Horton - Pérez Puyal, individual championship of Huesca Province, 2009, round five, position after 18.Rc1-c2.
Play now proceeded 18...Rfc8 19.Rac1 Be8 20.g4 Nd6 21.Qf3 Nd7 and despite playing 22.Na4? (to which a knight capture on e5 might have been a strong reply) and some worse moves besides, White later went on to win.
But in the above sequence, what did both players miss?
(The game is not given below, being too embarrassingly bad to reproduce in full.)
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