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

This Sudoku Puzzle has 47 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Empty Rectangle, undefined techniques.

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

Solution Steps:

  1. Row 6 / Column 2 → 1 (Naked Single)
  2. Row 4 / Column 3 → 2 (Full House)
  3. Row 7 / Column 7 → 7 (Hidden Single)
  4. Locked Candidates Type 1 (Pointing): 9 in b7 => r2c1<>9
  5. Locked Candidates Type 1 (Pointing): 2 in b8 => r1c4<>2
  6. Locked Candidates Type 1 (Pointing): 4 in b8 => r146c4<>4
  7. Naked Pair: 2,8 in r37c2 => r1c2<>2, r2c2<>8
  8. Row 1 / Column 6 → 2 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 8 in b1 => r3c6<>8
  10. Naked Pair: 1,4 in r34c6 => r2c6<>1, r26c6<>4
  11. Empty Rectangle: 5 in b8 (r1c34) => r8c3<>5
  12. W-Wing: 5/1 in r1c4,r2c1 connected by 1 in r12c7 => r1c3,r2c56<>5
  13. Row 2 / Column 6 → 8 (Naked Single)
  14. Row 2 / Column 5 → 4 (Naked Single)
  15. Row 6 / Column 6 → 5 (Naked Single)
  16. Row 3 / Column 6 → 1 (Naked Single)
  17. Row 1 / Column 4 → 5 (Full House)
  18. Row 4 / Column 6 → 4 (Full House)
  19. Row 6 / Column 5 → 8 (Naked Single)
  20. Row 8 / Column 5 → 5 (Full House)
  21. Row 3 / Column 1 → 2 (Naked Single)
  22. Row 4 / Column 8 → 9 (Naked Single)
  23. Row 4 / Column 4 → 1 (Full House)
  24. Row 6 / Column 4 → 9 (Full House)
  25. Row 6 / Column 8 → 4 (Full House)
  26. Row 3 / Column 2 → 8 (Naked Single)
  27. Row 3 / Column 3 → 4 (Full House)
  28. Row 7 / Column 2 → 2 (Naked Single)
  29. Row 1 / Column 3 → 1 (Naked Single)
  30. Row 2 / Column 1 → 5 (Naked Single)
  31. Row 8 / Column 3 → 8 (Naked Single)
  32. Row 9 / Column 3 → 5 (Full House)
  33. Row 9 / Column 1 → 9 (Naked Single)
  34. Row 8 / Column 1 → 1 (Full House)
  35. Row 8 / Column 4 → 2 (Naked Single)
  36. Row 8 / Column 9 → 9 (Full House)
  37. Row 9 / Column 7 → 4 (Naked Single)
  38. Row 2 / Column 9 → 6 (Naked Single)
  39. Row 1 / Column 7 → 9 (Naked Single)
  40. Row 2 / Column 7 → 1 (Full House)
  41. Row 1 / Column 9 → 4 (Full House)
  42. Row 2 / Column 2 → 9 (Full House)
  43. Row 1 / Column 2 → 6 (Full House)
  44. Row 7 / Column 9 → 8 (Naked Single)
  45. Row 7 / Column 4 → 4 (Full House)
  46. Row 9 / Column 4 → 8 (Full House)
  47. Row 9 / Column 9 → 2 (Full House)
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