perplexus.info :: Games : Rook Placement

Rook Placement (Posted on 2015-09-21)

We place 41 rooks on a 10 x 10 chessboard. Prove that one can choose five of them that do not attack each other.

*** Two rooks "attack" each other if they are in the same row or column of the chessboard.

Source: A problem appearing in Colorado Mathematical Olympiad.

See The Solution Submitted by K Sengupta

Rating: 5.0000 (1 votes)

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

Subject	Author	Date
re(2): the “official” solution - spoiler	Ady TZIDON	2015-09-27 06:41:47
re: the “official” solution - spoiler	Steve Herman	2015-09-27 06:39:20
the “official” solution - spoiler	Ady TZIDON	2015-09-26 16:45:00
re: Detailed solution (SPOILER)	Charlie	2015-09-26 07:51:35
Detailed solution (SPOILER)	Ady TZIDON	2015-09-26 06:10:45

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