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[[Abdallah Saffidine]], [[Nicolas Jouandeau]], and [[Tristan Cazenave]] applied race patterns and an extension of [[Proof-number searchNumber Search|Job-level Proof-number search]] to solve Breakthrough on up to '''6x5''' boards <ref>[[Abdallah Saffidine]], [[Nicolas Jouandeau]], [[Tristan Cazenave]] ('''2011'''). ''Solving breakthrough with Race Patterns and Job-Level Proof Number Search''. [[Advances in Computer Games 13]], [http://www.lamsade.dauphine.fr/~cazenave/papers/solving.pdf pdf]</ref>.