculated?
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I'm not sure, but I think..., Easy E, 21. Jun 2003 19:12
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...that it's meant to use as a tool to add to your more "normal" outs, so that some hands which normally wouldn't be a call will become eligible for one because of the backdoor draws.

Without more information, I'm assuming that they were referring to the 2 extra outs in a particular situation.
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Re: Back Door Flush, Andrew Wells, 22. Jun 2003 01:57
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If I'm in a situation where I need to count outs on the flop and compare that to the pot size plus expected action, I figure a backdoor flush as one extra out not two.
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Re: Back Door Flush, stdioh, 23. Jun 2003 10:51
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Your chance of making a backdoor flush is about the same as the chance of having an underpair and hitting a set. In other words, it could sweeten the value of a marginal holding, but it isn't something you can chase.

For example, if you are holding AsKs and the flop is 2s8dTc then you are drawing to 6 outs for top pair top kicker, but the fact that you have a backdoor nut flush draw makes this slightly sweeter and you can essentially play it as if you have 8 outs ... of course your chance of winning when you hit an ace or king is very much reduced and that must be taken into consideration, but the point here is that you've got and extra shot at winning.

Perhaps a better example would be the following. Lets say you have Ad6d and the flop is 2d6sQc. Now if you hit another 6 you are probably good and if you hit an ace you are probably good and if you hit the backdoor nut flush then you are probably good (unless the board pairs and you get very unlucky) ... so now you have 6 outs plus the backdoor flush draw making it act like 8 outs. Thus you can be convinced to call a bet on the flop based on the pot odds for 8 outs and then cancel 2 of your outs on the turn if no diamond comes. Of course if a diamond does come then you get to add yourself 7 outs.
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