![]() The color of a guessed cell is initially red and it turns cyan once the solution is confirmed.Ģ. This happens solely when the board is not solvable as it has been given and several solutions exist for it. ![]() Red : the value needed to be guessed by trying one of the possibilities and solving the board further.Green : the value of the cell was obtained with advanced possibilities reduction approaches.Cyan : the value needed to be guessed (Nishio approach) during the resolution process.Dark blue : the value was the single possibility for the cell.The values in the cell are displayed in different colors depending on the way When launching the Sudoku solving tutorial, the Sudoku is solved cell after cellįollowing the human-like solving algorithm presented below. Several numbers separated by a space will set the possibilities for the cell.A number given alone will set the value for the cell.The user can click on a cell to give its value or set the possibilities for the cell: Clean : clean the grid completely (empty grid).Reset : reset grid as initially created / generated.Load Grid : load a previously saved grid.Solve BT : solve the Sudoku board using backtracking.Solve : solve the Sudoku board using human-like heuristics.Generate : generate a new random Sudoku board.The buttons on the bottom of the GUI have the following functions: The software presents a sudoku grid centered in its window. Happily only few adaptations should be required.įor all other platforms, the source code is available Need to adapt the makefile to your own Linux distribution (or on Windows Mingw, TDM, etc.). it can beĪ makefile is provided to build it, no configure scripts, i.e. It is cross-platform to the extent of the wxWidgets library, i.e. The software is written in C++ on Linux with the help of the Seconds while some other times it needs two minutes to generate an easy board. In some cases it generates an extremely difficult board (only solvable with nishio) in a few In addition, the difficulty of the resulting board is not tweakable at the moment. The problem I'm facing in this current version is that it can takeįrom a few seconds only up to several minutes to generate the board (this is discussed in ![]() Random initial situation (with all cells filled) of the board. ![]() most difficult) board it possibly can provided the (which is quite better than most generators I couldĬurrently it generates the best (i.e. It usually generates boardsīetween 18 and 22 pre-filled cells. The Sudoku board generator generates solvable Sudoku boards. Sudoku board takes a few milliseconds only.Ī solvable Sudoku board is a Sudoku board than has one and only one solution. Resolution techniques and a second using backtracking. You can practice this strategy by installing the free SudokuCoach application on your Android™ device.At the moment there are two resolution methods supported, one using human-like Hence 1 may not be the solution in A1 nor in C1 3 may not be the solution in B1, B3 nor in C1 4 may not be the solution in C1 finally, 5 may not be the solution in B3. Each of these candidates must be present in one of these cells. In the example above, cells A2, B2, C2 and C3 form a Naked Quad in Square "1": four cells with exactly four possible candidates. Hence none of these four candidates can be the solution in any other Cell of that region these four candidates can be deleted from the other Cells of that region. If four Cells in a region (Row, Column or Square) contain exactly the same four candidates or only subsets of these four candidates, then one of these candidates is the solution for the first of these Cells, a second one is the solution for the second of these Cells, a third one is the solution for the third of these Cells and the last candidate is the solution for the fourth Cell. ![]()
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