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

This Sudoku Puzzle has 65 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Swordfish, Naked Pair, undefined, 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 6 / Column 4 → 2 (Naked Single)
  2. Row 9 / Column 1 → 6 (Hidden Single)
  3. Row 4 / Column 8 → 2 (Hidden Single)
  4. Locked Candidates Type 1 (Pointing): 8 in b4 => r4c7<>8
  5. Locked Candidates Type 1 (Pointing): 6 in b5 => r4c7<>6
  6. Locked Candidates Type 2 (Claiming): 4 in c8 => r7c79,r89c7,r9c9<>4
  7. Naked Triple: 3,4,9 in r459c5 => r137c5<>4, r17c5<>9, r7c5<>3
  8. Row 7 / Column 5 → 8 (Naked Single)
  9. Locked Candidates Type 1 (Pointing): 4 in b2 => r478c6<>4
  10. Row 7 / Column 2 → 4 (Hidden Single)
  11. Row 1 / Column 2 → 2 (Hidden Single)
  12. Row 1 / Column 5 → 7 (Naked Single)
  13. Row 3 / Column 5 → 2 (Naked Single)
  14. Locked Candidates Type 2 (Claiming): 8 in c9 => r13c7,r2c8<>8
  15. Row 2 / Column 8 → 7 (Naked Single)
  16. Row 9 / Column 8 → 4 (Naked Single)
  17. Row 3 / Column 3 → 7 (Hidden Single)
  18. Row 9 / Column 9 → 7 (Hidden Single)
  19. Row 8 / Column 4 → 4 (Hidden Single)
  20. Swordfish: 1 c268 r468 => r4c137,r68c7,r8c3<>1
  21. Naked Pair: 5,8 in r4c13 => r4c2<>5
  22. XY-Chain: 4 4- r4c7 -7- r6c7 -8- r6c8 -1- r6c6 -3- r5c5 -4 => r4c5,r5c79<>4
  23. Row 4 / Column 5 → 9 (Naked Single)
  24. Row 4 / Column 4 → 6 (Naked Single)
  25. Row 2 / Column 4 → 9 (Full House)
  26. Row 9 / Column 5 → 3 (Naked Single)
  27. Row 5 / Column 5 → 4 (Full House)
  28. Row 4 / Column 6 → 1 (Naked Single)
  29. Row 6 / Column 6 → 3 (Full House)
  30. Row 4 / Column 2 → 7 (Naked Single)
  31. Row 4 / Column 7 → 4 (Naked Single)
  32. Row 6 / Column 2 → 1 (Naked Single)
  33. Row 6 / Column 8 → 8 (Naked Single)
  34. Row 6 / Column 7 → 7 (Full House)
  35. Row 8 / Column 8 → 1 (Full House)
  36. Row 7 / Column 9 → 5 (Naked Single)
  37. Row 7 / Column 6 → 9 (Naked Single)
  38. Row 8 / Column 6 → 5 (Full House)
  39. Row 9 / Column 7 → 9 (Naked Single)
  40. Row 9 / Column 3 → 5 (Full House)
  41. Row 7 / Column 7 → 3 (Naked Single)
  42. Row 8 / Column 7 → 8 (Full House)
  43. Row 8 / Column 2 → 3 (Naked Single)
  44. Row 2 / Column 2 → 5 (Full House)
  45. Row 8 / Column 3 → 9 (Full House)
  46. Row 4 / Column 3 → 8 (Naked Single)
  47. Row 4 / Column 1 → 5 (Full House)
  48. Row 1 / Column 3 → 1 (Naked Single)
  49. Row 1 / Column 7 → 6 (Naked Single)
  50. Row 3 / Column 1 → 8 (Naked Single)
  51. Row 7 / Column 3 → 2 (Naked Single)
  52. Row 5 / Column 3 → 3 (Full House)
  53. Row 7 / Column 1 → 1 (Full House)
  54. Row 5 / Column 1 → 2 (Full House)
  55. Row 2 / Column 9 → 8 (Naked Single)
  56. Row 5 / Column 7 → 1 (Naked Single)
  57. Row 3 / Column 7 → 5 (Full House)
  58. Row 5 / Column 9 → 6 (Full House)
  59. Row 1 / Column 1 → 9 (Naked Single)
  60. Row 2 / Column 1 → 3 (Full House)
  61. Row 2 / Column 6 → 6 (Full House)
  62. Row 3 / Column 6 → 4 (Naked Single)
  63. Row 1 / Column 6 → 8 (Full House)
  64. Row 1 / Column 9 → 4 (Full House)
  65. Row 3 / Column 9 → 1 (Full House)
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