The Rules of Chess when playing against a Blind Player.
Wikipedia explains the rules as follows (link)
Although most of the rules in blind chess are consistent with normal chess, there are a few modifications to the equipment to allow the blind and visually impaired to compete:
All the black squares are raised about 3–4 mm above the white squares on the chessboard. By feeling the squares, the player is able to determine whether the square is a black or a white one.
Each of the squares on the board has a hole in the center so that the chess pieces can be fixed in these holes.
Each of the pieces has a downward projection (nail) at the base, which fits into the hole in the squares on the board, thereby fixing the piece securely on the board.
All the black pieces have a pin fixed on their heads helping the player distinguish between a white and a black piece.
After making every move, each player is required to announce their move aloud to their opponent. Instead of writing the moves on a chess score sheet, the visually impaired player writes the moves in Braille or records the moves on a tape recorder.