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

This Sudoku Puzzle has 65 steps and it is solved using Naked Single, Hidden Single, Locked Pair, Locked Candidates Type 1 (Pointing), Naked Pair, Hidden Pair, undefined, Swordfish, Naked Triple, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 1 → 2 (Naked Single)
  2. Row 3 / Column 4 → 8 (Hidden Single)
  3. Row 9 / Column 6 → 2 (Hidden Single)
  4. Row 7 / Column 6 → 9 (Hidden Single)
  5. Row 2 / Column 5 → 2 (Hidden Single)
  6. Row 1 / Column 7 → 2 (Hidden Single)
  7. Locked Pair: 4,7 in r5c46 => r46c5,r5c237<>7, r46c5<>4
  8. Row 5 / Column 2 → 2 (Naked Single)
  9. Row 5 / Column 8 → 9 (Naked Single)
  10. Row 8 / Column 5 → 4 (Hidden Single)
  11. Row 6 / Column 8 → 2 (Hidden Single)
  12. Row 4 / Column 3 → 9 (Hidden Single)
  13. Locked Candidates Type 1 (Pointing): 5 in b5 => r37c5<>5
  14. Locked Candidates Type 1 (Pointing): 6 in b5 => r37c5<>6
  15. Locked Candidates Type 1 (Pointing): 1 in b8 => r2c4<>1
  16. Naked Pair: 5,7 in r7c2,r9c3 => r8c3<>5
  17. Naked Pair: 3,8 in r58c3 => r6c3<>3
  18. Hidden Pair: 1,6 in r7c48 => r7c4<>3, r7c48<>5, r7c4<>7
  19. X-Wing: 8 r58 c37 => r4c7<>8
  20. Hidden Pair: 4,8 in r4c19 => r4c9<>5
  21. Swordfish: 3 r258 c347 => r6c7<>3
  22. Naked Triple: 1,5,7 in r4c78,r6c7 => r6c9<>5
  23. Naked Triple: 1,5,7 in r469c7 => r28c7<>5
  24. Locked Candidates Type 1 (Pointing): 5 in b3 => r3c26<>5
  25. Row 7 / Column 2 → 5 (Hidden Single)
  26. Row 7 / Column 9 → 8 (Naked Single)
  27. Row 9 / Column 3 → 7 (Naked Single)
  28. Row 4 / Column 9 → 4 (Naked Single)
  29. Row 7 / Column 1 → 3 (Naked Single)
  30. Row 8 / Column 3 → 8 (Full House)
  31. Row 8 / Column 7 → 6 (Naked Single)
  32. Row 4 / Column 1 → 8 (Naked Single)
  33. Row 6 / Column 1 → 4 (Full House)
  34. Row 6 / Column 9 → 3 (Naked Single)
  35. Row 3 / Column 9 → 5 (Full House)
  36. Row 7 / Column 5 → 7 (Naked Single)
  37. Row 5 / Column 3 → 3 (Naked Single)
  38. Row 2 / Column 7 → 3 (Naked Single)
  39. Row 3 / Column 8 → 6 (Full House)
  40. Row 7 / Column 8 → 1 (Naked Single)
  41. Row 4 / Column 8 → 5 (Full House)
  42. Row 7 / Column 4 → 6 (Full House)
  43. Row 9 / Column 7 → 5 (Full House)
  44. Row 9 / Column 4 → 1 (Full House)
  45. Row 8 / Column 6 → 5 (Naked Single)
  46. Row 8 / Column 4 → 3 (Full House)
  47. Row 5 / Column 7 → 8 (Naked Single)
  48. Row 3 / Column 5 → 3 (Naked Single)
  49. Row 3 / Column 2 → 1 (Naked Single)
  50. Row 3 / Column 6 → 7 (Full House)
  51. Row 4 / Column 5 → 6 (Naked Single)
  52. Row 6 / Column 5 → 5 (Full House)
  53. Row 2 / Column 4 → 5 (Naked Single)
  54. Row 5 / Column 6 → 4 (Naked Single)
  55. Row 5 / Column 4 → 7 (Full House)
  56. Row 1 / Column 4 → 4 (Full House)
  57. Row 4 / Column 2 → 7 (Naked Single)
  58. Row 4 / Column 7 → 1 (Full House)
  59. Row 6 / Column 2 → 6 (Full House)
  60. Row 6 / Column 7 → 7 (Full House)
  61. Row 6 / Column 3 → 1 (Full House)
  62. Row 2 / Column 3 → 6 (Naked Single)
  63. Row 1 / Column 3 → 5 (Full House)
  64. Row 1 / Column 6 → 6 (Full House)
  65. Row 2 / Column 6 → 1 (Full House)
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