Horton - Hernández Delgado, Aragón Team Championship 2009, Casino Jaque v Estadio M. El Olivar C, board one, position after Black's 22...c6-c5.
White was winning back a pawn he had sacrificed for pressure: Black chose to return it on c5, rather than c6. Both players saw that if 23.Qxc5 Black could play 23...Ne6, gaining a little more space for his pieces, so White preferred to capture with the knight instead via 23.Nd3 Ne6 24.Nxc5, leaving him, after 24...Nxc5 25.Qxc5 c6, with an edge in an equal-material ending (which Black mishandled, losing rather quickly).
But in the above sequence, what did both players miss?
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