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

This Sudoku Puzzle has 37 steps and it is solved using Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Naked Single, Uniqueness Test 6, Give Up techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 6 → 4 (Hidden Single)
  2. Row 3 / Column 4 → 1 (Hidden Single)
  3. Row 6 / Column 4 → 8 (Hidden Single)
  4. Row 4 / Column 2 → 4 (Hidden Single)
  5. Row 9 / Column 5 → 4 (Hidden Single)
  6. Row 6 / Column 2 → 7 (Hidden Single)
  7. Row 7 / Column 9 → 2 (Hidden Single)
  8. Row 1 / Column 2 → 3 (Hidden Single)
  9. Row 4 / Column 3 → 1 (Hidden Single)
  10. Row 1 / Column 7 → 9 (Hidden Single)
  11. Row 8 / Column 4 → 9 (Hidden Single)
  12. Row 4 / Column 4 → 6 (Full House)
  13. Row 2 / Column 9 → 1 (Hidden Single)
  14. Row 9 / Column 2 → 1 (Hidden Single)
  15. Row 8 / Column 5 → 1 (Hidden Single)
  16. Row 5 / Column 7 → 1 (Hidden Single)
  17. Locked Candidates Type 1 (Pointing): 3 in b6 => r8c8<>3
  18. Locked Candidates Type 1 (Pointing): 5 in b9 => r8c2<>5
  19. Locked Candidates Type 2 (Claiming): 2 in r4 => r56c8<>2
  20. XY-Chain: 2 2- r5c2 -6- r5c1 -9- r7c1 -6- r7c5 -3- r6c5 -2 => r5c5,r6c3<>2
  21. Row 6 / Column 3 → 9 (Naked Single)
  22. Row 5 / Column 1 → 6 (Naked Single)
  23. Row 5 / Column 2 → 2 (Full House)
  24. Row 7 / Column 1 → 9 (Full House)
  25. Row 6 / Column 8 → 3 (Naked Single)
  26. Row 6 / Column 5 → 2 (Full House)
  27. W-Wing: 5/6 in r3c6,r7c3 connected by 6 in r17c5 => r3c3<>5
  28. Locked Candidates Type 1 (Pointing): 5 in b1 => r2c78<>5
  29. Uniqueness Test 6: 5/6 in r2c23,r7c23 => r2c3,r7c2<>5
  30. Row 2 / Column 2 → 5 (Hidden Single)
  31. Row 7 / Column 3 → 5 (Hidden Single)
  32. Uniqueness Test 6: 5/9 in r4c68,r5c68 => r4c8,r5c6<>9
  33. Row 4 / Column 6 → 9 (Hidden Single)
  34. Row 5 / Column 8 → 9 (Hidden Single)
  35. XY-Chain: 5 5- r3c6 -6- r9c6 -8- r9c7 -7- r2c7 -2- r4c7 -5 => r3c7<>5
  36. Locked Candidates Type 1 (Pointing): 5 in b3 => r8c9<>5
  37. Give Up: Don't know how to proceed!
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