The bad news is that this is a huge field of study.

The good news is that you have just identified a subject matter that you know you need to gain a better understanding of, AND it is totally do-able. Is my assumption correct? Not that 98s should ever be calling cold-3bets like this - just that ATs seems even worse because of reverse implied odds in a deep-stacked situation. In addition, how does the effective stack change the strategy here? Was his decision better or worse based on it being 250bb deep rather than the standard 100bb? I have a feeling it was worse because of reverse implied odds, and that something like 98s would honestly be a better cold-call than ATs here, whereas ATs might be a better call at 100bb than 98s would be. In general, was his pre-flop decision a mistake? What hands are good enough to cold-call a 3-bet, or should we always be 4-betting or folding when facing a cold-3bet? I couldn't help but think that I might have made the same pre-flop decision, though. Long story short, the LJ lost his entire $500 stack after he hit TPTK and I had an overpair. Postflop strategies are solved on all kinds of existing flops, at high accuracy, using the Simple Postflop GTO solver.1/2 deep-stacked (~$500 effective stacks).

The preflop strategy was calculated for a chipEV environment (excluding rake), since the rake is extremely low at high limits. Preflop strategies were calculated using Simple Preflop Holdem with the most advanced bucketing (10k/100k/100k of buckets per postflop street) over a very large number of iterations. In the era of such matches as Doug Polk vs Daniel Negreanu, Limitless vs Stefan11222, Limitless vs Fedor Holz, Daniel Negreanu vs Phil Hellmuth, Simple Poker has prepared a gift especially for the community – calculated strategies for HU Cash 50-100bb, both preflop and postflop! The format of HU matches has always been, is and will remain popular in poker among players who have decided to measure their skills and show who is the king of the game.

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