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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Single, Full House, Naked Triple, 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 3 → 2 (Hidden Single)
  2. Row 7 / Column 8 → 2 (Hidden Single)
  3. Row 3 / Column 2 → 2 (Hidden Single)
  4. Row 8 / Column 4 → 8 (Hidden Single)
  5. Row 2 / Column 5 → 2 (Hidden Single)
  6. Row 4 / Column 3 → 9 (Hidden Single)
  7. Row 9 / Column 8 → 9 (Hidden Single)
  8. Locked Pair: 4,7 in r5c46 => r46c5,r5c28,r6c6<>7, r5c8,r6c6<>4
  9. Locked Candidates Type 1 (Pointing): 3 in b1 => r2c79<>3
  10. Locked Candidates Type 1 (Pointing): 6 in b1 => r1c46<>6
  11. Locked Candidates Type 1 (Pointing): 1 in b2 => r79c6<>1
  12. Row 9 / Column 2 → 1 (Hidden Single)
  13. Row 4 / Column 2 → 7 (Naked Single)
  14. Row 5 / Column 2 → 3 (Naked Single)
  15. Row 5 / Column 8 → 1 (Naked Single)
  16. Row 6 / Column 1 → 4 (Naked Single)
  17. Row 4 / Column 1 → 1 (Full House)
  18. Row 7 / Column 2 → 5 (Naked Single)
  19. Row 1 / Column 2 → 6 (Full House)
  20. Row 4 / Column 7 → 5 (Naked Single)
  21. Row 4 / Column 5 → 6 (Naked Single)
  22. Row 8 / Column 5 → 5 (Hidden Single)
  23. Row 3 / Column 5 → 7 (Naked Single)
  24. Row 6 / Column 5 → 9 (Naked Single)
  25. Row 7 / Column 5 → 1 (Full House)
  26. Row 6 / Column 6 → 5 (Naked Single)
  27. Row 6 / Column 9 → 6 (Hidden Single)
  28. Row 8 / Column 3 → 6 (Hidden Single)
  29. Row 7 / Column 3 → 4 (Hidden Single)
  30. Naked Triple: 5,7,8 in r1c138 => r1c4<>5, r1c6<>8, r1c7<>7
  31. W-Wing: 7/3 in r6c8,r7c9 connected by 3 in r3c89 => r8c8<>7
  32. XY-Chain: 9 9- r2c4 -5- r3c4 -6- r3c6 -8- r3c9 -3- r7c9 -7- r7c6 -9 => r12c6,r7c4<>9
  33. Row 7 / Column 6 → 9 (Hidden Single)
  34. XY-Chain: 7 7- r7c9 -3- r3c9 -8- r3c6 -6- r9c6 -7- r9c3 -3- r8c1 -7 => r8c79<>7
  35. Row 8 / Column 1 → 7 (Hidden Single)
  36. Row 9 / Column 3 → 3 (Full House)
  37. Row 1 / Column 1 → 5 (Naked Single)
  38. Row 2 / Column 1 → 3 (Full House)
  39. Row 7 / Column 9 → 7 (Hidden Single)
  40. Row 7 / Column 4 → 3 (Full House)
  41. Row 3 / Column 8 → 5 (Hidden Single)
  42. Row 3 / Column 4 → 6 (Naked Single)
  43. Row 3 / Column 6 → 8 (Naked Single)
  44. Row 3 / Column 9 → 3 (Full House)
  45. Row 9 / Column 4 → 7 (Naked Single)
  46. Row 9 / Column 6 → 6 (Full House)
  47. Row 2 / Column 6 → 1 (Naked Single)
  48. Row 5 / Column 4 → 4 (Naked Single)
  49. Row 5 / Column 6 → 7 (Full House)
  50. Row 1 / Column 6 → 4 (Full House)
  51. Row 2 / Column 9 → 8 (Naked Single)
  52. Row 1 / Column 4 → 9 (Naked Single)
  53. Row 2 / Column 4 → 5 (Full House)
  54. Row 1 / Column 8 → 7 (Naked Single)
  55. Row 2 / Column 3 → 7 (Naked Single)
  56. Row 1 / Column 3 → 8 (Full House)
  57. Row 1 / Column 7 → 1 (Full House)
  58. Row 2 / Column 7 → 9 (Full House)
  59. Row 4 / Column 9 → 4 (Naked Single)
  60. Row 4 / Column 8 → 8 (Full House)
  61. Row 8 / Column 9 → 1 (Full House)
  62. Row 6 / Column 8 → 3 (Naked Single)
  63. Row 6 / Column 7 → 7 (Full House)
  64. Row 8 / Column 7 → 3 (Full House)
  65. Row 8 / Column 8 → 4 (Full House)
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