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 186/2010 (90) #342-50020 A B C D 1 * * * 10 31 2 * * * * 14 3 * * * * 33 16 29 9 24 Survo puzzle 187/2010 (80) #343-13008 A B C D 1 * * * * 42 2 * * * * 23 3 * * * * 13 13 17 26 22 Survo puzzle 188/2010 (870) #443-34532 A B C D 1 * * * * 27 2 * * * * 12 3 * * * * 52 4 * * * * 45 20 45 31 40