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One move, two threats: a fork attacks two pieces at once, and only one can be saved.

A pinned piece cannot move without exposing a more valuable one behind it.

The reverse of a pin: the valuable piece is hit first and the one behind it falls.

A piece steps aside and uncovers an attack from the piece it was blocking.

Think you know chess? Eight questions, from easy to unfair. Your score becomes a rating, and we'll tell you how many people you're ahead of.

A fresh tactic each morning, rated against the community.