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

This Sudoku Puzzle has 73 steps and it is solved using Hidden Single, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Turbot Fish, undefined, Full House, Uniqueness Test 1 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 3 / Column 5 → 5 (Hidden Single)
  2. Row 8 / Column 2 → 5 (Hidden Single)
  3. Row 7 / Column 9 → 5 (Hidden Single)
  4. Row 3 / Column 1 → 8 (Hidden Single)
  5. Row 1 / Column 5 → 8 (Hidden Single)
  6. Row 4 / Column 4 → 5 (Hidden Single)
  7. Row 5 / Column 3 → 5 (Hidden Single)
  8. Row 8 / Column 1 → 1 (Hidden Single)
  9. Row 7 / Column 7 → 1 (Hidden Single)
  10. Row 9 / Column 2 → 8 (Hidden Single)
  11. Row 9 / Column 9 → 6 (Naked Single)
  12. Row 5 / Column 9 → 4 (Naked Single)
  13. Row 8 / Column 8 → 8 (Hidden Single)
  14. Row 5 / Column 4 → 9 (Hidden Single)
  15. Row 4 / Column 9 → 8 (Hidden Single)
  16. Row 7 / Column 3 → 6 (Hidden Single)
  17. Row 4 / Column 7 → 9 (Hidden Single)
  18. Row 5 / Column 5 → 3 (Hidden Single)
  19. Row 8 / Column 5 → 2 (Naked Single)
  20. Locked Candidates Type 1 (Pointing): 1 in b4 => r12c2<>1
  21. Locked Candidates Type 1 (Pointing): 7 in b6 => r2c8<>7
  22. Locked Candidates Type 2 (Claiming): 3 in r8 => r7c6<>3
  23. Naked Pair: 1,7 in r3c39 => r3c6<>1, r3c6<>7
  24. Locked Candidates Type 1 (Pointing): 1 in b2 => r2c3<>1
  25. Turbot Fish: 2 r5c1 =2= r5c7 -2- r9c7 =2= r7c8 => r7c1<>2
  26. W-Wing: 3/6 in r2c8,r8c4 connected by 6 in r1c47 => r2c4<>3
  27. W-Wing: 6/3 in r2c8,r8c6 connected by 3 in r3c67 => r2c6<>6
  28. Row 8 / Column 6 → 6 (Hidden Single)
  29. Row 8 / Column 4 → 3 (Full House)
  30. Uniqueness Test 1: 1/7 in r1c39,r3c39 => r1c3<>1, r1c3<>7
  31. Row 1 / Column 3 → 2 (Naked Single)
  32. Row 1 / Column 9 → 1 (Hidden Single)
  33. Row 3 / Column 9 → 7 (Full House)
  34. Row 3 / Column 3 → 1 (Naked Single)
  35. Naked Pair: 7,9 in r9c35 => r9c1<>7
  36. X-Wing: 2 r59 c17 => r4c1<>2
  37. XY-Chain: 4 4- r6c4 -7- r6c8 -2- r7c8 -3- r7c1 -7- r7c6 -4 => r46c6<>4
  38. 2-String Kite: 4 in r1c1,r6c4 (connected by r4c1,r6c2) => r1c4<>4
  39. XY-Chain: 3 3- r3c6 -4- r7c6 -7- r7c1 -3- r7c8 -2- r9c7 -3 => r3c7<>3
  40. Row 3 / Column 7 → 4 (Naked Single)
  41. Row 3 / Column 6 → 3 (Full House)
  42. Locked Candidates Type 1 (Pointing): 4 in b2 => r2c2<>4
  43. XY-Chain: 7 7- r1c4 -6- r1c7 -3- r9c7 -2- r9c1 -3- r7c1 -7- r9c3 -9- r2c3 -7 => r1c1,r2c456<>7
  44. Row 1 / Column 4 → 7 (Hidden Single)
  45. Row 6 / Column 4 → 4 (Naked Single)
  46. Row 2 / Column 4 → 6 (Full House)
  47. Row 2 / Column 8 → 3 (Naked Single)
  48. Row 1 / Column 7 → 6 (Full House)
  49. Row 2 / Column 2 → 9 (Naked Single)
  50. Row 7 / Column 8 → 2 (Naked Single)
  51. Row 9 / Column 7 → 3 (Full House)
  52. Row 5 / Column 7 → 2 (Full House)
  53. Row 5 / Column 1 → 6 (Full House)
  54. Row 2 / Column 3 → 7 (Naked Single)
  55. Row 9 / Column 3 → 9 (Full House)
  56. Row 6 / Column 8 → 7 (Naked Single)
  57. Row 4 / Column 8 → 6 (Full House)
  58. Row 7 / Column 2 → 3 (Naked Single)
  59. Row 9 / Column 1 → 2 (Naked Single)
  60. Row 9 / Column 5 → 7 (Full House)
  61. Row 7 / Column 1 → 7 (Full House)
  62. Row 4 / Column 1 → 4 (Naked Single)
  63. Row 1 / Column 1 → 3 (Full House)
  64. Row 1 / Column 2 → 4 (Full House)
  65. Row 4 / Column 5 → 1 (Naked Single)
  66. Row 7 / Column 6 → 4 (Naked Single)
  67. Row 7 / Column 5 → 9 (Full House)
  68. Row 2 / Column 5 → 4 (Full House)
  69. Row 2 / Column 6 → 1 (Full House)
  70. Row 4 / Column 2 → 2 (Naked Single)
  71. Row 4 / Column 6 → 7 (Full House)
  72. Row 6 / Column 6 → 2 (Full House)
  73. Row 6 / Column 2 → 1 (Full House)
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