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A variation can be any number of steps as long as each step would be legal if it were to be played. It is often as far ahead as a human or computer can calculate; or however long is necessary to reach a particular position of interest. It may also lead to a terminal state in the game, in which case
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The principal variation refers to the particular variation that is the most advantageous to the current player, assuming each other player will respond with the move that best improves their own position. In other words, it is the "best" or "correct" line of play. In the context of
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can refer to a specific sequence of successive moves in a turn-based game, often used to specify a hypothetical future state of a game that is being played. Although the term is most commonly used in the context of
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to be the most advantageous, but is not guaranteed due to the technical limitations of the algorithm.
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analysis, it has been applied to other games. It also is a useful term used when describing computer
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the term "winning variation" or "losing variation" is sometimes used.
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138:"Searches, tree pruning and tree ordering in Go"
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16:A specific sequence of moves in a game
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60:The principal variation of this
32:-search algorithms (for example
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169:Game artificial intelligence
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164:Combinatorial game theory
78:artificial intelligence
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184:Trees (graph theory)
140:. 21 December 2007.
52:Principal variation
114:Alpha-beta pruning
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174:Search algorithms
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76:-searching game
67:is shown in blue
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179:Computer chess
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99:Backtracking
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158:Categories
149:Variations
125:References
119:Negascout
94:Game tree
65:game tree
21:variation
88:See also
82:believed
109:Negamax
104:Minimax
62:minimax
34:minimax
42:Chess
26:Chess
74:tree
30:tree
40:or
160::
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38:Go
19:A
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