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Implement multithreaded search using Lazy SMP - #52
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…le UCI Threads Add worker-local search instances with staggered iterative deepening, striped TT locks, aggregated node accounting, cooperative stop/join, isolated helper UCI output, MultiPV support, and threading regression tests. Keep IIR outside main.
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Summary
Threadsoption (1–64, default 1)bestmoveSafety
mainValidation
Build and CTest on Linux/Windows CI; compare SPRT and NPS before merging. Threads=1 retains the single-worker behavior.