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Tablebases are databases that contain complete, exhaustively calculated moves and variations for a given collection of chess positions. E.g. the Nalimov tablebases contain full solutions for all endgames involving 6 pieces or less.

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How many legal but unreachable positions exist?

tablebases. … Here's a screenshot from the online Nalimov tablebases. Now, in this unreachable position, I can add another piece like a knight on almost every square. …
NM Wesley Falcao's user avatar