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

This Sudoku Puzzle has 60 steps and it is solved using Locked Triple, Naked Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Skyscraper, Hidden Single, Full House techniques.

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Solution Steps:

  1. Locked Triple: 1,4,5 in r456c7 => r37c7,r46c8,r5c9<>4, r5c9,r7c7<>1, r46c8<>5
  2. Row 5 / Column 9 → 3 (Naked Single)
  3. Row 5 / Column 3 → 5 (Naked Single)
  4. Locked Candidates Type 1 (Pointing): 2 in b4 => r3c3<>2
  5. Locked Candidates Type 1 (Pointing): 2 in b6 => r78c8<>2
  6. Locked Candidates Type 1 (Pointing): 7 in b6 => r2c8<>7
  7. Naked Pair: 1,4 in r5c17 => r5c46<>1, r5c6<>4
  8. X-Wing: 6 c37 r37 => r3c2568,r7c2458<>6
  9. Skyscraper: 6 in r1c2,r2c5 (connected by r8c25) => r1c46<>6
  10. Row 1 / Column 2 → 6 (Hidden Single)
  11. Row 3 / Column 7 → 6 (Hidden Single)
  12. Row 7 / Column 7 → 9 (Naked Single)
  13. Row 7 / Column 3 → 6 (Hidden Single)
  14. Row 3 / Column 2 → 8 (Hidden Single)
  15. Row 3 / Column 8 → 4 (Naked Single)
  16. Row 2 / Column 8 → 8 (Naked Single)
  17. Row 2 / Column 9 → 7 (Naked Single)
  18. Row 1 / Column 9 → 9 (Full House)
  19. Row 7 / Column 8 → 3 (Naked Single)
  20. Row 2 / Column 1 → 3 (Naked Single)
  21. Row 2 / Column 4 → 6 (Naked Single)
  22. Row 2 / Column 5 → 4 (Full House)
  23. Row 3 / Column 3 → 9 (Naked Single)
  24. Row 5 / Column 4 → 8 (Naked Single)
  25. Row 3 / Column 1 → 2 (Naked Single)
  26. Row 1 / Column 1 → 7 (Full House)
  27. Row 6 / Column 3 → 2 (Naked Single)
  28. Row 4 / Column 3 → 3 (Full House)
  29. Row 1 / Column 4 → 2 (Naked Single)
  30. Row 1 / Column 6 → 8 (Full House)
  31. Row 5 / Column 6 → 6 (Naked Single)
  32. Row 3 / Column 6 → 1 (Naked Single)
  33. Row 3 / Column 5 → 3 (Full House)
  34. Row 6 / Column 8 → 7 (Naked Single)
  35. Row 7 / Column 4 → 1 (Naked Single)
  36. Row 9 / Column 6 → 5 (Naked Single)
  37. Row 4 / Column 8 → 2 (Naked Single)
  38. Row 6 / Column 5 → 1 (Naked Single)
  39. Row 6 / Column 4 → 5 (Naked Single)
  40. Row 9 / Column 4 → 3 (Full House)
  41. Row 7 / Column 2 → 4 (Naked Single)
  42. Row 7 / Column 5 → 8 (Naked Single)
  43. Row 7 / Column 9 → 2 (Full House)
  44. Row 8 / Column 5 → 6 (Naked Single)
  45. Row 8 / Column 6 → 2 (Full House)
  46. Row 4 / Column 6 → 4 (Full House)
  47. Row 4 / Column 5 → 7 (Full House)
  48. Row 9 / Column 8 → 6 (Naked Single)
  49. Row 8 / Column 8 → 5 (Full House)
  50. Row 6 / Column 7 → 4 (Naked Single)
  51. Row 6 / Column 2 → 9 (Full House)
  52. Row 4 / Column 2 → 1 (Naked Single)
  53. Row 4 / Column 7 → 5 (Full House)
  54. Row 5 / Column 7 → 1 (Full House)
  55. Row 5 / Column 1 → 4 (Full House)
  56. Row 8 / Column 2 → 3 (Full House)
  57. Row 9 / Column 1 → 1 (Naked Single)
  58. Row 8 / Column 1 → 9 (Full House)
  59. Row 8 / Column 9 → 1 (Full House)
  60. Row 9 / Column 9 → 4 (Full House)
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