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Another Gattai-8 (enxio27 tuned) http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=4&t=451 |
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Author: | Børge [ Sun Mar 22, 2009 1:05 pm ] |
Post subject: | Another Gattai-8 (enxio27 tuned) |
All sudoku puzzles in this forum post are the intellectual property of Børge Alexander Tetlie Anderssen. There are four difficulties to choose from. All four puzzles have the same solution. The difficulty levels explained The ratings explained A) Apprentice 1: Moderate Another Gattai-8 #A (Apprentice 1) Rating based on required solving techniques: Moderate 000600081003090000840000090090003002020000130080070005007300000000000000004012000 003900000000300091006002000050406000000000600608103040000030000000000000000009000 004009018001007000000000200000000702000098500503016900000000000000004090000031607 000109000000000000000000000000000000530701000000005008000000000000200000000006000 000702000000000000000306000000040300792000000000000709000100000000000000000083000 900000000000000000000235000005020000000070003604001200000060010100809000050100002 000060000000309000000000000000805000000026030060090100030000000050008400100030029 000000000000001070000500400010007005020004108000090700100405000096270000000000624 Another Gattai-8 #B (Apprentice 2) Rating based on required solving techniques: Tough 000600081003090000840000090090000002020000130080270905007350000000000000004010000 003900000000000091006002000050400000000000600608103040000038000000000000000009000 000029018001007000000000200008000702000098500503016900000000000000004090000031000 000109000000007000000000000000000150530701000000005008000070000000200000000006000 000702000000000000000006000000040300792000000000000709000100000000000000000080000 900000000000000000000235000075420000000070003004001200400060000100809030050100002 000060000000309000000000000300805000000020000060090100030000800050008400100000029 000700000000001200000500400019007005020004108000090000000005000090270000000000624 Another Gattai-8 #C (Apprentice 3) Rating based on required solving techniques: Hard 000600081003090000840000090090003002020000030080070005007300000000000000004012000 003900200000300091006002000050400030000000600008103040000038000000000000000009000 054009010001007000000000200008000702000090500500016900000000000000004093000031600 000109000000000000000000000000000000530701000100005008000070000000200000000006000 000702000000000000000006000000047000002000000000000709000100000000000000000083000 900000000000000000010205000075420000000070003604001200400060000100809000050100002 000060000000309000000000000300805090000020030060090100030000000050018400000030029 000000000000001270000500400010007005020000108000090000100405000090200000000000624 Another Gattai-8 #D (Master) Rating based on required solving techniques: Super Hard 000600080003090000840000000090000002020000030080070905007350000000000000034012000 003900200080300091006002000050400000000000600008103040000008000000000000000009000 054009010001007000000000200008000702000090500000016900000000000000004093000031607 000109000000007000000000000000000100530700000100005008000070000000200000000006000 000702000000000000000006000000040300702030000000000009000100000000000000000080000 940000000000000000000235000075020000000070003600001200400060010100809000050100002 000060000000309000000000000000805090000026000000000100030000000050018400100030029 000700000000001200000500400019007005000004108000090000000005000096270000000000624 |
Author: | enxio27 [ Tue Mar 24, 2009 2:31 pm ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
Oh, fun! Good timing, too! I just knocked out several puzzles on my trip to Italy last week (10.5-hour flight back to the U.S., and no way to see out the window ). A couple of them (from the Cross+A site at http://www.cross-plus-a.com/sudoku.htm) were boringly easy (mostly naked singles). I think I may have identified a bug in JSudoku's pencil-mark calculation, which I'll explore further in another thread. I tried to slog through the Christmas Shogun (Journeyman edition) again, but made very little progress (a previously-missed set of locked candidates that didn't get me very far). Now that I have access to a computer again, I'll have to plug it into a solver and figure out what else I'm missing. In the mean time, I'll give these a shot. I'm at the "Hard" level and trying to work my way up to "Very Hard". I'm getting better at finding N/H triples and quads, and I'm starting to get the hang of XY-wings (when I can find them). I can sometimes find a swordfish, but I have yet to find one that actually eliminates any candidates, probably because I don't find the swordfish until at least the second pass through the puzzle, after most of the N/H sets and locked candidates have been found. I haven't even looked into jellyfish or squirmbag yet, though. |
Author: | Børge [ Tue Mar 24, 2009 8:38 pm ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
Just a short warning: Another Gattai-8 #C is a toughie A large Naked Subset (or a tiny bit smaller Hidden Subset) is needed before any of the eight 9x9 subgrids are completely solved. |
Author: | enxio27 [ Sat Mar 28, 2009 12:14 am ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
Børge wrote: Just a short warning: Another Gattai-8 #C is a toughie A large Naked Subset (or a tiny bit smaller Hidden Subset) is needed before any of the eight 9x9 subgrids are completely solved. Thanks for the warning! I'm working my way through #A. So far, so good. I've been trying to get through at least one grid each evening before I get so tired I can't see straight anymore. |
Author: | enxio27 [ Tue Mar 31, 2009 2:23 am ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
I finished the #A edition today. Now I'm trying to go back to the Christmas 2008 Shogun (Journeyman edition) to see if I can figure out what I'm missing, but I'm having trouble with SudokuSolver's hint function. (I really don't want it to give me the next step outright.) |
Author: | Børge [ Wed Apr 01, 2009 9:22 pm ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
enxio27 wrote: Now I'm trying to go back to the Christmas 2008 Shogun (Journeyman edition) to see if I can figure out what I'm missing, .... Try examining g6:n4 and g7:r4
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Author: | enxio27 [ Thu Apr 02, 2009 3:03 am ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
Børge wrote: enxio27 wrote: Now I'm trying to go back to the Christmas 2008 Shogun (Journeyman edition) to see if I can figure out what I'm missing, .... Try examining g6:n4 and g7:r4By g6 and g7, do you mean the center and rightmost grids in the center row? And by n4 do you mean r4-6 c1-3 ? If so, I found the triplet and quad in g7:r4 and the 2 in g6:r4c1, but not much else in those two locations. What am I not seeing? Here's what I have so far for those two: Grid 6: .-------------------------------.-------------------------------.-------------------------------. Grid 7: .-------------------------------.-------------------------------.-------------------------------. |
Author: | Børge [ Thu Apr 02, 2009 7:07 pm ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
enxio27 wrote: By g6 and g7, do you mean the center and rightmost grids in the center row? YES.As our host Richard once wrote: Grids are strictly numbered from top left to bottom right (except for Clueless Grids, which are always last) [But also numbered from top left to bottom right if there are more than one clueless grid]. enxio27 wrote: And by n4 do you mean r4-6 c1-3 ? What else? n4 is the de facto standard abbreviation for nonet 4. Nonets are also strictly numbered from top left to bottom right! Unfortunately I made a typo. I meant g6:n7 and not g6:n4. Sorry about that. But you have found the hidden pair in g6:n7. With g7:r4 I referred to the triplet and quad you have found. Based on your listed state for g6, JSudoku suggests that you have missed an Intersection on an even digit in g2, which results in Naked Singles in g2:r3c38. If you have those, you have forgotten to eliminate pencil marks after placing the solution in g2:r3c8. g2 and g6 shares a nonet, i.e. g2:n9≡g6:n1 Hope this helps. |
Author: | enxio27 [ Thu Apr 02, 2009 7:34 pm ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
Børge wrote: enxio27 wrote: By g6 and g7, do you mean the center and rightmost grids in the center row? YES.Børge wrote: enxio27 wrote: And by n4 do you mean r4-6 c1-3 ? n4 is the de facto standard abbreviation for nonet 4. OK, I wanted to make sure my numbering follows the standard. Quote: Based on your listed state for g6, JSudoku suggests that you have missed an Intersection on an even digit in g2, which results in Naked Singles in g2:r3c38. If you have those, you have forgotten to eliminate pencil marks after placing the solution in g2:r3c8. Boy, I sure don't see it! I went through g2 again, with special attention to the section you mentioned. I'm guessing that the intersection you mention is the 4 in r3c2 and r3c3, but I don't see what is eliminating the 4 in the rest of the nonet or the row. Here's what I have for g2: .-------------------------------.-------------------------------.-------------------------------. |
Author: | Børge [ Fri Apr 03, 2009 12:14 pm ] |
Post subject: | Re: Another Gattai-8 (enxio27 tuned) |
enxio27 wrote: I'm guessing that the intersection you mention is the 4 in r3c2 and r3c3, but I don't see what is eliminating the 4 in the rest of the nonet or the row No. I thought you had missed an intersection on 8 in g2, but you have not.When JSudoku deploys the Intersection on 8, its g6 and g7 states are pretty similar to yours. Its g2 is however quite a bit more developed than yours. Can it be that you have missed a Hidden Single in g5:c9 or g5:n9? If not, please check the following locations for Naked Subsets. JSudoku lists them prior to the Naked Quad in g7:r4 and the Hidden Pair in g6:n7. g1:n3 g7:n8 g7:n5 If none of this helps, please post the complete text based candidate grid for the complete puzzle, so that I can paste it into JSudoku. I will then post its next move as a vague hint. Before posting please verify that the complete text based candidate grid (from SudokuSolver I presume) is understood by JSudoku. It should look something like this: +----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+----------------------------+ |
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