What is U-grid chess? I can't find anything about it.
PS: not to mention random permutation chess. After every turn of every player, a random permutation of all 64 squares is generated and the pieces are rearranged according to it. King rule effective, checkmate is loss, if player to move attacks opponents king, they may not capture it. No double move, e.p., promotion or castling. Absolute chaos, but still not totally without strategy, one can still decide if and which piece to capture, while all non-capturing moves are effectively the same since everything is randomly rearranged.
What is U-grid chess? I can't find anything about it.
PS: not to mention random permutation chess. After every turn of every player, a random permutation of all 64 squares is generated and the pieces are rearranged according to it. King rule effective, checkmate is loss, if player to move attacks opponents king, they may not capture it. No double move, e.p., promotion or castling. Absolute chaos, but still not totally without strategy, one can still decide if and which piece to capture, while all non-capturing moves are effectively the same since everything is randomly rearranged.