(14.12.2013) Помощен мат, който авторът нарича "Използване на офицери". Добре дошъл на Алексей Оганесян от Русия!

1.b1B Bc1 2.Be3 Bxe3 3.Bf5 Bxf5 4.Bd3 Be6#  

The name of this problem is “Benefit of Bishops”! It includes:

- Black underpromotion (in bishop of course!);

- Both white bishops take black bishops;

- Interesting replacement the blocking bishop d3 on another bishop via

underpromotion.

Model mate.

(Author)