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Seirawan chess -LRB- also SHARPER chess or S-Chess -RRB- , is a chess variant invented by American grandmaster Yasser Seirawan in 2007 .. chess variant. chess variant. grandmaster. Grandmaster ( chess ). Yasser Seirawan. Yasser Seirawan. It is played on the standard 8 × 8 board and uses two new pieces , the hawk -LRB- which moves like a knight or a bishop -RRB- and the elephant -LRB- which moves like a knight or a rook -RRB- .. hawk. archbishop ( chess ). knight. knight ( chess ). bishop. Bishop ( chess ). elephant. chancellor ( chess ). rook. Rook ( chess ). Yasser Seirawan has given simultaneous exhibitions for the game .. Yasser Seirawan. Yasser Seirawan. The first ever event was a 12 board simultaneous exhibition held March 31 , 2007 in Vancouver , Canada .. simultaneous exhibition. simultaneous exhibition