ONE BRILLIANT MOMENT
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Paul Morphy vs Louis Paulsen · 1857 · move 18.
Which knight check uses the square f6?
Morphy and Paulsen reach a sharp Sicilian with queens pointed at opposite kings. White establishes a knight on f6, then changes the material balance through captures on c6 and c8. The resulting rook-and-minor-piece play makes this a useful exercise in reassessing an attack after the queens disappear.
Before reaching for a move, identify the opponent’s immediate threat and the piece you most want to improve. Then compare checks, captures and quiet moves. The complete interactive lesson will let you test your answer without revealing the historical continuation first.
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