Duplex: Claustrophobia.

Duplex.

In chess composition - one of the varieties of twin chess problem. The requirements for the use of both white and black pieces are usually very, very high. Most often, this type of chess composition is found in helpmate problems, but not only. The most striking example of Duplex belongs to the authorship of the founder of The Problemist magazine, Thomas Rayner Dawson.

1st prize, Falkirk Herald, 1933

White to move and mate in 2:
1.0-0 with the inevitable 2.Rd1#.

Black to move and mate in 2:
1.Ra6 and White cannot avoid 2.Ra1#, since either their king or rook moved on the previous move, and castling is no longer possible.

For chess composers, Duplex is a rather complex thematic task that requires not only the aesthetics of the composition, but also a lot of time to create it.
Let me introduce you to my latest work this year: Claustrophobia.
Each opposing side has a way out of any conflict. The question is who will start first.

White to move and mate in 3.

Black to move and mate in 3.