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.
If the point of a problem lies in striking post-key strategy then the ideal type of
key is a thematic key, one which makes that strategy possible. This two-mover is a
fine example. Further examples of the work of Comins Mansfield can be found in an
article under Chess Composers on the home page.
Solution: A clue to finding the key move is the unprovided flight 1...Ke5, since
any threat must attack both d5 and e5. The key is 1.Kb4!, threatening 2.Qa5 and
walking into four discovered checks by pawn moves. This gives the variations
1...e6+ 2.Rc5, 1...e5+ 2.Rd6, 1...e3+ 2.f4 and 1...exf3+ 2.Rc4.
Any comments or questions on this problem should be addressed to
Michael McDowell using the ‘Contact’ item in the menu on the left.