Could Petrosian have held against Fischer?

The Fischer-Petrosian Candidates match of 1971 in Buenos Aires was the third and final round in the eliminations to determine the challenger for the World Championship 1972. After defeating two top grandmasters 6-0 each, the charismatic American faced former World Champion Tigran Petrosian who was considered to be almost undefeatable. Their match started 2½-2½, and then in game six Fischer scored a superb win that turned the match in his favor. Did Petrosian seal the wrong move, could he have defended to a draw? You can help endgame specialist Karsten Müller with his historical analysis – and win a valuable prize.

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