Game with castling (5)

I believe the answer is:

chess

(Other definitions for chess that I've seen before include "that has over thirty men on board" , "Sixteen-men-a-side game" , "Pure-skill board game" , "Board game of 13, 16 and 21" , "Benny Andersson and Bjorn Ulvaeus musical" .)

I've seen this clue in the USA Today.

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