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 # 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
 - **Legality filtering:** no moves that leave your own king in check.