This site now hosts a complete archive of PDF versions of The Problemist Supplement, from 1992 to the current year. This magazine is aimed mainly at newcomers to chess composition, so it is recommended for those who want to find out more about chess problems. You can find the archive here.
A problem whose form helps to make its idea crystal clear. Look out for the set play (mates already prepared for black moves in the diagram).
Mates are set for all of Black’s moves: 1...B any 2.Bf6; 1...Kc5 2.Bxe3; 1...Ke5 2.d4. White has no waiting move, and the key 1.Sd5 sets up a new zugzwang, in which the same three mates reappear, having moved around the defences in cyclic fashion: 1...B any 2.Bxe3; 1...Kc5 2.d4; 1...Ke5 2.Bf6. Such an ABC - BCA shift of mates is called the Lacny theme, after Slovak composer L’udovit Lacny, who composed the earliest example. The mutate form and lack of distracting by-play should ensure that the solver does not miss the idea.
Any comments or questions on this problem should be addressed to
Michael McDowell using the ‘Contact’ item in the menu on the left.