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

This Sudoku Puzzle has 62 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Pair, Naked Single, Full House, Uniqueness Test 1, Finned Swordfish, undefined techniques.

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

Solution Steps:

  1. Row 1 / Column 6 → 9 (Hidden Single)
  2. Row 6 / Column 1 → 3 (Hidden Single)
  3. Row 9 / Column 9 → 4 (Hidden Single)
  4. Row 1 / Column 4 → 3 (Hidden Single)
  5. Row 5 / Column 2 → 1 (Hidden Single)
  6. Row 9 / Column 6 → 3 (Hidden Single)
  7. Row 4 / Column 2 → 4 (Hidden Single)
  8. Row 5 / Column 5 → 3 (Hidden Single)
  9. Row 6 / Column 7 → 4 (Hidden Single)
  10. Row 5 / Column 6 → 4 (Hidden Single)
  11. Row 3 / Column 5 → 4 (Hidden Single)
  12. Row 3 / Column 8 → 1 (Hidden Single)
  13. Row 2 / Column 5 → 1 (Hidden Single)
  14. Row 1 / Column 1 → 1 (Hidden Single)
  15. Row 6 / Column 9 → 1 (Hidden Single)
  16. Row 6 / Column 3 → 7 (Hidden Single)
  17. Row 4 / Column 9 → 7 (Hidden Single)
  18. Row 2 / Column 1 → 7 (Hidden Single)
  19. Row 5 / Column 4 → 7 (Hidden Single)
  20. Row 7 / Column 6 → 7 (Hidden Single)
  21. Row 9 / Column 2 → 7 (Hidden Single)
  22. Locked Candidates Type 1 (Pointing): 8 in b2 => r79c4<>8
  23. Locked Candidates Type 1 (Pointing): 9 in b7 => r8c7<>9
  24. Locked Pair: 5,6 in r8c79 => r7c789,r8c135,r9c8<>5, r7c789,r8c35,r9c8<>6
  25. Row 7 / Column 9 → 3 (Naked Single)
  26. Row 7 / Column 7 → 9 (Naked Single)
  27. Row 2 / Column 7 → 3 (Hidden Single)
  28. Row 5 / Column 8 → 9 (Hidden Single)
  29. Row 5 / Column 3 → 5 (Full House)
  30. Row 9 / Column 1 → 5 (Hidden Single)
  31. Uniqueness Test 1: 8/9 in r4c13,r8c13 => r8c3<>8, r8c3<>9
  32. Row 8 / Column 3 → 2 (Naked Single)
  33. Row 8 / Column 5 → 8 (Naked Single)
  34. Row 8 / Column 1 → 9 (Naked Single)
  35. Row 4 / Column 1 → 8 (Full House)
  36. Row 4 / Column 3 → 9 (Full House)
  37. Finned Swordfish: 5 c679 r248 fr3c6 => r2c4<>5
  38. Finned Swordfish: 6 c679 r248 fr3c6 => r2c4<>6
  39. W-Wing: 2/8 in r2c4,r9c8 connected by 8 in r29c3 => r9c4<>2
  40. Row 9 / Column 4 → 6 (Naked Single)
  41. Row 9 / Column 3 → 8 (Naked Single)
  42. Row 2 / Column 3 → 6 (Full House)
  43. Row 7 / Column 2 → 6 (Full House)
  44. Row 9 / Column 8 → 2 (Full House)
  45. Row 1 / Column 2 → 5 (Naked Single)
  46. Row 1 / Column 8 → 6 (Full House)
  47. Row 2 / Column 9 → 5 (Full House)
  48. Row 3 / Column 2 → 8 (Full House)
  49. Row 8 / Column 9 → 6 (Full House)
  50. Row 8 / Column 7 → 5 (Full House)
  51. Row 7 / Column 8 → 8 (Full House)
  52. Row 6 / Column 8 → 5 (Full House)
  53. Row 4 / Column 7 → 6 (Full House)
  54. Row 6 / Column 5 → 6 (Full House)
  55. Row 2 / Column 6 → 2 (Naked Single)
  56. Row 2 / Column 4 → 8 (Full House)
  57. Row 3 / Column 4 → 5 (Naked Single)
  58. Row 3 / Column 6 → 6 (Full House)
  59. Row 4 / Column 6 → 5 (Full House)
  60. Row 7 / Column 4 → 2 (Full House)
  61. Row 4 / Column 5 → 2 (Full House)
  62. Row 7 / Column 5 → 5 (Full House)
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