In chess, a "brilliancy" is an extremely strong move, often an unexpected or atypical move, which drastically improves a player's situation in a single move.

In chess notation, a move considered to be a "brilliancy" is typically marked with a double exclamation points (!!) after the move notation.

Players who play a game with one or more brilliancies in a tournament often win a special commendation called a "brilliancy prize."

Bril"lian*cy (?), n. [See Brilliant.]

The quality of being brilliant; splendor; glitter; great brighness, whether in a literal or figurative sense.

With many readers brilliancy of style passes for affluence of thought. Longfellow.

 

© Webster 1913.

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