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The Killer Move is a Move Ordering related issue.

The Killer Move is a quiet move which caused a beta-cutoff in a sibling Cut-node, or any other earlier branch in the tree with the same ply distance to the root. The rule of thumb is to try that move early direct after a possibly available hash move from the transposition table and considering apparently winning captures. This simple but efficient move ordering heuristic is called the Killer Heuristic. Similar to moves from the transposition table , killers may actually save the generation of quiet moves at all if it fails high, but require a legality test.

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