I specialized in heads-up no-limit (HUNL) when I played. With cash games, no-limit head-up holdem is arguably an unsolvable game - whereas limit holdem is already solved. No limit multi-handed (more than 2 players) is solveable but only in theory (thus far). It may seem counter-intuitive that less players (less hands) could equate to more variations but heads-up (2 players) introduces a variable thats extremely difficult to quantify: we call this "meta"; (meta game can and will be present multi-handed, but to much a smaller extent, and most often at-play in "heads-up" situations within multi-handed play) the "psyche" part of poker. Meta isn't so much John Malcovich dissecting an Oreo cookie because he's bluffing - much is intangible, but as hands are played, either player is contributing to the context.

History of how hands were played, what you know about your opponent, what you know your opponent knows about you, what you know that your opponent expects you to do in a given situation.. all that stuff comes to focus in HUNL.

Anyway, that got a bit wordy but I hope that you can see why I am super curious to see some application / testing of LLM in the specific HUNL format. Thanks for reading