![]() ![]() How can I write the elimination strategy to improve performance while still be able to solve the Sudoku? However that doesn't work since sometimes the algorithm keeps returning the same position although it was already filled. ![]() If current_number_row > max_num_row and current_number_row max_num_col and current_number_column < 9: My basic idea was to check which row+column combination has the least possibilities (the most numbers around) While reading norwigs book on algos I've stumbled upon eliminatiion strategy which I would like to try applying in the solver. The current implementation is: for x in range(9): You can browse Pleasanton Child Care for protective environments for your kids.Suppose I have Sudoku array which is used in Sudoku solver such as: Īnd I have a method nextMove() which for now returns next coordinates the solver has to check The ones above are basic to advanced level Sudoku solving techniques, especially for cracking a puzzle you’re stuck at. There are more challenging and complicated strategies, including XYZ-Wing, 3D Medusa, and X-Cycles, but that’s a whole different discussion topic. In short order, you’ll find that they’ll start to come naturally to you. In each game, focus on mastering one strategy, and then move on to the next. So that’s it! Now it’s time to start practicing these Sudoku problem solving strategies on sites like Solitaired, where you can play unlimited Sudoku games at various difficulty levels to refine your skills. Whichever value is chosen for one, the other cell is forced to be of another value. It allows you to look at cells that exactly contain two numbers as candidates. This one’s not too easy to use, but it precisely tells you what number a particular cell would hold. This way, you can eliminate candidates on the column except for the ones making a swordfish. Where the columns may contain more than three candidates, rows may not. But it’s a master technique for advanced puzzles. Swordfish is a complex version of X-Wing. X-Wing is a pattern spanning multiple columns and rows claiming the candidates to be eliminated from other relevant rows and columns. This technique works with cells forming a rectangle, and it also occurs in rare situations. If you use computer assistance to get a complete candidate listing for all cells, these are the ones with specific numbers hidden amongst other candidates for those cells. Instead of affecting cells of other rows, columns, and boxes, hidden subset impacts the pair/ triplet/ quad of the same subset. So if two cells have the same two candidates in a row, column or box, they can be excluded from the cells of another row, column, or box. You can quickly and efficiently spot naked subsets (pair/ triplet/ quad) when all the remaining candidates have been placed. This technique concerns the cells containing only a specific number of candidates. So if a particular digit can be placed in a said row, column, or box, it’s a perfect fit. It’s like when all possibilities are eliminated after scanning, only one choice remains, and that’ll be the correct value.įollowing Sudoku’s one rule where each box, row, and column must contain digits 1 to 9 without repetition, the single candidate/ hidden single applies. When all other digits, except the possible candidate, fall under the current row, column, or box, it’s a sole candidate (naked single). ![]() This happens when particular cells contain a single number. So, make use of these simple yet surefire strategies if you ever get stuck: ![]() You may succeed once, but it isn’t always the case. We know how it feels after making most moves by pure luck and not logic. If you’re one those players who hate guessing at Sudoku, try these Sudoku solving techniques instead. ![]()
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