Tennis a new point. A game consists of a sequence of points played with the same player serving. A game is won by the first player to have won at least four points in total and at least two points more than the opponent. The running score of each game is described in a manner peculiar to tennis: scores from zero to three points are described as ""love"", ""15"", ""30"", and ""40"", respectively. If at least three points have been scored by each player, making the player's scores equal at 40 apiece, the score is not called out as "40-40", but
Zero game piles or a Hackenbush diagram with nothing drawn on it. The Sprague–Grundy theorem applies to impartial games (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 nim. All second-player win games have a Sprague–Grundy value of zero, though they may not be the zero game. For example, normal Nim with two identical piles (of any size) is not the zero game, but has value 0, since it is a second-player winning situation