![]() Having said all of that, I think there might be a way to derive the equities for Hero and any number of Villains with random holdings without doing an exhaustive calculation, as the relationship appears to be linear (giving some leeway for the fact that my equities were generated from 600k samples on ProPokerTools): Have you tried running the same matchup multiple times on the online calculators you're using to confirm that the results are deterministic? If they are, then perhaps there's no "trick" being used, but they are just running an exhaustive calculation and just have enough processing power to achieve this - have you tried scaling your existing approach to multiple random Villains and found that the processing time is prohibitive? This obviously means you lose some accuracy - running a random (or 50% HU) hand against multiple random hands doesn't always give exactly 33.33%, 25.00% and 20.00% against 2, 3 and 4 Villains as it should for example, as you've already found based on the last sentence in your question. I expect most calculators online just run a subset of all possible boards as a representative sample - for example on ProPokerTools if you run a heads up hand against a random hand you get an exhaustive result (across 2,781,381,002,400 trials if running a random hand against a random hand - obviously less if a hand/range is specified for Hero), but if you run any hand/range against 2 or more random hands, you get a 600,000 trial sample. If we are 50% versus one random hand then against two random hands is 34% and three random hands is 21% with the calculators. I see poker calculators that do this very fast. Would I need to run combin(990,2) = 489,555? It seems like there has to be a trick to get results versus multiple random hands from knowing the value for one random hand. My question relates to matchups versus 2 random hands. If you are 50% against 1 random hand you cannot just divide by 2 and say you are 25% against 2 random hands. For each board, I run all the remaining 2 card hands combin(45,2) = 990 and just sum the wins and losses.Īgainst more than 1 random hand it get complicated though. I remove the two cards from the 52 card deck and run all the 5 card boards combin(50,5) = 2,118,760. Your two hole cards are combined with a common 5 card board to create the best 5 card hand. ![]() It works - I compared its results to a published list. I have written a program to rate 2 hole cards (your hand) against a single random hand.
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