Kraemer shows an attractive idea in this problem, which he dedicated to his great friend and collaborator Eric Zepler.
The solution will appear here on Friday 21th November 2025.
1.Bf5 (threats 2.e4+ Sxe4 3.fxe4 and 2.Be5 threats 3.Sxc7 and 3.Sf6) Rg2
2.Bg4+ Bg5
3.Be5 (threat 4.Sxc7) Bd8
4.Bf6
In the mousetrap theme a piece vacates a line to allow an opposing piece through, then performs a switchback
to prevent the return of the piece. Here the theme is doubled, with the unpins providing added unity.