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Main article:The applies to (in which each move may be played by either player) and asserts that every such game has an equivalent Sprague–Grundy value, a 'nimber', which indicates the number of pieces in an equivalent position in the game of. All second-player win games have a Sprague–Grundy value of zero, though they may not be the zero game.For example, normal with two identical piles (of any size) is not the zero game, but has value 0, since it is a second-player winning situation whatever the first player plays.It is not a because first player has no winning option. References.