Gerardus H. Drese
2nd Prize, Probleemblad, 1972
Mate in 3
An ambitious problem which successfully realises a very difficult idea.
1.Qc2! threatens 2.Qe2+ Kd4 3.Qe3. 1...Qg5 2.Qc5+ Ke4 3.Qd5 (R pinned on diagonal); 2...Ke6 3.Qxe7 (B pinned on rank); 1...Bg5 2.Bb2+ Kf4 3.Sd5 (R pinned on file); 2...Ke6 3.Qxf5 (Q pinned on rank); 1...Rg5 2.Qe2+ Kf5 3.Sxg7 (B pinned on file, Q pinned on diagonal); 2...Kd4 3.Qe3; 2...Qe4 3.Qxe4; 1...Q×h6 2.Q×f5+ Kd4 3.Bb2; 1...R×f2,Rf3,Rf4 2.Qc5+ Ke4 or Ke6 3.Qd5; 1...Ke6 2.Qa2+ Ke5 or Rd5 3.Q(×)d5. The theme is triple anticipatory half-pin. The triangle of black pieces at f5, f6 and g6 form three half-pin lines into which the black king can move. During the course of the solution each of the three pieces is pinned twice, in different directions, giving the full complement of six half-pin mates, including a double-pin mate after 1…Rg5. A superb achievement.