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 192/2010 (40) #443-56978 A B C D 1 10 * 6 * 46 2 * 8 * * 20 3 * * * * 40 4 * * * 12 30 23 46 15 52 Survo puzzle 193/2010 (1200) #443-93226 A B C D 1 * * * * 43 2 * * * * 24 3 * * * * 30 4 * * * * 39 46 54 12 24 Survo puzzle 194/2010 (400) #443-53596 A B C D 1 * * 8 * 38 2 * * * * 32 3 * * * * 24 4 * * * * 42 57 11 27 41