Daily chess puzzle

Today’s puzzle was prepared whilst travelling, so is in a different format from those published when at home.

Black to play

(1…Rg2 loses, as shown yesterday)

Hartoch v Spassky, Amsterdam July 27 1970

Solution

1…Be8! removes the threat of Qf8+ whilst keeping the pressure on g2. Hartoch played 2 Rg1 but resigned after 2…Qg1+., since 3 Kg1[] Rg2+ 4 Kf1 (4 Kh1 Rge2 is also trivial).

4… Bb5+ (the attacking point of Bf7-e8) and mates.