g. Ngf3 implies "knight from your g-file moves on the square f3"; R1e2 means "rook on the very first rank moves to e2"). For pawns, no letter First is utilized; so e4 means "pawn moves on the sq. e4".In 1913, Ernst Zermelo utilized chess like a basis for his idea of video game approaches, which is considered among the predecessors of sport idea.[14