![]() Apart from this I memorize locations of pairs and triplets, but the rest of the information about each cell I put aside as soon that I can see that it doesnt help me at the moment. Only when I make a reduction through some other technique, like x-wing, uniqueness etc., I memorize the reduced candidates. As most of the impossibles can be read from the column, row and box of each cell, there isnt really that much to remember. ![]() Instead of memorizing possible candidates, I memorize impossible candidates. So what Im interrested in is these reduced possibilities. ![]() Most puzzles can be solved exclusively with naked or hidden singles, then what's the point in knowing that a cell can hold numbers 1,2,6 and 7? In fact, all numbers are solved by naked or hidden singles, all other techniques only reduce possibilities. When I finally realised that this is pointless, my solving improved significantly. When I started doing Sudoku I often found myself trying to memorize possible values for cells, drawing a mental pencilmarkgrid. There is simply so much information to be found in any grid, that one can't remember it all. The most important thing I've learned so far is to choose what information to memorize. My answer is yes, but I hardly ever use it. If anybody else has got any good tips on solving without pencilmarks, please post them here and we can try to make a little collection of these techniques.įirst of all, whenever I say that I solve without pencilmarks, peoples first reaction is: "then you must have a really good memory". ![]() First I'll give you some tips that I've found usefull, then I'll take you through a step by step solution of a couple of extreme puzzles, the way I solve them, and hope that you can follow without making any own pencilmarks. Now I wish to show you that none of those are true. I often read comments like "no other than the easiest puzzles can be solved without pencilmarks" or "techniques that are impossible for human solvers.". To print multiple puzzles, there are special pages to print two, four, or six puzzles per page.The more I read posts on this forum, the more I get the feeling that I'm the only person in the world who solve exclusively without pencilmarks, regardless off difficulty. Guessing is never required - but it may help! Each puzzle has a unique solution and can be solved with pure logic. The position is saved as 81 digits at the end of the URL string, with hyphens used for empty cells.Įxtreme Sudoku posts five new puzzles every day. To save any position, right-click on under the grid, and click Add To Favorites or Bookmark This Link. You can add symbols too, such as question marks. If you prefer to enter your own pencilmarks, up to six digits can be entered in each cell. These update by themselves as you solve particular cells and cannot be edited manually. There are automatic pencilmarks that appear if you check the Pencilmarks box. So it's possible to have incorrect digits that don't conflict, but eventually you will get stuck. The Show Conflicts button does not apply the solving logic - just checks whether there are any conflicting digits already in the grid. To print the puzzles use either the Print button below the grid, or if you want to print the pencilmarks as well, use the browser Print option under the File menu. See our guide to solution rules for hard sudoku puzzles.Īll the puzzles on this site rate a "fiendish" category, but then we picked the hardest, and graded them in five progressively more difficult categories: Evil, Excessive, Egregious, Excruciating, and Extreme, in order from least difficult to most difficult. Difficulty depends on the type of steps required to solve them, and also on the number of each type of step. Solving these puzzles is a different matter entirely, since these are the most difficult puzzles we create. Each row, column, and 3 x 3 box must contain only one of each of the 9 digits. Just place the digits from 1 to 9 in each empty cell. Then try some of our very hard sudoku puzzles.
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