37...Kg8 ("After this move Judd regarded his game as lost.")

Of course, like for other games, I specify I am just a patzer: Fritz 11 and Rybka made the work of analysis. However, it's surprising that Mackenzie did not see:

1: 39. Qc3 and the double threat QxRb2 and c7c8Q+ is winning immediately and simply; but maybe Judd saw that, and was blinded by his possibility of trying a mating attack, which however would have been more successful after 40.Rxf7 Qxf7 41.c8Q+ winning;

2: Bc5! with a lethal attack on the case f8.

Maybe then Judd, under the still terrible attacking pressure of Mackenzie, and so to much stressed, at his turn did not see his own possibility of winning after the blunder of Mackenzie at the 44th move, tragic oversight at last for the young Max Judd!

One more and very instructive example of evidence that playing chess needs strong nerves, "cold blood" or no blood at all but this one only if you are a silicon being!!

41.Qxh6?

Analysis by Stockfish 250520 64 BMI2:

1. +- (13.14): 41.Rf8+ Kxf8 42.Qf6+ Kg8 43.Qd8+ Kh7 44.Qxd7 Rxd7 45.c8Q Rf7 46.h3 Re7 47.Qc1 Re2 48.a6 g4 49.hxg4 Kg6 50.a7 Rxa7 51.Bxa7 Rxe5 52.Bd4 Re4 53.Qc8 Kg5 54.Qg8+ Kf4 55.Qg7 Re2 56.Qxh6+ Ke4 57.Qxe6+ Kd3 58.Qxd5 Rd2 59.Be5+ Kc2 60.Qc4+ Kb1 61.Qb3+ Kc1

2. +- (8.61): 41.Qd3 Qc8 42.Qa3 Rc2 43.a6 Rcxc7 44.Bxc7 Qxc7 45.Rf8+ Kh7 46.Qd3+ Rg6 47.Kh1 h5 48.Qb1 d4 49.Rf6 d3 50.Qxd3 Qc1+ 51.Rf1 Qc7 52.Qf3 g4 53.Qf7+ Rg7 54.Qxh5+ Kg8 55.Qe8+ Kh7 56.Qxe6 Qc2 57.Qf6 Qg6 58.e6 Qxf6 59.Rxf6 Kg8 60.Rf7 Rg6 61.a7 Rxe6 62.a8Q+ Kxf7 63.Qd5 Ke7 64.Kg1 g3 65.Qg5+ Kd7 66.Qxg3 Rc6 67.Qf4 Kc8 68.h4 Ra6 69.g4

42.Qf6?

Analysis by Stockfish 250520 64 BMI2:

1. +- (63.26): 42.Bc5 Qe8 43.Rf8+ Qxf8 44.Bxf8 Rb1+ 45.Kf2 Rb2+ 46.Kg3 Rxc7 47.Qxg5+ Kxf8 48.Qd8+ Kf7 49.Qxc7+ Kg6 50.Qd6 Kf5 51.Qxd4 Rb3+ 52.Kf2 Ra3 53.a6 Ra2+ 54.Kg1 Rxa6 55.Qd3+ Kxe5 56.Qxa6 Kf5 57.Qd6 e5 58.Kf2 Ke4 59.Qe6 Kd4 60.Qe7 Ke4 61.Qd6 Kf4 62.Qd5 Kf5 63.Kg3

2. +- (21.19): 42.Rf8+ Kxf8 43.Qh8+ Kf7 44.c8Q Qxc8 45.Qxc8 Rb1+ 46.Kf2 d3 47.Ke3 g4 48.a6 g3 49.Qd7+ Kf8 50.Qd8+ Kf7 51.Qf6+ Kg8 52.Qxe6+ Kh7 53.a7 Ra1 54.Qh3+ Kg8 55.Qc8+ Kf7 56.Qb7+ Kg6 57.Qe4+ Kg5 58.Qf4+ Kh5 59.Qf5+ Kh6 60.Qh3+ Kg6 61.Qxg3+ Kh7 62.Qh4+ Kg8 63.Qd8+ Kf7 64.Qd5+ Kg6 65.a8Q Rxa8 66.Qe4+ Kf7 67.Qxa8

And 43.Qd8+?? Kh7 44.Rf3??

Analysis by Stockfish 250520 64 BMI2:

1. -+ (-#15): 44...Rb1+ 45.Rf1 Rxf1+ 46.Kxf1 Rf7+ 47.Qf6 Rxf6+ 48.exf6 Qc1+ 49.Ke2 Qc2+ 50.Kf3 Qd3+ 51.Kf2 Qd2+ 52.Kf1 d3 53.h4 Qc1+ 54.Kf2 d2 55.hxg5 Qe1+ 56.Kf3 d1Q+ 57.Kf4 e5+ 58.Kf5 Qd7#