It’s worth noting that in blindfold chess, you by definition don’t see the board state, only the history (if you can remember it), and whether you played a legal move. It has a sort of mirror or dual game in the form of Kriegspiel, you can see your pieces but not the enemy’s moves/history, and you again can try to play moves and will be told if they are legal or not (and you are expected to ‘probe’ with possible moves to gain information from the legality thereof). This demonstrates that human players can play satisfying chess with not much more than legality plus some additional information. (It would be interesting to see if with enough practice, humans could play ‘blindfold Kriegspiel’ reasonably well or if that winds up being too difficult.)
It becomes a probabilistic chess game rather than an expansion of the existing chess game. When you can see the pieces yourself, you don’t have to solve the probabilistic problem. Reducing complexity is a strategy in and of itself. Now you have to weigh whether you want to focus on getting better probabilities, and whether that gets in the way of regular chess strategies.
It’s worth noting that in blindfold chess, you by definition don’t see the board state, only the history (if you can remember it), and whether you played a legal move. It has a sort of mirror or dual game in the form of Kriegspiel, you can see your pieces but not the enemy’s moves/history, and you again can try to play moves and will be told if they are legal or not (and you are expected to ‘probe’ with possible moves to gain information from the legality thereof). This demonstrates that human players can play satisfying chess with not much more than legality plus some additional information. (It would be interesting to see if with enough practice, humans could play ‘blindfold Kriegspiel’ reasonably well or if that winds up being too difficult.)
It becomes a probabilistic chess game rather than an expansion of the existing chess game. When you can see the pieces yourself, you don’t have to solve the probabilistic problem. Reducing complexity is a strategy in and of itself. Now you have to weigh whether you want to focus on getting better probabilities, and whether that gets in the way of regular chess strategies.