(Continuing the series from here)
Here is a second selfmate puzzle (also relatively easy, but beware the traps!). It is by C. R. Flood from 1967, and is puzzle 81 in The Book of Extraordinary Chess Puzzles:
White to play and selfmate in three.
As a reminder: "In a 'selfmate' problem White plays to force Black to checkmate him - a sort of chess suicide."