Items Invented by Yasser Seirawan
Seirawan Chess. invented by GM Yasser Seirawan, a conservative drop chess (zrf available). Author: M Winther. Inventor: Yasser Seirawan and Bruce Harper.
Seirawan Chess. It's Chess with the option to drop some additional pieces on the board. (8x8, Cells: 64) Author: Fergus Duniho. Inventor: Yasser Seirawan and Bruce Harper.
Seirawan Chess. FIDE chess, put players have N+R and N+B in hand to drop. Inventor: Yasser Seirawan and Bruce Harper.