It’s Your Move: daily chess puzzle #223

Black to play and win, after 1 Rd1??

Dubinsky v Bikhovsky, Moscow 1968

Solution

Examine all biffs immediately leads to 1… Qd1+ 2 Bd1 Rd1+; and all that has to be seen is that after 3 Kc2, 3…Rc1+! forks the King and Queen whether or not White captures it ( 4Kc1, 4…Nd3+; 4 Kd2, Ne4+).

And if White instead plays 3 Ka2, then there is a nice mate after 3…Nd3 biffing the queen en route to Nb4+ Ka3[] Ra1 mate.