Survo puzzles: www.survo.fi/puzzles --------------------------------------- Copyright (c) Survo Systems 2006-2007 The easiest way to solve these three problems may be using a new Java Applet http://www.survo.fi/swap/puzzles.html based on the swapping method. Survo puzzle 105/2008 (160) #443-60810 A B C D 1 * 6 * * 36 2 * * * 7 46 3 * 2 * * 24 4 * * * * 30 55 19 45 17 Survo puzzle 106/2008 (320) #443-16030 A B C D 1 * * 3 * 20 2 * * * * 37 3 * * * * 56 4 * 2 * * 23 50 20 28 38 Survo puzzle 107/2008 (500) #443-920 A B C D 1 * * * * 13 2 * * * 13 55 3 * * * * 43 4 * * * * 25 39 21 44 32