Survo puzzles: www.survo.fi/puzzles
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Copyright (c) Survo Systems 2006-2011

The easiest way to solve these three problems may be
using a Java Applet
http://www.survo.fi/swap/puzzles.html
based on the swapping method.

Survo puzzle 225/2011 (400) #443-27412

   A  B  C  D
1 10  *  *  * 41
2  *  *  *  * 56
3  *  *  *  * 24
4  *  *  *  * 15
  30 47 37 22

Survo puzzle 226/2011 (1300) #443-25154

   A  B  C  D
1  *  *  *  * 44
2  *  *  *  * 14
3  *  *  *  * 55
4  *  *  *  * 23
  31 45 22 38

Survo puzzle 227/2011 (?) #444-44444

   A  B  C  D
1  *  *  *  * 17
2  *  *  *  * 54
3  *  *  *  * 40
4  *  *  *  * 25
  49 31 38 18

This puzzle has several solutions. Find them all.