Falcon-hunter chess

Falcon-hunter chess is a chess variant devised by Karl Schultz in 1943. It keeps the full rules, board and starting position of standard chess and adds two fairy chess pieces, the falcon and the hunter, which begin the game off the board. The falcon moves forward like a bishop and backward like a rook, while the hunter does the reverse, moving forward like a rook and backward like a bishop; neither can travel along a rank, and both capture as they move. A player may bring one of these pieces onto an empty square of the home rank once a queen, rook, bishop or knight has been lost or exchanged, and the second piece becomes available after a second such loss. The game is also known as Schultz's chess, one-way chess and meso chess. Recorded variations include versions in which the pieces arrive only by pawn promotion, a 66-square form, the renamed hunter chess of the 1950s, and decimal falcon-hunter chess on a ten by ten board.