AgONGy!

LOST horribly this morning to a Malaysian-registered junior in round four of the South Wales International.

White to make his 26th move in Spanton (1900) - Weng Yan Ong (1624)

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26.Qxa8??
This loses trivially. Also no good is 26.Rd2?? Nxh3+ 27.gxh3 Rxf1+ 28.Kxf1, as 28...Rf8+ gives Black a mating attack, eg 29.Ke2 (equally hopeless are 29.Kg2 Qg5+ and 29.Kg1 Qe1+) Rf2+ 30.Kd3 Qc4+ 31.Ke3 Qf4+ 32.Kd3 Rxd2+ etc.
Correct, as Stockfish10 and Komodo9 immediately show, is 26.Nd7!, which leads to the forcing line 26...Nxd1 27.Nxf8 Qd4+ 28.Kh1 Qc4 29.Qxc4 bxc4 30.Ng6+ Kh7 31.Rxd1 Kxg6, when White will emerge a pawn up, albeit in a rook-and-pawn ending.
26.Rde1, according to Stockfish10, and 26.Ne6, according to Komodo9, were good enough for a draw.
The game finished:
26...Nxh3+ 27.gxh3 Rxa8 28.Kh2 Re8 29.Rf3 Re2+ 30.Kh1 Qg5 0-1