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lc3 Search

lc3 is a new experimental search algorithm implementation currently in development for Leela Chess Zero.

The design decisions are pretty much in flux, as of 2025-07-13. The initial implementation contains number of speculative performance optimizations. The idea is to undo optimizations later when we have a way to measure performance.

Overview of the lc3 search algorithm
What is a search policy
Summary of terms and the data types used in lc3 search