The widest would probably be around 80-90% of range when your bot is in BB and opponent limps preflop, you check from BB.
e.g. on Flop Ad Td 3d, do you consider hands e.g. Jh 9h 7h 6h to be identical as Jc 9c 7c 6c? Those 2 will obviously have identical equity, so by using rules you could narrow down a lot the number of calculations.
Also flop Ad Td 3d will have identical equities as Ac Tc 3c if you just replace suits in hands.
Also whenever a hand completely missed flop, and has no draw you could approximate equity to 0, as those hands are fold vs bet, and if you want to bluff with them it doesn't matter much if they have 0% equity or e.g 15% as you bluff with them only if opponent folds really a lot.
In order to know if a hand completely missed flop, you off course need efficient implementation of hand strength. I calculate hand strength by calculating hand strength of each 2 hole card combinations of 4 hole cards. Then you can save to dictionary the strength of 2 hole cards e.g. Ks Qs and flop cards, because you will have e.g. Ks Qs appearing in so many hands, that way you speed up a lot calculations of hand strength, in fact total number of calculations for 1 Flop for all possible omaha hands is 1326 which is basically number of all possible holdem hands. Similar for calculating if a hand has a draw. You can also calculate once hand strength and draw category for each omaha hand and save to the file, so that you don't do this calculations while calculating equities.
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code.zip [14.63 KiB]