Masonic chess

[1][2] The game is played on a modified chessboard whereby even-numbered ranks are indented to the right—resembling masonry brickwork.

The moves of the pieces are adapted to the new geometry; in other respects the game is the same as chess.

[3] The Masonic board cells are slightly rectangular, and indentation of alternating ranks results in cants (oblique files) 30° from the vertical and diagonals 30° from the horizontal, the same as hexagon-based chessboards when cell vertices face the players.

Masonic bishops, however, are limited to the four diagonal directions to the sides.)

All normal chess rules apply, including conventions for castling either kingside or queenside, a pawn's initial two-step option, en passant captures, promotion, and so on, but the pieces have specially defined moves.