Items Invented by Donald irvin Gebhart
- TriChess . is a hexogonal, three player variant, created and distributed by PrimeChess Oy. Inventor: Donald irvin Gebhart.
- Imperial Chess I. Four-player game on circular board, also called Chez. Author: Ed Friedlander. Inventor: Donald irvin Gebhart.
- TriChezz. Chess for three on a circular board. Classic proprietary game. Author: Ed Friedlander. Inventor: Donald irvin Gebhart.