Tavreli: Russian Chess

1. Pieces move as in ordinary chess, including castling and en passant.
2. A capturing piece stands on top of the captured one, forming a tower.
3. A tower moves like its top piece, and on its turn it can split into two.
4. No piece may be placed on the Magus (king).
5. Checkmate the opponent's Magus to win.

Tavreli: Russian Chess plays by the rules of ordinary chess — castling and en passant included — with one twist that changes everything: pieces are never taken off the board. A capturing piece climbs on top of its victim, building a tower that moves according to whichever piece is on top, and captured pieces can be freed again later in the game. You can even stack your own pieces into towers, and on its turn a tower can split into two parts. Because nothing ever leaves the board, a material lead is never safe, and every capture has to be weighed against the chance of it being undone. You win by checkmating the opponent's Magus (the king). Play the computer, a friend on one device or an opponent online.