Helpmate with set play

H#5*

The stipulation means, there are two problems to solve:

1. From the given position, WHITE moves first, black & white cooperate, white's 5th move is mate.
2. From the given position, BLACK moves first, black & white cooperate, white's 5th move is mate.

OK, here is another helpmate challenge:

Compose a helpmate in 4 moves with a single solution. In the solution, Black's 4 moves are promotion to rook. As usual, the initial position should be legal and without promoted pieces.

Originally posted by David113
OK, here is another helpmate challenge:

Compose a helpmate in 4 moves with a single solution. In the solution, Black's 4 moves are promotion to rook. As usual, the initial position should be legal and without promoted pieces.

Originally posted by SwissGambit
I have 1 of the 2 sols in the first one. The set play eludes me.

[fen]K7/8/8/2P3p1/8/8/8/7k[/fen]
h#4

Originally posted by David113
In the position you gave, only one black move is a promotion.

Originally posted by David113
[fen]8/p1p5/KpPp2p1/1P1P2P1/5Q2/8/6k1/8[/fen]
H#5*

The stipulation means, there are two problems to solve:

1. From the given position, WHITE moves first, black & white cooperate, white's 5th move is mate.
2. From the given position, BLACK moves first, black & white cooperate, white's 5th move is mate.

Originally posted by SwissGambit
1...Qd4 2.Kf3 Qxb6 3.Ke4 Qa5 4.Kxd5 b6+ 5.Kxc6 Qb5
1.Kh3 Qe5 2.dxe5 d6 3.Kg4 d7 4.Kf5 d8Q 5.Ke6 Qd7

I made a h#3 with 3 bR promotions. It had scads of promoted force, though. I'm not even sure it was a legal position - I was mainly trying to get the sequencing down. I don't really make many helpmates. I picked a doozy of a task to try out, didn't I? It's kind of like that h#5 challenge where both sides promote to an N [with pawns starting from their home squares]. Every n00b tries it, but it still remains unsolved.