<Burn, playing Black, is to move, and is trying to find a way to save the draw.
White is threatening the immediately winning 65. Ra5 but black has a simple draw with 64...Rxa7 followed by
65. Kxa7 g4
66. Rb4 Kd5
67. Rxg4 e4 etc.
But Burn plays
This is of course followed by 65. Ra5 (65...Rb1+ 66. Ka6 1-0).
Maybe a time trouble mistake? No, he had lots of time with a time control just passed.
Maybe temporary chess blindness? No, Burn <annotated the game in the tournament book, and concludes that white is winning in the position in the diagram. <Burn wrote was 63...g5 was a blunder after which Black was lost.>>
The old masters were great for their day, I just think people shouldn't compare their actual playing level with that of today's top players.>