what are the top parallel search algorithms used by top engines ,and which one is the best ? And is there a reference implementation of them in any programming language ? I know most of the top engines are open source but they tend to be extremely complex and unsuitable for learning .

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    "This question is a bit board,…" that's the most in-character typo I have read in a while. ;-) Oct 16, 2015 at 9:03

3 Answers 3


Best performing algorithms are YBWC and DTS. Lazy SMP is probably giving best performance/complexity ratio. You can read more about parallel search algorithms here (make sure to check referencies and links. As for reference realization, I haven't seen any, so I just used simpler engines with parallel search, and, mostly, algorithms descriptions.


For most engines, this is proprietary information. However, Stockfish is quite good and is open source; its search algorithm is found here


You can read all about chess programming here.

In general, chess engines start with some form of minimax algorithm with alpha-beta pruning, then add in refinements.

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