Survo puzzles: www.survo.fi/puzzles
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Copyright (c) Survo Systems 2006-2015

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 369/2015 (650) #443-55812

   A  B  C  D
1  *  *  *  * 31
2  *  *  *  2 24
3  *  *  *  * 44
4  *  *  *  * 37
  43 57 19 17

Survo puzzle 370/2015 (350) #443-55814

   A  B  C  D
1  *  *  *  * 37
2  *  *  *  * 24
3 14  *  *  * 44
4  *  *  *  * 31
  42 56 11 27

Survo puzzle 371/2015 (550) #443-55828

   A  B  C  D
1  *  *  *  * 50
2  *  *  *  * 37
3  *  *  *  * 17
4  *  *  *  * 32
  19 27 34 56