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.
Reason for choice: I like helpmates with their
clear-cut play free from duals and solutions in less than
the required number of moves. I particularly like to see
strategies which would never occur in a normal game of
chess. In the problem by Vieira, Black starts by unpinning
a White Knight in both settings, the White King could
capture the Black unit which has allowed the unpin, but
waits until the unpinned Knight has moved and been replaced
by a Black unit. Difficult to solve, one can only marvel at
the time and effort required to compose such a problem.