MainpageFractalsBirthprimesWordBabygenTexturizeProgramsPhonewordData MatrixMap
SudokuSudokutoWordokuCodokuSudoku3DSudokuGTKakuroFillominoHitoriArukone
HashiShuffleBogglemPuzzleCalcuDokuSangerBitcoin

DC: Disjoint Chain

Look at a row, column or box and see if you find x cells containing x numbers. Eg 3 cells [1,3], [1,5], [3,5]. These 3 cells containts the numbers 1,3,5. Therefore 1,3 and 5 must be the solution for these cells, and we can remove them from row, column or box. Here is a sudoku solved as far as possible with the other methods.

  5   1 6 9 4    
      3 5 4     1
1   4 2 8 7   6 5
6 4 3 7 2 1 8 5 9
8     9 3 5 1 4 6
5 1 9 8 4 6 7 2 3
9     5 7 2   1 4
4   1 6 9 3 5    
    5 4 1 8      

here is the solution table this far. R7C2, R7C3 and R9C2 containts the numbers 3, 6 and 8. Therefore we can remove these numbers from the rest of the box. In this case we can remove 3 from R8C1.

237 5 278 1 6 9 4 378 278
27 689 2678 3 5 4 29 789 1
1 39 4 2 8 7 39 6 5
6 4 3 7 2 1 8 5 9
8 27 27 9 3 5 1 4 6
5 1 9 8 4 6 7 2 3
9 368 68 5 7 2 36 1 4
4 27 1 6 9 3 5 78 278
237 36 5 4 1 8 2369 379 27

By continue using DC on B9 you will be able to solve this sudoku using the other reducing methods.