-"Ball" Chess: 9x9 board, ball on center square. 2 queens ?
-To take the ball when it's free you need to capture it.
-To take the ball when it's used, u need to take the piece.
-Goal: bring ball to final rank.
-Possibles passes : soit à une pièce, soit sur une case.
- --> remplace un déplacement de pièce. Par exemple pion a2 passe à cavalier a4 = 1 coup.
- --> selon le mode de déplacement standard (donc tout droit pour les pions)
-Pas de notion d'échec ou de mat (?)
-Si une pièce est mat elle donne le ballon (?)
+Coin Chess
+https://msoworld.com/product/chess-variants/
+Background: Unknown inventor
+Rules:
+Normal rules apply except for the introduction of a coin (or counter)
+Black starts by placing the coin on any unoccupied square. Play then continues with players alternating turns as in normal chess.
+On their turn, a player makes any legal move but may not move onto the square where the coin has been placed. The player may move over (but not onto), the coin square.
+The player ends their turn by leaving the coin where it stands or moving the coin to a different unoccupied square.
+The coin can never be placed on an occupied square, and therefore cannot be used to protect a piece from capture
+A player wins by checkmating the opponent. Note that the coin can be used to remove escape squares from the king.