4th Prize, Los Angeles Times, 1979-81
Mate in 3
An intriguing three-mover with cleverly separated continuations.
1.Kg5 threatens 2.Qh3+ K×e4 3.d3 or Re2 or Bh7, and exposes the white king to three checks from the black queen. If 1...Qa5+ 2.e5+ Be4 3.Bc4. If 1...Qb5+ 2.Bd5 threats 3.e5 and 3.Qh3, 2...Q×d5+,B×d5 3.exd5 or 2...Qd7 3.Bc4. Finally if 1...Qc5+ 2.Rd5 threat 3.e5, 2...Q×d5+ or B×d5 3.exd5, or 2...Qc8,Q×a3 or Q×e7 3.R×d4. There is one by-play variation – 1...Q×d2 2.R×d4+ Kc3 3.Sb5 or 2...Ke3 3.Qh3. It is interesting to figure out why only one continuation works after each check.
Dafydd Johnston: The check-inviting key is striking enough in itself, but the reasons why each check must be answered by a different move are the most interesting thing about this problem.
Guy Meissonnier points out that 1.Qg6? is an excellent try, refuted only by 1...Sd7!