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Nine square pieces (Posted on 2005-12-11) Difficulty: 2 of 5
You are given 9 square pieces (A - I), each one having in each side a number from 1 to 4, positive or negative, as shown:
        +------------+   +------------+   +------------+
        |     +1     |   |     +2     |   |     +1     |
        |            |   |            |   |            |
        |-3   (A)  +4|   |+3   (B)  -1|   |+3   (C)  -2|
        |            |   |            |   |            |
        |     -2     |   |     -4     |   |     -4     |
        +------------+   +------------+   +------------+
        +------------+   +------------+   +------------+
        |     -1     |   |     -2     |   |     +2     |
        |            |   |            |   |            |
        |+2   (D)  -4|   |-4   (E)  +1|   |+1   (F)  -3|
        |            |   |            |   |            |
        |     +1     |   |     +3     |   |     -4     |
        +------------+   +------------+   +------------+
        +------------+   +------------+   +------------+
        |     +3     |   |     -3     |   |     +3     |
        |            |   |            |   |            |
        |-2   (G)  +4|   |+2   (H)  -4|   |-2   (I)  +4|
        |            |   |            |   |            |
        |     -1     |   |     +1     |   |     -3     |
        +------------+   +------------+   +------------+
Your task is to juxtapose them forming a 3x3 grid so that "touching numbers" of each pair of touching pieces (horizontally or vertically) adds to zero.

Note: You are free to rotate the pieces.

See The Solution Submitted by pcbouhid    
Rating: 3.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re(3): For those who wanna try... random sampling ... computer usedCharlie2005-12-12 16:17:23
re(2): For those who wanna try... random sampling ... computer usedpcbouhid2005-12-12 15:45:38
re: For those who can try... random sampling ... computer usedCharlie2005-12-12 15:35:36
For those who can try...pcbouhid2005-12-12 10:25:44
SolutionBoth (all) solutions -- computer used -- spoilerCharlie2005-12-11 19:25:20
re(2): questionpcbouhid2005-12-11 18:31:24
re: questionLarry2005-12-11 17:23:59
questionJames2005-12-11 15:00:03
SolutionOne solution by hand (spoiler)Larry2005-12-11 12:08:23
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