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8 Queens

8 Queens

Posers and Puzzles

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- Add 5 White Queens
- No Queen may defend another

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Messing with FEN

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I think I'm going wrong somewhere. Firstly, the queen on E has to be on E6:

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Next, the queen on D has to be on D2:

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Next, the queen on C has to be on C7:


Now wherever you put a queen on the A file it covers both F squares and vice-versa.

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Cant fault that logic! The only 8 queen solution I have seen is where all the Queens are the same knight-move apart (ie 2up 1right, 2up 1right, 2up 1right).

Initial set-up must be wrong.

?

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Originally posted by wolfgang59
Cant fault that logic! The only 8 queen solution I have seen is where all the Queens are the same knight-move apart (ie 2up 1right, 2up 1right, 2up 1right).

Initial set-up must be wrong.

?
yes it is wrong Qh4 should be Qh3
sorry for that

[b]

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Here is my analysis of the problem in the next 3 posts (1 fen per post):

I've place Pawns on squares that are not attacked:

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If a Queen were at e7, then that eliminates c7, d6 & d8 leaving only c2 and d2 for c and d files, therefore the e Queen must be on e4.

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Thus a2 and c7 must be Queens, eliminating possible Queens for the d file.



I conclude that it is not possible

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The Qb5 should be on b4.

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don't mind the kings

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Originally posted by Dutch Defense
[fen]k6Q/5Q2/3Q4/1Q6/6Q1/4Q3/2Q5/Q6K w - - 0 1 [/fen]

don\'t mind the kings
Qa1 and Qh8 defend each other.

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Originally posted by MetBierOp
[fen]8/8/8/1Q6/7Q/8/8/6Q1 w - - 0 1[/fen]

- Add 5 White Queens
- No Queen may defend another

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Messing with FEN
It cannot be done

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Originally posted by Arachnarchist
It cannot be done
It cannot be done? I love these puzzles and this Problem CAN be done its not easy though,

The 8 Queens go on these exact Squares this wont work anywhere else, Try it yourself, not one Queen is threatening another Queen.
From Line A-H
Queens:
1:a5
2:b3
3:c1
4:d7
5:e2
6:f8
7:g6
8:h4

Try it out for yourself it works. Its Very Possible 🙂

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Originally posted by c00ushion
The 8 Queens go on these exact Squares this wont work anywhere else,
Not only can your configuration be rotated 3 different ways, but there is an example in this thread of a solution with a Q on a center square. So, it's not quite true that the Queens must go on 'exact squares'.