Introducing 'Mutual Mate' Problems
Duplex problems are loosely defined as satisfying the same stipulation with the colours reversed, and are typically found in helpmates. In this article, Azlan Iqbal expounds on the much rarer variety that applies to direct mates. Using incidental examples taken from his computer-generated chess problem collection and a couple by human composers, he challenges readers to compose some of their own. For starters you can try to solve the problem shown in our picture. Both White and Black can mate in five, if they have the first move.
Source: chessbase.com