Eleven Moves

8/ppppkppp/8/4p3/8/8/PPPP1PPP/RNBQKBNR

Black has just made its eleventh move, which was not to escape white's only check. Which move then was white's check?

(Thank you, Opalescent Hermit, for finding an alternate solution to my original wording of this.)

15 November 2004 © Rarebit Dreams