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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, Naked Single, Hidden Rectangle, undefined, Full House techniques.

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

Solution Steps:

  1. Row 6 / Column 7 → 9 (Hidden Single)
  2. Row 9 / Column 5 → 8 (Hidden Single)
  3. Row 4 / Column 1 → 8 (Hidden Single)
  4. Row 5 / Column 6 → 5 (Hidden Single)
  5. Row 3 / Column 6 → 4 (Hidden Single)
  6. Row 5 / Column 4 → 4 (Hidden Single)
  7. Row 9 / Column 6 → 7 (Hidden Single)
  8. Row 2 / Column 5 → 9 (Hidden Single)
  9. Row 8 / Column 5 → 1 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 2 in b3 => r45c8<>2
  11. Naked Pair: 3,6 in r7c14 => r7c28<>3, r7c2678<>6
  12. Row 7 / Column 6 → 9 (Naked Single)
  13. Row 7 / Column 2 → 1 (Naked Single)
  14. Row 9 / Column 8 → 9 (Hidden Single)
  15. Row 8 / Column 3 → 9 (Hidden Single)
  16. Row 3 / Column 2 → 9 (Hidden Single)
  17. Row 5 / Column 8 → 3 (Hidden Single)
  18. Row 5 / Column 2 → 6 (Naked Single)
  19. Row 1 / Column 2 → 5 (Naked Single)
  20. Row 3 / Column 4 → 7 (Hidden Single)
  21. Row 2 / Column 1 → 7 (Hidden Single)
  22. Row 3 / Column 8 → 2 (Hidden Single)
  23. Row 2 / Column 3 → 3 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 6 in b1 => r9c3<>6
  25. Locked Candidates Type 1 (Pointing): 4 in b7 => r9c79<>4
  26. Hidden Rectangle: 4/6 in r2c79,r8c79 => r2c9<>6
  27. XY-Chain: 6 6- r7c1 -3- r6c1 -2- r5c3 -1- r5c9 -8- r3c9 -6- r3c3 -8- r1c3 -6- r1c6 -2- r8c6 -6 => r7c4,r8c1<>6
  28. Row 7 / Column 4 → 3 (Naked Single)
  29. Row 7 / Column 1 → 6 (Naked Single)
  30. XY-Chain: 2 2- r1c6 -6- r1c3 -8- r3c3 -6- r3c9 -8- r5c9 -1- r5c3 -2- r6c1 -3- r8c1 -2- r8c6 -6- r9c4 -2 => r1c4,r8c6<>2
  31. Row 8 / Column 6 → 6 (Naked Single)
  32. Row 1 / Column 6 → 2 (Full House)
  33. Row 9 / Column 4 → 2 (Full House)
  34. Row 8 / Column 7 → 4 (Naked Single)
  35. Row 9 / Column 3 → 4 (Naked Single)
  36. Row 8 / Column 9 → 3 (Naked Single)
  37. Row 8 / Column 1 → 2 (Full House)
  38. Row 9 / Column 2 → 3 (Full House)
  39. Row 6 / Column 1 → 3 (Full House)
  40. Row 6 / Column 2 → 7 (Naked Single)
  41. Row 4 / Column 2 → 4 (Full House)
  42. Row 2 / Column 9 → 4 (Hidden Single)
  43. Row 4 / Column 9 → 7 (Hidden Single)
  44. Row 6 / Column 9 → 5 (Hidden Single)
  45. Row 6 / Column 3 → 2 (Naked Single)
  46. Row 6 / Column 5 → 6 (Full House)
  47. Row 4 / Column 5 → 2 (Full House)
  48. Row 5 / Column 3 → 1 (Naked Single)
  49. Row 4 / Column 3 → 5 (Full House)
  50. Row 5 / Column 9 → 8 (Naked Single)
  51. Row 5 / Column 7 → 2 (Full House)
  52. Row 3 / Column 9 → 6 (Naked Single)
  53. Row 3 / Column 3 → 8 (Full House)
  54. Row 9 / Column 9 → 1 (Full House)
  55. Row 1 / Column 3 → 6 (Full House)
  56. Row 9 / Column 7 → 6 (Full House)
  57. Row 1 / Column 4 → 1 (Naked Single)
  58. Row 1 / Column 8 → 8 (Full House)
  59. Row 2 / Column 4 → 6 (Full House)
  60. Row 4 / Column 7 → 1 (Naked Single)
  61. Row 4 / Column 8 → 6 (Full House)
  62. Row 7 / Column 8 → 5 (Naked Single)
  63. Row 2 / Column 8 → 1 (Full House)
  64. Row 2 / Column 7 → 5 (Full House)
  65. Row 7 / Column 7 → 8 (Full House)
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