It's widely accepted in AI circles that Poker is a much more difficult to solve than chess. The main reason is that chess is a game of perfect information where

It's widely accepted in AI circles that Poker is a much more difficult to solve than chess. The main reason is that chess is a game of perfect information whereas Poker is a game of imperfect or partial information. It's much more difficult to find an optimal (or even a consistently successful) strategy in Poker.