One of the main similarities between the two games is undoubtedly that one of the most important components is strategy. In both poker and chess, the game of every hand and every move is the result of careful analysis, and although it may sometimes seem that these decisions are taken lightly, the truth is that this is not the case.
Both games have incredible mathematical calculations, which are not seen with the naked eye. There are Artificial Intelligence Programs, both in Chess and in Poker, that have beaten Elite players.
Computers can do mathematical calculations and probabilities in moments, something that human beings cannot do. That's when we realize that by having strategies and making calculations, they make certain players so successful that they are always at the top. Like Daniel Negreanu, Justin Bonomo, Eric Seidel, to name a few.