Items Invented by Karl Scherer
Black Hole Chess. Pieces moved to the center four squares of the board fall into your hand. Author: Ed Friedlander. Inventor: Karl Scherer.
- Hermit Chess. Play vs opponent making increasing numbers of random moves. Author: Ed Friedlander. Inventor: Karl Scherer.
- Magic Carpet Chess. Each player has a magic carpet to move a non-King to any empty square on the board. Author: Ed Friedlander. Inventor: Denis van Straten and Karl Scherer.
- River Chess. Win by getting a piece to the opposite side. Author: Ed Friedlander. Inventor: Karl Scherer.
Bank Chess. Regular Chess only Drops come from Pocketings. Author: Jeremy Gabriel Good. Inventor: Karl Scherer.
Bank Chess 
. Put your assets on the bank for later use! 6 Variants. Author: Karl Scherer. Inventor: Karl Scherer and Denis van Straten.
- Changling Chess
. Rooks become Bishops and Bishops become Rooks when moved. By Karl Scherer.
- Hydra Chess . Captured pieces return. Regrown pieces will be of lesser value. By Karl Scherer.
- Island Chess. Some connections between squares are missing. By Karl Scherer.
- Karma Chess . A piece that has captured an opponent's piece is turned into one of better quality. By Karl Scherer.
- River Chess . Get one of your pieces to the other side of the board. By Karl Scherer.