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

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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