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

This Sudoku Puzzle has 71 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Naked Pair, undefined, Uniqueness Test 1, Empty Rectangle, Naked Triple, Full House techniques.

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

Solution Steps:

  1. Row 8 / Column 2 → 5 (Naked Single)
  2. Row 4 / Column 3 → 8 (Hidden Single)
  3. Row 9 / Column 3 → 3 (Hidden Single)
  4. Row 8 / Column 8 → 3 (Hidden Single)
  5. Row 1 / Column 8 → 4 (Naked Single)
  6. Row 7 / Column 5 → 5 (Hidden Single)
  7. Row 9 / Column 1 → 2 (Hidden Single)
  8. Row 7 / Column 8 → 8 (Hidden Single)
  9. Row 9 / Column 7 → 9 (Hidden Single)
  10. Row 8 / Column 1 → 8 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 4 in b7 => r7c79<>4
  12. Row 6 / Column 7 → 4 (Hidden Single)
  13. Row 9 / Column 9 → 4 (Hidden Single)
  14. Row 9 / Column 6 → 7 (Naked Single)
  15. Row 6 / Column 4 → 3 (Hidden Single)
  16. Row 6 / Column 1 → 5 (Hidden Single)
  17. Naked Pair: 1,6 in r2c8,r3c7 => r3c9<>1, r3c9<>6
  18. Row 3 / Column 9 → 7 (Naked Single)
  19. Naked Pair: 1,6 in r37c7 => r5c7<>1, r5c7<>6
  20. X-Wing: 2 r15 c35 => r6c35<>2
  21. Uniqueness Test 1: 3/5 in r1c79,r5c79 => r5c9<>3, r5c9<>5
  22. Row 5 / Column 7 → 3 (Hidden Single)
  23. Row 1 / Column 7 → 5 (Naked Single)
  24. Row 1 / Column 9 → 3 (Naked Single)
  25. Row 5 / Column 4 → 5 (Hidden Single)
  26. Row 4 / Column 9 → 5 (Hidden Single)
  27. Empty Rectangle: 6 in b6 (r2c18) => r5c1<>6
  28. Locked Candidates Type 1 (Pointing): 6 in b4 => r3c3<>6
  29. Naked Triple: 4,8,9 in r3c345 => r3c1<>4, r3c1<>9
  30. XY-Wing: 7/9/4 in r17c1,r3c3 => r2c1,r7c3<>4
  31. Row 7 / Column 3 → 7 (Naked Single)
  32. Row 7 / Column 1 → 4 (Full House)
  33. Row 3 / Column 3 → 4 (Hidden Single)
  34. Row 4 / Column 5 → 4 (Hidden Single)
  35. Locked Candidates Type 1 (Pointing): 9 in b1 => r1c5<>9
  36. Locked Candidates Type 1 (Pointing): 7 in b4 => r2c2<>7
  37. W-Wing: 6/9 in r4c6,r6c3 connected by 9 in r46c8 => r6c6<>6
  38. Row 4 / Column 6 → 6 (Hidden Single)
  39. W-Wing: 9/2 in r1c3,r6c6 connected by 2 in r2c26 => r6c3<>9
  40. Row 6 / Column 3 → 6 (Naked Single)
  41. Row 5 / Column 9 → 6 (Hidden Single)
  42. Row 7 / Column 9 → 1 (Full House)
  43. Row 7 / Column 7 → 6 (Full House)
  44. Row 3 / Column 7 → 1 (Full House)
  45. Row 2 / Column 8 → 6 (Full House)
  46. Row 3 / Column 1 → 6 (Naked Single)
  47. Locked Candidates Type 1 (Pointing): 9 in b4 => r5c5<>9
  48. W-Wing: 1/7 in r2c1,r4c2 connected by 7 in r24c4 => r2c2,r5c1<>1
  49. Row 2 / Column 2 → 2 (Naked Single)
  50. Row 5 / Column 1 → 9 (Naked Single)
  51. Row 1 / Column 3 → 9 (Naked Single)
  52. Row 5 / Column 3 → 2 (Full House)
  53. Row 5 / Column 5 → 1 (Full House)
  54. Row 2 / Column 6 → 4 (Naked Single)
  55. Row 1 / Column 1 → 7 (Naked Single)
  56. Row 1 / Column 5 → 2 (Full House)
  57. Row 2 / Column 1 → 1 (Full House)
  58. Row 2 / Column 4 → 7 (Full House)
  59. Row 9 / Column 5 → 8 (Naked Single)
  60. Row 9 / Column 4 → 1 (Full House)
  61. Row 8 / Column 6 → 9 (Naked Single)
  62. Row 6 / Column 6 → 2 (Full House)
  63. Row 8 / Column 4 → 4 (Full House)
  64. Row 4 / Column 4 → 9 (Naked Single)
  65. Row 3 / Column 4 → 8 (Full House)
  66. Row 3 / Column 5 → 9 (Full House)
  67. Row 6 / Column 5 → 7 (Full House)
  68. Row 4 / Column 8 → 1 (Naked Single)
  69. Row 4 / Column 2 → 7 (Full House)
  70. Row 6 / Column 2 → 1 (Full House)
  71. Row 6 / Column 8 → 9 (Full House)
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