Why it matters

Transposition tables save massive work. Foundation for game engines.

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The architecture

Hash position via Zobrist.

Store depth + eval + move.

Retrieve on revisit.

Transposition table flowHash positionZobrist keyStore entrydepth + eval + moveRetrieveon revisitReplacement: depth-preferred or always-replace; size millions of entries
Transposition.
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How it works end to end

Depth-preferred replacement.

Best move first: move ordering.

Cutoffs: use exact bounds vs lower/upper.