It’s Your Move: daily chess puzzle #261

Black to play and win

Kapengut v Vaganian, Dubna 1970

Solution

The first moves are straightforward, but how to finish off? And after 1…Rb2! 2 Kb2[] Qc3+ 3 Kca[] it is not obvious how to proceed.

Eventually I realised a slow move was needed, bringing up reinforcements: 3…Rb8! and it is all over, since 4…Rb1+! is threatened, deflecting White’s King to b1, when Qb2 is mate.

Nice.