Lazy SMP

Last updated May 07, 2025

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In combinatorial game theory, Lazy SMP is a parallelization technique for tree searching by launching the various depths used in iterative deepening on their respective threads (the technique used by Stockfish ^[1]^[2]). Combined with a concurrent transposition table, the non-determinism of these threads leads to speed gains when different depths encounter games already searched by other threads. Lazy SMP was described, but not discovered, by Daniel Homan in a chess form.^[3]

References

↑ "What is depth? - Stockfish FAQ". Stockfish Documentation.
↑ "Stockfish 7". Stockfish.
↑ Østensen, Emil. "A Complete Chess Engine Parallelized Using Lazy SMP" (PDF). Universitetet I Oslo.

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Definitions	Congestion game Cooperative game Determinacy Escalation of commitment Extensive-form game First-player and second-player win Game complexity Graphical game Hierarchy of beliefs Information set Normal-form game Perfect recall Preference Sequential game Simultaneous game Simultaneous action selection Solved game Succinct game Mechanism design
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Key figures	Albert W. Tucker Amos Tversky Antoine Augustin Cournot Ariel Rubinstein Claude Shannon Daniel Kahneman David K. Levine David M. Kreps Donald B. Gillies Drew Fudenberg Eric Maskin Harold W. Kuhn Herbert Simon Hervé Moulin John Conway Jean Tirole Jean-François Mertens Jennifer Tour Chayes John Harsanyi John Maynard Smith John Nash John von Neumann Kenneth Arrow Kenneth Binmore Leonid Hurwicz Lloyd Shapley Melvin Dresher Merrill M. Flood Olga Bondareva Oskar Morgenstern Paul Milgrom Peyton Young Reinhard Selten Robert Axelrod Robert Aumann Robert B. Wilson Roger Myerson Samuel Bowles Suzanne Scotchmer Thomas Schelling William Vickrey
Search optimizations	Alpha–beta pruning Aspiration window Principal variation search max^n algorithm Paranoid algorithm Lazy SMP
Miscellaneous	Bounded rationality Combinatorial game theory Confrontation analysis Coopetition Evolutionary game theory Glossary of game theory List of game theorists List of games in game theory No-win situation Topological game Tragedy of the commons

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Lazy SMP

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