1) Black's 5th move is to promote a pawn to a bishop with mate.
2) Black's 5th move is to promote a pawn to a knight with mate.
Here are the solutions:
1) 1.c3 d5 2.Qb3 d4 3.Kd1 dxc3 4.Kc2 cxd2 5.Qc3 d1B mate (Dia)
2) 1.d4 e5 2.Kd2 exd4 3.b3 d3 4.Kc3 dxe2 5.Kb2 exd1N mate (Dia)
Today's task can be seen as a prelude to a theme to which I hope to return shortly: Symmetrical positions and the advantage of moving first.
Can you construct a symmetrical game in which White's 4th move is mate?
The usual conditions apply:
All moves must be legal but obviously they don't have to make sense by conventional chess standards.
Unfortunately there are two and a half solutions. There are two different mate positions and one of them can be reached via two slightly different routes.