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Add perft section to readme #19

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@@ -31,7 +31,7 @@ FEN is a single line string that describes a chess position. Format:
# Perft Testing A Chess Engine # Perft Testing A Chess Engine
**Perft** (“performance test”) walks the move tree *without move evaluation* and counts nodes at certain depths in the tree. It’s a standard way to verify an engine's **move generation + make/unmake (or make-on-copy)** are correct. The important to understand that the node counts have been generated and verified by the chess programming community, meaning that these counts are a reliable reference point for a chess engine to match against. **Perft** (“performance test”) walks the move tree *without move evaluation* and counts nodes at certain depths in the tree. It’s a standard way to verify an engine's **move generation + make/unmake (or make-on-copy)** are correct. It's important to understand that the node counts have been generated and verified by the chess programming community, meaning that these counts are a reliable reference point for a chess engine to match against.
## What perft checks ## What perft checks
- **Legality filtering:** no moves that leave your own king in check. - **Legality filtering:** no moves that leave your own king in check.