The basic movement for each piece is the same as traditional chess.
Pieces are never removed from the board. Instead, the capturing piece shares the square with the captured piece, and the two pieces become a joined pair.
When either piece moves from a square containing two pieces, the other piece moves with it. Each player can only move a joined pair according to the rules for their own piece. Joined pieces cannot capture other pieces.
A free (non-joined) piece may move into a square occupied by pieces of both colors. When it does, the other piece of the same color becomes a free piece and must move to a new location following the normal movement rules. This process may be repeated multiple times in the same turn.
Ŝako (checkmate) occurs when an opposing piece joins with the king. Important: The king is not permitted to join with (capture) other pieces.
Due to joined movement, it is possible for a pawn to be moved backward to, or past, its starting row. Pawns may move forward two spaces from either of the first two rows on their own side of the board.
When a pawn is captured en passant while joined with another piece, the captured pawn moves back one square to become joined with the capturing pawn and the joined piece from the capturing side moves to a new location from its original position as with any other capture.
Pawns are promoted when they reach the final row on the opposite side of the board, even if they were moved there by the other player as part of a joined pair.