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.
An unusual position in that the forces are evenly balanced, but a
beautifully clear example of a standard theme.
1.Kb1 threatens immediate mate by 2.Ra3, but exposes the king to rook checks. In checking, each rook unguards a potential mating square (a7 or c5) which must be reguarded, but White first decoys the rook with a bishop sacrifice so that when the rook returns it interferes with the g8 bishop.