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The Olympic Charter says winter sports must be played on snow or ice, so the Chess Federation says they'll play with ice pieces. The Olympic charter also says sports must be sports.

"Lightning Fill In The Blank". "Wait Wait...Don't Tell Me!" with Peter Sagal, www.npr.org. May 2, 2015.
The Olympic Charter says winter sports must be played on snow or ice, so the Chess Federation says they'll play with ice pieces. The Olympic charter also says sports must be sports.