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-ristikko 201/2010 (25) #333-18894 A B C 1 8 * * 21 2 * * * 9 3 * * * 15 17 20 8 Survo-ristikko 202/2010 (15) #333-27626 A B C 1 * * * 15 2 * * * 7 3 * * * 23 10 19 16 Survo-ristikko 203/2010 (75) #343-80300 A B C D 1 * * * * 39 2 * * * * 22 3 * * * * 17 23 9 17 29