A solver for Sudoku puzzles that uses common solving techniques. The solver shows for every step which technique was used, so you can follow along how the puzzle was solved. You can use this for learning techniques or to get a hint for the Sudoku you are stuck on.
Try out the Sudoku solver on xwingsudoku.com.
The website is implemented using Blazor Webassembly, which allows running c# code on the client side in the browser without a backend server.
The following techniques are implemented so far. Each technique can individually be added to the solver.
| Technique | Usage |
|---|---|
| Basic Techniques | |
| Each value can only appear once per row/column/box. | Technique.EliminationByValue.AllDirections() |
| Subset Techniques | |
| Naked Single | Technique.Subsets.NakedSingle() |
| Naked Pair | Technique.Subsets.NakedPairs() |
| Naked Triple | Technique.Subsets.NakedTriples() |
| Naked Quad | Technique.Subsets.NakedQuads() |
| Hidden Single | Technique.Subsets.HiddenSingles() |
| Hidden Pair | Technique.Subsets.HiddenPairs() |
| Hidden Triple | Technique.Subsets.HiddenTriples() |
| Hidden Quad | Technique.Subsets.HiddenQuads() |
| Intersection Techniques | |
| Locked Candidates Pointing | Technique.LockedCandidates.Pointing.AllDirections() |
| Locked Candidates Claiming | Technique.LockedCandidates.Claiming.AllDirections() |
| Coloring Techniques | |
| Simple Coloring | Technique.Colors.SimpleColoring() |
| Fish Techniques | |
| 2-Fish: X-Wing, Finned X-Wing, Sashimi X-Wing | Technique.Fish.XWing() |
| 3-Fish: SwordFish, Finned Swordfish, Sashimi Swordfish | Technique.Fish.Swordfish() |
| 4-Fish: Jellyfish, Finned Jellyfish, Sashimi Jellyfish | Technique.Fish.Jellyfish() |
| Wing Techniques | |
| XY-Wing | Technique.Wings.XyWing() |
| XYZ-Wing | Technique.Wings.XyzWing() |
| WXYZ-Wing | Technique.Wings.WxyzWing() |
The Sudoku solver library is also utilized in a simple console application, which can be run to quickly solve a single step or an entire Sudoku.
Install .NET 5 SDK or newer to be able to build the projects.
cd src/Site
dotnet runThen browse the site locally at https://localhost:5001.
cd src/SudokuConsole
dotnet buildTo solve a Sudoku completely, just provide the path to a Sudoku input file.
./bin/Debug/net5.0/SudokuConsole.exe -i ../../inputs/sudoku-basic1.txtTo solve only the next step of an in-progress sudoku, you can use the --nextStep flag.
./bin/Debug/net5.0/SudokuConsole.exe -i ../../inputs/withCandidates/sudoku-evil1.txt --nextStep