poorthylacine: Thank you very much JNPOPE!
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!!
Sorry for the poor english of a Frenchman!!