Botvinnik-Markoff Extension

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The Botvinnik-Markoff Extension is an extension proposed by Sergei Markoff [1], inspired by Mikhail Botvinnik's work and publications on the program Pioneer, for instance to determine attack/defense targets for further analysis of attack/defense trajectories [2]. The extension is based on the threat move detection in null move pruning. If the threat move is the same on two consecutive plies (with one ply in between them to account for the side to move), the threat move is a serious one and the search is extended.

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