Items Invented by Philip M. Cohen
- Nemesis Chess. Some pawns are replaced by the Nemesis, which moves only toward the enemy king and cannot be captured by pawns or kings. Author: Ben M Reiniger. Inventor: Philip M. Cohen.
- Null chess. Capture squares are destroyed when vacated. Author: Ben M Reiniger. Inventor: Philip M. Cohen.
- Tutti-Frutti Chess. With bishop-knight, knight-rook, queen-knight and the usual pieces on an 8 by 8 board. (8x8, Cells: 64) Author: Hans L. Bodlaender. Inventor: Ralph Betza and Philip M. Cohen.
- Archimedes Chess. Capture by attacking an enemy unit with two of yours. Author: Ed Friedlander. Inventor: Philip M. Cohen.
- Blood Brothers Chess. Pieces defend others of their kind regardless of location. Author: Ed Friedlander. Inventor: Philip M. Cohen and R. Wayne Schmittberger.
- Nemesis Chess. Missing description Author: Ed Friedlander. Inventor: Philip M. Cohen.
- Nine Riders Chess. Each piece is a rider. Author: Ed Friedlander. Inventor: Philip M. Cohen.
- Null Chess. Squares on which captures have taken place can no longer be visited. Author: Ed Friedlander. Inventor: Philip M. Cohen.
- Tutti-Frutti Chess. Play this variant in which compounds replace some standard Chess pieces on Jocly. Author: Michel Gutierrez and Jean-Louis Cazaux. Inventor: Ralph Betza and Philip M. Cohen.
- Tutti-Frutti Chess. With bishop-knight, knight-rook, queen-knight and the usual pieces on an 8 by 8 board. Author: Jeremy Gabriel Good. Inventor: Ralph Betza and Philip M. Cohen.