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

This Sudoku Puzzle has 76 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Locked Candidates Type 2 (Claiming), Full House, Naked Triple, undefined, Sue de Coq 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 2 / Column 4 → 5 (Hidden Single)
  2. Row 3 / Column 2 → 5 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 8 in b4 => r6c79<>8
  4. Row 6 / Column 9 → 7 (Naked Single)
  5. Locked Candidates Type 2 (Claiming): 6 in r9 => r7c46,r8c5<>6
  6. Locked Candidates Type 2 (Claiming): 3 in c2 => r78c1,r8c3<>3
  7. Locked Candidates Type 2 (Claiming): 3 in r8 => r7c78,r9c8<>3
  8. Locked Candidates Type 2 (Claiming): 6 in c5 => r1c46,r3c46<>6
  9. Locked Candidates Type 2 (Claiming): 8 in c9 => r7c78,r8c78,r9c8<>8
  10. Row 9 / Column 8 → 1 (Naked Single)
  11. Row 7 / Column 8 → 7 (Naked Single)
  12. Row 9 / Column 2 → 3 (Naked Single)
  13. Row 7 / Column 7 → 6 (Naked Single)
  14. Row 9 / Column 4 → 6 (Naked Single)
  15. Row 9 / Column 6 → 8 (Full House)
  16. Row 7 / Column 9 → 8 (Naked Single)
  17. Row 8 / Column 5 → 1 (Naked Single)
  18. Row 7 / Column 6 → 4 (Naked Single)
  19. Row 7 / Column 4 → 3 (Full House)
  20. Row 2 / Column 9 → 6 (Hidden Single)
  21. Row 5 / Column 6 → 6 (Hidden Single)
  22. Locked Candidates Type 1 (Pointing): 1 in b2 => r1c123<>1
  23. Naked Triple: 4,7,9 in r246c5 => r13c5<>4, r13c5<>7, r13c5<>9
  24. Locked Candidates Type 1 (Pointing): 4 in b2 => r6c4<>4
  25. Row 6 / Column 4 → 1 (Naked Single)
  26. Row 1 / Column 6 → 1 (Hidden Single)
  27. Naked Triple: 2,8,9 in r135c8 => r48c8<>2
  28. W-Wing: 2/7 in r2c7,r5c4 connected by 7 in r24c5 => r5c7<>2
  29. 2-String Kite: 2 in r3c6,r5c8 (connected by r4c6,r5c4) => r3c8<>2
  30. XY-Wing: 7/9/2 in r2c57,r3c6 => r3c7<>2
  31. Sue de Coq: r4c13 - {1379} (r4c689 - {2359}, r5c2 - {17}) => r4c5<>9, r4c7<>2, r4c7<>3
  32. XY-Chain: 9 9- r3c6 -2- r4c6 -9- r6c5 -4- r4c5 -7- r5c4 -2- r5c8 -8- r3c8 -9 => r3c13<>9
  33. XY-Chain: 8 8- r3c7 -7- r2c7 -2- r8c7 -3- r6c7 -4- r6c5 -9- r4c6 -2- r3c6 -9- r3c8 -8 => r1c8,r3c5<>8
  34. Row 3 / Column 5 → 6 (Naked Single)
  35. Row 1 / Column 5 → 8 (Naked Single)
  36. XY-Wing: 2/9/7 in r1c28,r2c7 => r2c3<>7
  37. W-Wing: 1/9 in r2c3,r7c1 connected by 9 in r17c2 => r2c1<>1
  38. Row 2 / Column 3 → 1 (Hidden Single)
  39. 2-String Kite: 9 in r2c1,r4c6 (connected by r2c5,r3c6) => r4c1<>9
  40. XY-Wing: 1/4/3 in r4c17,r6c7 => r4c8,r6c13<>3
  41. Row 4 / Column 8 → 5 (Naked Single)
  42. Row 4 / Column 9 → 2 (Naked Single)
  43. Row 8 / Column 9 → 5 (Full House)
  44. Row 8 / Column 8 → 3 (Naked Single)
  45. Row 8 / Column 7 → 2 (Full House)
  46. Row 4 / Column 6 → 9 (Naked Single)
  47. Row 3 / Column 6 → 2 (Full House)
  48. Row 5 / Column 8 → 8 (Naked Single)
  49. Row 2 / Column 7 → 7 (Naked Single)
  50. Row 6 / Column 5 → 4 (Naked Single)
  51. Row 3 / Column 8 → 9 (Naked Single)
  52. Row 1 / Column 8 → 2 (Full House)
  53. Row 3 / Column 7 → 8 (Full House)
  54. Row 5 / Column 7 → 1 (Naked Single)
  55. Row 2 / Column 5 → 9 (Naked Single)
  56. Row 4 / Column 5 → 7 (Full House)
  57. Row 2 / Column 1 → 2 (Full House)
  58. Row 5 / Column 4 → 2 (Full House)
  59. Row 5 / Column 2 → 7 (Full House)
  60. Row 6 / Column 7 → 3 (Naked Single)
  61. Row 4 / Column 7 → 4 (Full House)
  62. Row 4 / Column 3 → 3 (Naked Single)
  63. Row 4 / Column 1 → 1 (Full House)
  64. Row 1 / Column 2 → 9 (Naked Single)
  65. Row 7 / Column 2 → 1 (Full House)
  66. Row 7 / Column 1 → 9 (Full House)
  67. Row 3 / Column 3 → 7 (Naked Single)
  68. Row 6 / Column 1 → 8 (Naked Single)
  69. Row 6 / Column 3 → 9 (Full House)
  70. Row 1 / Column 3 → 6 (Naked Single)
  71. Row 8 / Column 3 → 8 (Full House)
  72. Row 8 / Column 1 → 6 (Full House)
  73. Row 3 / Column 4 → 4 (Naked Single)
  74. Row 1 / Column 4 → 7 (Full House)
  75. Row 1 / Column 1 → 4 (Full House)
  76. Row 3 / Column 1 → 3 (Full House)
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