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 Originally Posted by daven
a suggestion
you use the rule of 2 & 4 to calculate the % chance of hitting a draw based on the number of outs. you want to be comfortable converting these percentages to ratios. One way to do this is to simply write a list and keep it next to you while playing - refer to it as necessary.
If you can convert the percentages to ratios very quickly in your head, you can answer daven's question very quickly at the table.
In this specific example: you know the pot odds are 1:3 (easy to calculate, since you know the bet is 1 and the pot is 3). You can also estimate the chance of hitting your draw on the turn as 16% ~ 1:5.
Once you have those ratios, you just subtract them to find how much more you need to make from implied odds. In this case, it's (5-3) = 2 (2 times the bet you are calling, which in this case is 2x1=2).
So, basically you need to win at least $2 (approximately) from your opponent if you hit your draw in order for a call to be profitable.
It's easier than it sounds, especially since you usually see the same draws (straight draw = about 1:5, flush draw = about 1:4.5, etc.), so you eventually just instantly know the ratio rather than calculate them from a percentage.
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