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

This Sudoku Puzzle has 60 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Swordfish, Naked Pair, Naked Single, 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 4 / Column 1 → 7 (Hidden Single)
  2. Row 8 / Column 9 → 7 (Hidden Single)
  3. Row 8 / Column 2 → 1 (Hidden Single)
  4. Locked Candidates Type 1 (Pointing): 5 in b5 => r6c79<>5
  5. Locked Candidates Type 1 (Pointing): 2 in b6 => r23c9<>2
  6. Locked Candidates Type 2 (Claiming): 3 in c2 => r13c3,r23c1<>3
  7. Naked Triple: 3,5,8 in r7c13,r8c1 => r9c3<>5, r9c3<>8
  8. Swordfish: 5 r258 c189 => r19c8,r7c19<>5
  9. Naked Pair: 4,8 in r9c58 => r9c46<>4, r9c67<>8
  10. Swordfish: 9 c258 r125 => r1c347,r25c9<>9
  11. Row 2 / Column 9 → 5 (Naked Single)
  12. Row 1 / Column 3 → 5 (Hidden Single)
  13. Row 8 / Column 1 → 5 (Hidden Single)
  14. Row 8 / Column 8 → 8 (Naked Single)
  15. Row 8 / Column 5 → 3 (Full House)
  16. Row 9 / Column 8 → 4 (Naked Single)
  17. Row 9 / Column 5 → 8 (Naked Single)
  18. Row 5 / Column 8 → 5 (Hidden Single)
  19. Row 1 / Column 7 → 8 (Hidden Single)
  20. Row 2 / Column 2 → 3 (Hidden Single)
  21. Row 5 / Column 9 → 8 (Hidden Single)
  22. Row 4 / Column 6 → 8 (Hidden Single)
  23. Row 3 / Column 7 → 3 (Hidden Single)
  24. Row 3 / Column 4 → 9 (Naked Single)
  25. Row 1 / Column 5 → 4 (Naked Single)
  26. Row 2 / Column 5 → 6 (Naked Single)
  27. Row 5 / Column 5 → 9 (Full House)
  28. Row 3 / Column 9 → 1 (Naked Single)
  29. Row 4 / Column 4 → 4 (Naked Single)
  30. Row 2 / Column 1 → 2 (Naked Single)
  31. Row 2 / Column 8 → 9 (Full House)
  32. Row 1 / Column 8 → 2 (Full House)
  33. Row 3 / Column 6 → 2 (Naked Single)
  34. Row 5 / Column 2 → 6 (Naked Single)
  35. Row 5 / Column 1 → 4 (Full House)
  36. Row 7 / Column 9 → 9 (Naked Single)
  37. Row 6 / Column 4 → 5 (Naked Single)
  38. Row 6 / Column 6 → 6 (Full House)
  39. Row 1 / Column 2 → 9 (Naked Single)
  40. Row 9 / Column 2 → 2 (Full House)
  41. Row 1 / Column 6 → 7 (Naked Single)
  42. Row 1 / Column 4 → 3 (Full House)
  43. Row 6 / Column 1 → 3 (Naked Single)
  44. Row 4 / Column 9 → 2 (Naked Single)
  45. Row 6 / Column 9 → 4 (Full House)
  46. Row 7 / Column 4 → 1 (Naked Single)
  47. Row 9 / Column 4 → 7 (Full House)
  48. Row 6 / Column 7 → 9 (Naked Single)
  49. Row 4 / Column 7 → 6 (Full House)
  50. Row 4 / Column 3 → 9 (Full House)
  51. Row 6 / Column 3 → 2 (Full House)
  52. Row 9 / Column 3 → 6 (Naked Single)
  53. Row 9 / Column 6 → 5 (Naked Single)
  54. Row 7 / Column 6 → 4 (Full House)
  55. Row 9 / Column 7 → 1 (Full House)
  56. Row 7 / Column 7 → 5 (Full House)
  57. Row 7 / Column 1 → 8 (Naked Single)
  58. Row 3 / Column 1 → 6 (Full House)
  59. Row 3 / Column 3 → 8 (Full House)
  60. Row 7 / Column 3 → 3 (Full House)
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