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

This Sudoku Puzzle has 74 steps and it is solved using Naked Single, Hidden Single, Locked Triple, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Empty Rectangle, Naked Pair, Hidden Rectangle, undefined, Uniqueness Test 1 techniques.

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

Solution Steps:

  1. Row 5 / Column 4 → 8 (Naked Single)
  2. Row 5 / Column 6 → 3 (Hidden Single)
  3. Row 3 / Column 4 → 9 (Hidden Single)
  4. Row 7 / Column 6 → 6 (Hidden Single)
  5. Row 2 / Column 5 → 4 (Hidden Single)
  6. Locked Triple: 1,5,7 in r1c456 => r1c28<>5, r1c2,r2c6<>7
  7. Row 2 / Column 3 → 7 (Hidden Single)
  8. Row 5 / Column 3 → 6 (Naked Single)
  9. Row 1 / Column 6 → 7 (Hidden Single)
  10. Row 2 / Column 6 → 2 (Hidden Single)
  11. Row 3 / Column 6 → 8 (Naked Single)
  12. Row 9 / Column 6 → 1 (Full House)
  13. Row 3 / Column 2 → 2 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 5 in b1 => r4c1<>5
  15. Locked Candidates Type 1 (Pointing): 9 in b7 => r7c78<>9
  16. Locked Candidates Type 2 (Claiming): 2 in r9 => r7c4,r8c5<>2
  17. Locked Candidates Type 2 (Claiming): 4 in c7 => r7c89,r8c89,r9c8<>4
  18. Hidden Pair: 5,7 in r45c2 => r4c2<>1, r4c2<>3, r4c2<>8
  19. Locked Candidates Type 1 (Pointing): 1 in b4 => r78c1<>1
  20. Locked Candidates Type 1 (Pointing): 8 in b4 => r78c3<>8
  21. Hidden Pair: 1,2 in r78c9 => r78c9<>5, r7c9<>7, r78c9<>8, r8c9<>3
  22. Row 7 / Column 8 → 7 (Hidden Single)
  23. Empty Rectangle: 3 in b7 (r1c28) => r8c8<>3
  24. Naked Pair: 5,8 in r8c58 => r8c27<>8, r8c7<>5
  25. Hidden Rectangle: 4/5 in r3c89,r5c89 => r3c9<>5
  26. XY-Chain: 4 4- r3c9 -3- r1c8 -6- r1c2 -3- r9c2 -8- r9c5 -2- r9c4 -4- r7c4 -5- r8c5 -8- r8c8 -5- r5c8 -4 => r3c8,r5c9<>4
  27. Row 3 / Column 9 → 4 (Hidden Single)
  28. Row 5 / Column 8 → 4 (Hidden Single)
  29. Locked Candidates Type 1 (Pointing): 3 in b3 => r69c8<>3
  30. Locked Candidates Type 1 (Pointing): 3 in b9 => r46c7<>3
  31. Uniqueness Test 1: 5/7 in r4c29,r5c29 => r4c9<>5, r4c9<>7
  32. XY-Chain: 4 4- r7c1 -9- r7c3 -2- r8c3 -3- r8c7 -4 => r7c7,r8c1<>4
  33. Row 8 / Column 7 → 4 (Hidden Single)
  34. Row 7 / Column 1 → 4 (Hidden Single)
  35. Row 7 / Column 4 → 5 (Naked Single)
  36. Row 1 / Column 4 → 1 (Naked Single)
  37. Row 1 / Column 5 → 5 (Full House)
  38. Row 7 / Column 7 → 8 (Naked Single)
  39. Row 8 / Column 5 → 8 (Naked Single)
  40. Row 6 / Column 4 → 2 (Naked Single)
  41. Row 9 / Column 4 → 4 (Full House)
  42. Row 9 / Column 5 → 2 (Full House)
  43. Row 7 / Column 2 → 1 (Naked Single)
  44. Row 8 / Column 8 → 5 (Naked Single)
  45. Row 9 / Column 8 → 9 (Naked Single)
  46. Row 7 / Column 9 → 2 (Naked Single)
  47. Row 7 / Column 3 → 9 (Full House)
  48. Row 3 / Column 8 → 3 (Naked Single)
  49. Row 3 / Column 1 → 5 (Full House)
  50. Row 9 / Column 7 → 3 (Naked Single)
  51. Row 8 / Column 9 → 1 (Full House)
  52. Row 9 / Column 2 → 8 (Full House)
  53. Row 1 / Column 8 → 6 (Naked Single)
  54. Row 1 / Column 2 → 3 (Full House)
  55. Row 2 / Column 1 → 6 (Full House)
  56. Row 6 / Column 8 → 8 (Full House)
  57. Row 2 / Column 7 → 5 (Naked Single)
  58. Row 2 / Column 9 → 8 (Full House)
  59. Row 8 / Column 2 → 6 (Naked Single)
  60. Row 8 / Column 1 → 3 (Naked Single)
  61. Row 8 / Column 3 → 2 (Full House)
  62. Row 4 / Column 9 → 3 (Naked Single)
  63. Row 6 / Column 3 → 3 (Naked Single)
  64. Row 4 / Column 3 → 8 (Full House)
  65. Row 4 / Column 7 → 9 (Naked Single)
  66. Row 6 / Column 7 → 6 (Full House)
  67. Row 6 / Column 9 → 7 (Naked Single)
  68. Row 5 / Column 9 → 5 (Full House)
  69. Row 5 / Column 2 → 7 (Full House)
  70. Row 4 / Column 2 → 5 (Full House)
  71. Row 4 / Column 1 → 1 (Naked Single)
  72. Row 4 / Column 5 → 7 (Full House)
  73. Row 6 / Column 5 → 1 (Full House)
  74. Row 6 / Column 1 → 9 (Full House)
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