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Sibling nodes are the nodes with a common ancestor, differing only by the position of one or at most two pieces. Some heuristics, most notably the Killer Heuristic and Sibling Prediction Pruning [1], rely on the assumption that the positions from the sibling nodes are similar to each other and ought to trigger the same behavior of a program.


  1. ^ Jeroen W.T. Carolus (2006). Alpha-Beta with Sibling Prediction Pruning in Chess, Masters thesis, pdf

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