It’s Your Move: daily chess puzzle #290

Black to play and win

Martius- Dueball, Kassel 1970

Solution

“Improve the worst placed piece”: 1…Qb6! and the Queen can’t be taken because of 2…Be4.

Black threatens 2..Qb2, so say 2 b3, when 2…Qb5! is another double attack, threatening either 3…Qf5! or 3…Qe2: 0-1