- Setup. 8×8 board. Back rank: Ruea, Ma, Khon, Met (queen), King, Khon, Ma, Ruea. Bia (pawns) start on the 3rd rank (one closer than chess).
- King. One step in any direction.
- Met (♕). ONE step diagonally only — much weaker than the chess queen.
- Khon (♗). One step diagonally OR one step straight forward.
- Ma (♘). Knight L-shape, jumps over other pieces.
- Ruea (♖). Any distance orthogonally, blocked by pieces.
- Bia (♙). Pawn — one step forward, captures diagonally. No double-step; no en passant. Promotes to Met when reaching the 6th rank from its own side.
- Win. Checkmate. Stalemate is a draw.