It’s Your Move: daily chess puzzle #224

Black to play and win

Gibbs v Schmid, Lugano Olympiad, 1968

Solution

A total rest day: 1..Qd5, and since 2 Nd5 Nf3+ 3 Kf1 Bh3 is mate, White must play 2 f3 when 2..Qf3 hits the Rh1, 3 Rf1 Qg2 0-1.