perplexus.info :: General : Unfilled grid

Unfilled grid (Posted on 2006-05-23)

Fill as much of a 6x6 grid with the letters A, B, C, D, E, F so no two of the same letter are in the same row, column or diagonal.

It is impossible to entirely fill the grid, but what is the largest number of letters that may be placed?

Submitted by Jer

Rating: 4.1429 (7 votes)

Solution: (Hide)

32 letters can be placed as follows:

ABCDEF DEAFBC FC DA BD CE CAEBFD EFDCAB
There were some solutions with 33 submitted that turned out not to work. I am confident this is the best possible.

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

Subject	Author	Date
Explanation to Puzzle Answer	K Sengupta	2022-07-16 00:04:27
Puzzle Answer	K Sengupta	2022-07-15 02:57:00
answer/solution	nick barr	2006-05-30 14:25:58
re: Possible solution.	Charlie	2006-05-23 23:57:51
Possible solution.	Dej Mar	2006-05-23 11:42:33
program finished	Charlie	2006-05-23 10:24:14
computer program still running, but so far...	Charlie	2006-05-23 09:41:16

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