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 Originally Posted by Erpel
The chance to hit runner runner flush cards is this:
10 cards out of 47 must hit - then 9 cards out of 46 must hit. You could state this mathematically as 9/46th of 10 outs on the turn - that's 1.95 outs.
You can say that your 10 immediate outs are 'good' outs 1.95 outs of the time (to a better draw, not a made hand) and 'bad' outs 8.05 outs of the time.
No point in calculating it just to the turn, because in order to get a runner runner flush draw, you've got to go to the river.
So on the flop you evaluate your outs, all the way to the river, then on the turn you evaluate your outs all the way to the river again.
Calculating outs is an attempt to justify value with an inferior hand, there is no value in drawing to a draw.
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