Survo puzzles: www.survo.fi/puzzles --------------------------------------- Copyright (c) Survo Systems 2006-2013 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 306/2013 (30) #252-11122 A B C E F 1 * * * * * 23 2 * * * * * 32 4 12 19 6 14 Survo puzzle 307/2013 (80) #263-63994 A B C E F G 1 * * * * * * 50 2 * * * * * * 28 8 4 18 21 13 14 Survo puzzle 308/2013 (200) #273-38140 A B C E F G H 1 * * * * * * * 32 2 * * * * * * * 73 17 24 15 11 8 10 20