Survo puzzles: www.survo.fi/puzzles --------------------------------------- Copyright (c) Survo Systems 2006-2010 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 195/2010 (90) #343-13552 A B C D 1 * * * * 13 2 * * * * 42 3 * * * * 23 12 19 25 22 Survo puzzle 196/2010 (170) #443-21994 A B C D 1 * * * * 31 2 * * * * 55 3 8 6 * * 39 4 * * * * 11 30 22 45 39 Survo puzzle 197/2010 (500) #443-45428 A B C D 1 * * * * 12 2 * 6 * * 44 3 * * * * 27 4 * * * * 53 38 20 33 45