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'''Sibling nodes''' are the [[Node|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]] <ref>[[Jeroen Carolus]] ('''2006'''). ''Alpha-Beta with Sibling Prediction Pruning in Chess'', . Masters thesis, [http://homepages.cwi.nl/%7Epaulk/theses/Carolus.pdf pdf]</ref>, 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.