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Originally Posted by seven-deuce
Only when the equity is really low. With only 2 outs, or 4% per draw, the approximation holds pretty true. When it gets close to or over 50%, then the approximation fails badly.
Like, AK vs QQ is close to 48% vs 52% equity, respectively, but if you try to use the approximation of 2% per out per draw, you'd come up with 6*2%*5 = 60% equity for AK, instead of 48%.
Originally Posted by daviddem
Rule of 2 and 4 is good for the flop and turn you can't really extend it to preflop.
You need to refine the rule of 4 a bit when you have lots of outs. For more than 8 outs, mutliply by 4 and then subtract the number of outs beyond 8. So if you have 12 outs otf, that's 4 outs beyond 8 and you have about
12*4 - 4 = 48 - 4 = 44% equity.
Agreed, severely limited use pre.
Just because I can't stress it enough: the rule of 4 only applies to all-in calls OTF. Otherwise, you should use the rule of 2 OTF as well.
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