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One move does not belong

One move does not belong

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@bigdogg said
If you mirror that position vertically, you get 1.Ba8#
Forgot to claim Ba6# is impossible from that position (since the bishop is already there.

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@ponderable said
Forgot to claim Ba6# is impossible from that position (since the bishop is already there.
But nothing is on a6.

If you meant a8, and that was the black King, it could be moved.

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I apologize for completely mangling the problem. Please disregard all my posts.
I actaully was under the impression that the diagonal from a1 to h8 was described what is definietyl wrong...

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@ponderable said
I apologize for completely mangling the problem. Please disregard all my posts.
I actaully was under the impression that the diagonal from a1 to h8 was described what is definietyl wrong...
No worries.

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Hi Ponderable

mangling the problem is my specialty. I've not given up.
Spent day at Dunbar visiting old friends and tonight have to get a team together
for 10 board for a league match tomorrow night.
(I always put this things off to last minute.)

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@greenpawn34 said
Hi Ponderable

mangling the problem is my specialty. I've not given up.
Spent day at Dunbar visiting old friends and tonight have to get a team together
for 10 board for a league match tomorrow night.
(I always put this things off to last minute.)
This one is tough.

It took me a few days to solve.

[It's not my composition.]

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1.Ba1# 1.Ba2# 1.Ba3# 1.Ba4# 1.Ba5# 1.Ba7+ 1.Ba8#
and the White Queen can reach c4. So 1. Ba6 is the bogey.

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I came up with the same answer as did Geoff ( Ba6# ), and my construction is similar to his.

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@greenpawn34 said
[fen]3R4/3B4/RB1k1BR1/3B2B1/8/3QB3/8/2B4K w - - 0 1[/fen]
1.Ba1# 1.Ba2# 1.Ba3# 1.Ba4# 1.Ba5# 1.Ba7+ 1.Ba8#
and the White Queen can reach c4. So 1. Ba6 is the bogey.
SOLV'D - 1.Ba6# is the invalid move.

For the diagram, we'll add wK to b8 to cover the c7 square and make 1.Ba7 a mate.

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I was thinking after I had isolated the a-file Bishop Ba6 mate and found
how to play Qc4 I could tidy it up a bit but I was only too glad to get it.

With the Black King on d3 the impossible move would be Ba3# Yes?

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@greenpawn34 said
I was thinking after I had isolated the a-file Bishop Ba6 mate and found
how to play Qc4 I could tidy it up a bit but I was only too glad to get it.

With the Black King on d3 the impossible move would be Ba3# Yes?
Seems like it.

Qc4 is to force the K to a square like d6 in the first place.

There was another version of this problem given to me. Same Bishop mates, but with 1.R1c4 and R1c7 instead of 1.Qc4.

I felt that this was cooked. For example:


This does not have 1.Ba8#
But move Ra8 to a7, and you have all but 1.Ba7#

The composer did not think my solution was acceptable. In his mind, "R1c7" means there's an R on c8.

Armed with that knowledge, I found:



This one has no 1.Ba6# as he intended.

I prefer the 1.Qc4 version. It gives less of the position away, and only needs one 'steering' move instead of two.

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