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Problem 4

Problem 4

Only Chess

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Rh4, Qxc8, Nd5#

Rh4, Qc7, Nd5#

Rh4, Qc6, Nd5#

Rh4, Qc5, Nd5#

Rh4, Nc4, Bd2#
it was more complicated
Rh4, Nb3, Rxb3#
and again
Rh4, Nd2, Bg7#
...
Rh4, d6, Qh8#

Rh4, d5, Qh3#

I sincerely hope I have covered my bases this time...

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Originally posted by morgski
[hidden]...[/hidden]
I sincerely hope I have covered my bases this time...
1.Rh4 Nc4 2.Bd2+ Kxd4

1 edit
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Did you mean Nxd2? There is nothing on d4 for K to x
Revised again:
Q

Rh4, Qxc8, Nd5#

Rh4, Qc7, Nd5#

Rh4, Qc6, Nd5#

Rh4, Qc5, Nd5#

N1
Rh4, Nc4, Rxb3#

Rh4, Nb3, Rxb3#

Rh4, Nxb7, Rxb3#

N2
Rh4, Nd2, Bg7#

P
Rh4, d6, Qh8#

Rh4, d5, Qh3#

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Re4, Rf4 and Rg4 don't work because then he's in the way of B1, B2 or Q for one of the above examples

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Originally posted by morgski
Did you mean Nxd2? There is nothing on d4 for K to x
Revised again:
Q
[hidden]...[/hidden]
Yeah, of course I meant 2.Nxd2! 😛

SOLV'D

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Originally posted by Fat Lady
I thought there were two solutions to this, but I've just worked out why one of them fails. My incorrect solution didn't have a mate after 1. (move) d7-d5, although it did after 1. (move) d7-d6.
1.Qxa5 Qc4 2.Nd5 checkmate

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Originally posted by Fat Lady
That last one isn't mate, Black can recapture with his b-pawn.
1.Qxa5 Qc4 2.Nd5 checkmate

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Originally posted by Fat Lady
The rook on d4 is hanging!

Your key move is much too mundane to be the solution.
Okay, I see.

2 edits
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Originally posted by morgski
Did you mean Nxd2? There is nothing on d4 for K to x
Revised again:
Q
[hidden] Rh4, Qxc8, Nd5# [/hidden]
[hidden] Rh4, Qc7, Nd5# [/hidden]
[hidden] Rh4, Qc6, Nd5# [/hidden]
[hidden] Rh4, Qc5, Nd5# [/hidden]
N1
[hidden] Rh4, Nc4, Rxb3# [/hidden]
[hidden] Rh4, Nb3, Rxb3# [/hidden]
[hidden] Rh4, Nxb7, Rxb3# [/hidden]
N2
[hidden] Rh4, Nd2, Bg7# [/hidden]
P
[hidden] Rh4, d6, Qh8# [/hidden]
[hidden] Rh4, d5, Qh3# [/hidden]
He must have put a lot of time in to come up with that mate in 2 puzzle.

P.S.
Rh4, Nc4, Rb3#
Rh4, Nxb7, Rb3#

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Originally posted by RJHinds
1.Qxa5 Qc4 2.Nd5 checkmate
Kxd4

This time I really mean it.

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A pleasant problem. The bPa3 drew my attention. It isn't needed in the initial position, as either 1 ... Na3 or 1 ... Nd2 would be met with 2 B(x)d2. Why, then, did the composer wish to prevent 1 ... Na3? The answer is that 2 Bd2 does not occur post-key. 1 Rh4 Nd2 2 Bg7 is a self-block, but 1 ... Na3 wouldn't be, and 2 Bg7 would leave d2 unguarded.