Hi Ed, Here's the solution to the Orthogonal Sudoku (I hope -- I've checked it for uniqueness of 2-digit numbers, but haven't verified the two component sudoku puzzles are right... I assume they are, by construction, of course...). 59 23 96 | 18 42 75 | 84 61 37 88 62 35 | 57 21 94 | 16 43 79 17 41 74 | 89 63 36 | 55 22 98 ---------+----------+--------- 26 99 53 | 45 78 12 | 67 34 81 65 38 82 | 24 97 51 | 49 76 13 44 77 11 | 66 39 83 | 28 95 52 ---------+----------+--------- 93 56 29 | 72 15 48 | 31 87 64 32 85 68 | 91 54 27 | 73 19 46 71 14 47 | 33 86 69 | 92 58 25 Cheers, Steve Tregidgo ------------------------------------------------- Hi This was a really fun variant. The solution: 59 23 96 18 42 75 84 61 37 88 62 35 57 21 94 16 43 79 17 41 74 89 63 36 55 22 98 26 99 53 45 78 12 67 34 81 65 38 82 24 97 51 49 76 13 44 77 11 66 39 83 28 95 52 93 56 29 72 15 48 31 87 64 32 85 68 91 54 27 73 19 46 71 14 47 33 86 69 92 58 25 Best regards, Stefan Bengtsson ------------------------------------------------- Dear Ed, This needs no guessing/backtracking, just keep track of used pairings. Easier than 'magic sudoku'. 59 23 96 18 42 75 84 61 37 88 62 35 57 21 94 16 43 79 17 41 74 89 63 36 55 22 98 26 99 53 45 78 12 67 34 81 65 38 82 24 97 51 49 76 13 44 77 11 66 39 83 28 95 52 93 56 29 72 15 48 31 87 64 32 85 68 91 54 27 73 19 46 71 14 47 33 86 69 92 58 25 Yours sincerely, Kevin A. Woodburn ------------------------------------------------- More Solvers: Konstantin Knop, Michael Keller, Evgeni Lukin, The Valery's ------------------------------------------------- Hi! Thank you for your nice Sudoku!!! 59 23 96 18 42 75 84 61 37 88 62 35 57 21 94 16 43 79 17 41 74 89 63 36 55 22 98 26 99 53 45 78 12 67 34 81 65 38 82 24 97 51 49 76 13 44 77 11 66 39 83 28 95 52 93 56 29 72 15 48 31 87 64 32 85 68 91 54 27 73 19 46 71 14 47 33 86 69 92 58 25 Tony Yang ------------------------------------------------- Dear Ed Pegg Perhaps it is much to late but I just see it now ( because my computer is crashed) but is was plesant to solve Greetings Odette De Meulemeester www.pentominoes.be ------------------------------------------------- 59 23 96 18 42 75 84 61 37 88 62 35 57 21 94 16 43 79 17 41 74 89 63 36 55 22 98 26 99 53 45 78 12 67 34 81 65 38 82 24 97 51 49 76 13 44 77 11 66 39 83 28 95 52 93 56 29 72 15 48 31 87 64 32 85 68 91 54 27 73 19 46 71 14 47 33 86 69 92 58 25 thank you for the good and fine time I had during the resolution Eduardo Fernandez Martin From ANDORRA