I have concluded(with the help of cross hatching) that 7 and 8 can only be in two places in the lower left region(i filled both in). the method for candidate elimination I'm showing now is the matched pair method.This method happens when a pair of numbers are the only possible answer to two cells. It's slow progress and i don't like to erase that much. I will not be showing the what if to you because i don't like it. This is because all the other numbers are already present in its 3×3 region or the rows/columns connecting with that cell.įor a summary of further sudoku solving strategies, try this video:įor more solving ideas, you can visit the sudoku techniques section of Kristanix, a Norwegian game company, or Cracking the Cryptic, a reputed YouTube channel dedicated to logic games.Analysis consists of two methods namely candidate elimination and the what if.
Look for individual rows and columns that are nearly full.This helps you make quick deductions while filling every other 3×3 grid, preventing mistakes later. Another technique while solving on paper is to mark cells in every 3×3 region where a certain number can go, by writing it in a small size in the corner.This technique is called cross-hatching:Įxample of cross-hatching while trying the find the placement of a ‘1’ in a 3×3 grid. When done on paper, you can draw lines marking these rows and columns. While filling each cell in a 3×3 region, scan all the rows and columns that pass through it, and note numbers that are already pre-filled.Starting by filling all the 1s, then the 2s, and so on. Alternatively, you could also pick consecutive numbers. Pick the most commonly appearing number across the whole grid, and try to find its place within each 3×3 grid.Pick a 3×3 region to fill, one by one, instead of attempting the whole 9×9 grid at once.Regardless of the medium, these solving techniques should work on every classic grid you play: You might love going old school with pen and paper, but s udoku is now popularly played online, with auto-checker tools helping build confidence. If you’d like a deep dive into all the possibilities, this Glossary of Sudoku is a good starting point.
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Each grid shares one 3×3 region with another grid.Ĭompetitive events, such as the Indian qualifiers for the World Sudoku Championships, have an interesting mix of variants that a solver must crack as fast as possible. Samurai Sudoku: Five 9×9 classic grids that overlap at their corners. The grid’s diagonals may form a hidden word. Wordoku: Classic sudoku but with alphabets in place of numbers.
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These regions resemble four windows in a frame, hence the name: Example of a windoku puzzle with shaded interior regions. The digits 1–9 must appear in the shaded regions only once.
Windoku or Hyper Sudoku: Classic grid with 3×3 regions, but with four additional shaded 3×3 regions in the middle. Trending | After 11 years of trying, Mumbaikar wins India’s first silver at World Puzzle Championship
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