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 Nine square pieces (Posted on 2005-12-11)
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)

 Subject Author Date re(3): For those who wanna try... random sampling ... computer used Charlie 2005-12-12 16:17:23 re(2): For those who wanna try... random sampling ... computer used pcbouhid 2005-12-12 15:45:38 re: For those who can try... random sampling ... computer used Charlie 2005-12-12 15:35:36 For those who can try... pcbouhid 2005-12-12 10:25:44 Both (all) solutions -- computer used -- spoiler Charlie 2005-12-11 19:25:20 re(2): question pcbouhid 2005-12-11 18:31:24 re: question Larry 2005-12-11 17:23:59 question James 2005-12-11 15:00:03 One solution by hand (spoiler) Larry 2005-12-11 12:08:23

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