1.Qf2
1...Bxb7 2.Re8+ Kxe8 3.g8R+ Ke7 4.Sd5+ Bxd5
1...Bxg7 2.Bd6+ Kxd6 3.b8B+ Ke7 4.Sd5+ Bxd5
White sacrifices a piece in order to open a bishop line with a promotion check, the promotion being to the same type of piece as that sacrificed, an idea known as the Phoenix theme. The retreating queen key is nicely worked in.
Loganathan: This self mate problem was interesting though it was relatively easy as there was only one mating possibility for Black.
Guy Meissonnier: A marvellous chess nut by the French Grandmaster!