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

This Sudoku Puzzle has 66 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Naked Triple, Sue de Coq, Full House 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 2 → 6 (Naked Single)
  2. Row 3 / Column 3 → 1 (Hidden Single)
  3. Row 5 / Column 1 → 6 (Hidden Single)
  4. Row 1 / Column 5 → 6 (Hidden Single)
  5. Row 1 / Column 3 → 3 (Hidden Single)
  6. Row 7 / Column 3 → 5 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 4 in b2 => r3c1<>4
  8. Locked Candidates Type 1 (Pointing): 7 in b4 => r9c2<>7
  9. Locked Candidates Type 1 (Pointing): 9 in b4 => r9c3<>9
  10. Locked Candidates Type 1 (Pointing): 2 in b6 => r79c7<>2
  11. Locked Candidates Type 2 (Claiming): 7 in r5 => r4c78,r6c78<>7
  12. X-Wing: 3 r28 c68 => r3c6,r9c8<>3
  13. Row 3 / Column 6 → 4 (Naked Single)
  14. Naked Triple: 1,6,8 in r467c6 => r8c6<>1, r8c6<>8
  15. 2-String Kite: 5 in r2c8,r6c5 (connected by r2c4,r3c5) => r6c8<>5
  16. Sue de Coq: r5c789 - {14789} (r5c5 - {14}, r4c78,r6c7 - {2589}) => r6c8<>8
  17. XY-Chain: 5 5- r2c4 -9- r2c6 -3- r8c6 -9- r8c1 -8- r3c1 -5 => r3c45<>5
  18. Row 3 / Column 4 → 2 (Naked Single)
  19. Row 3 / Column 5 → 3 (Naked Single)
  20. Row 2 / Column 6 → 9 (Naked Single)
  21. Row 2 / Column 4 → 5 (Full House)
  22. Row 2 / Column 8 → 3 (Full House)
  23. Row 8 / Column 6 → 3 (Naked Single)
  24. Row 6 / Column 5 → 5 (Hidden Single)
  25. Row 9 / Column 7 → 3 (Hidden Single)
  26. Row 9 / Column 4 → 6 (Hidden Single)
  27. Row 7 / Column 7 → 6 (Hidden Single)
  28. Row 4 / Column 6 → 6 (Hidden Single)
  29. Row 9 / Column 1 → 9 (Hidden Single)
  30. Row 8 / Column 1 → 8 (Naked Single)
  31. Row 3 / Column 1 → 5 (Naked Single)
  32. Row 8 / Column 4 → 9 (Naked Single)
  33. Row 9 / Column 3 → 2 (Naked Single)
  34. Row 1 / Column 1 → 4 (Naked Single)
  35. Row 1 / Column 2 → 8 (Full House)
  36. Row 7 / Column 1 → 7 (Full House)
  37. Row 8 / Column 2 → 1 (Naked Single)
  38. Row 9 / Column 2 → 4 (Full House)
  39. Row 8 / Column 8 → 5 (Naked Single)
  40. Row 8 / Column 9 → 2 (Full House)
  41. Row 9 / Column 5 → 1 (Naked Single)
  42. Row 4 / Column 8 → 8 (Naked Single)
  43. Row 5 / Column 5 → 4 (Naked Single)
  44. Row 7 / Column 5 → 2 (Full House)
  45. Row 7 / Column 6 → 8 (Naked Single)
  46. Row 6 / Column 6 → 1 (Full House)
  47. Row 7 / Column 4 → 4 (Full House)
  48. Row 7 / Column 9 → 1 (Full House)
  49. Row 4 / Column 4 → 7 (Naked Single)
  50. Row 6 / Column 4 → 8 (Full House)
  51. Row 9 / Column 8 → 7 (Naked Single)
  52. Row 9 / Column 9 → 8 (Full House)
  53. Row 6 / Column 8 → 4 (Naked Single)
  54. Row 5 / Column 8 → 1 (Full House)
  55. Row 4 / Column 2 → 2 (Naked Single)
  56. Row 4 / Column 7 → 5 (Full House)
  57. Row 6 / Column 2 → 7 (Full House)
  58. Row 6 / Column 3 → 9 (Naked Single)
  59. Row 5 / Column 3 → 8 (Full House)
  60. Row 6 / Column 7 → 2 (Full House)
  61. Row 3 / Column 9 → 7 (Naked Single)
  62. Row 3 / Column 7 → 8 (Full House)
  63. Row 1 / Column 7 → 9 (Naked Single)
  64. Row 1 / Column 9 → 5 (Full House)
  65. Row 5 / Column 9 → 9 (Full House)
  66. Row 5 / Column 7 → 7 (Full House)
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