perplexus.info :: General : No Safety from the Queen

No Safety from the Queen (Posted on 2004-09-23)

Given a 5x5 chess board, place the fewest number of queens possible on the board such that no queens are under attack but every other space is under attack.

Submitted by logischer Verstand

Rating: 3.0000 (7 votes)

Solution: (Hide)

Place a queen at B3, D2, and E5. The board will then look like this ("X" symolizes an attackable square, "Q" symbolizes a queen):

_ 1 2 3 4 5 A X X X X X B X X Q X X C X X X X X D X Q X X X E X X X X Q

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Possible Solution	K Sengupta	2022-06-30 22:59:27
re: Solution... (This is real...)	Matt	2004-12-08 02:36:50
Solution...	Matt	2004-12-08 02:31:02
the right one	Franky	2004-10-25 08:38:40
easy solution	Franky	2004-10-25 08:25:37
The Answer(I think)	Han Solo	2004-09-29 17:21:00
the answer	Kyle	2004-09-26 19:07:55
My guess...	xvolution	2004-09-23 23:23:55
A075324	Jer	2004-09-23 12:17:40
7x7 board has unique minimal solution (shown here--spoiler)	Charlie	2004-09-23 09:44:12
re: 8x8 version--programs	Charlie	2004-09-23 09:34:32
8x8 version	Charlie	2004-09-23 09:29:22
More than one way	Charlie	2004-09-23 08:59:56
More than one Queen !	Syzygy	2004-09-23 07:10:14

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