Yves Cheylan
The Problemist, 1973
Mate in 2
(b) bPf3->a3
(a) KEY: 1.Bd3!
(b) COOKS: 1.Qc4!, 1.Qg4!, 1.Qb5!
Miguel Uris
Correction
Mate in 2
(b) bPf3->a3