Pérez Puyal - Horton, individual championship of Huesca Province, 2008, round two, position after White's 17.h2-h4.
Play now proceeded 17...Rd6 18.h5 Qd3 19.Qxd3 Bxd3 20.Rfd1 Bb5 and the game finished much, much later in a draw.
But in the above sequence, what did both players miss?
The complete game is given below.
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