1
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6
7
3
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8
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9
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9
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8
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4

This Sudoku Puzzle has 81 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, undefined, Finned Swordfish, Locked Candidates Type 2 (Claiming), Discontinuous Nice Loop, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 9 / Column 6 → 6 (Naked Single)
  2. Row 9 / Column 8 → 8 (Hidden Single)
  3. Row 6 / Column 9 → 8 (Hidden Single)
  4. Row 7 / Column 2 → 6 (Hidden Single)
  5. Row 5 / Column 4 → 8 (Hidden Single)
  6. Row 2 / Column 5 → 8 (Hidden Single)
  7. Row 3 / Column 3 → 8 (Hidden Single)
  8. Row 7 / Column 1 → 8 (Hidden Single)
  9. Row 7 / Column 3 → 4 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 6 in b2 => r46c4<>6
  11. Locked Candidates Type 1 (Pointing): 9 in b4 => r12c1<>9
  12. Naked Triple: 2,3,7 in r46c3,r5c2 => r46c1<>3, r6c1<>7
  13. Naked Triple: 2,3,9 in r7c56,r8c5 => r7c4<>2, r79c4<>3, r7c4<>9
  14. Locked Candidates Type 1 (Pointing): 3 in b8 => r46c5<>3
  15. Finned X-Wing: 3 r59 c27 fr5c8 => r46c7<>3
  16. Finned X-Wing: 7 c19 r28 fr3c9 => r2c78<>7
  17. Finned Swordfish: 3 r159 c278 fr1c1 => r3c2<>3
  18. Locked Candidates Type 1 (Pointing): 3 in b1 => r1c8<>3
  19. W-Wing: 7/3 in r5c2,r8c1 connected by 3 in r1c12 => r9c2<>7
  20. Locked Candidates Type 1 (Pointing): 7 in b7 => r8c79<>7
  21. Locked Candidates Type 2 (Claiming): 7 in c9 => r3c78<>7
  22. Finned Swordfish: 9 c268 r137 fr2c8 => r3c7<>9
  23. Discontinuous Nice Loop: 3 r3c7 -3- r9c7 =3= r9c2 -3- r1c2 =3= r1c1 =4= r1c6 -4- r3c6 =4= r3c7 => r3c7<>3
  24. Discontinuous Nice Loop: 3 r5c8 -3- r5c2 -7- r3c2 =7= r3c9 =3= r3c8 -3- r5c8 => r5c8<>3
  25. X-Wing: 3 r59 c27 => r1c2,r78c7<>3
  26. Row 1 / Column 1 → 3 (Hidden Single)
  27. Row 8 / Column 1 → 7 (Naked Single)
  28. Row 2 / Column 1 → 4 (Naked Single)
  29. Row 1 / Column 6 → 4 (Hidden Single)
  30. Row 3 / Column 7 → 4 (Hidden Single)
  31. XY-Chain: 2 2- r4c3 -3- r5c2 -7- r5c8 -1- r5c6 -2 => r4c45<>2
  32. XY-Chain: 2 2- r5c6 -1- r5c8 -7- r5c2 -3- r9c2 -5- r8c3 -3- r8c5 -9- r7c6 -2 => r3c6<>2
  33. Row 3 / Column 4 → 2 (Hidden Single)
  34. Finned X-Wing: 1 r35 c68 fr5c7 => r6c8<>1
  35. XY-Chain: 9 9- r3c2 -7- r2c3 -5- r8c3 -3- r8c5 -9- r7c6 -2- r5c6 -1- r3c6 -9 => r3c8<>9
  36. XY-Chain: 1 1- r3c8 -3- r3c9 -7- r3c2 -9- r1c2 -5- r9c2 -3- r5c2 -7- r5c8 -1 => r2c8<>1
  37. X-Wing: 1 c68 r35 => r5c7<>1
  38. XY-Chain: 7 7- r5c2 -3- r9c2 -5- r1c2 -9- r3c2 -7- r3c9 -3- r3c8 -1- r5c8 -7 => r5c7<>7
  39. XY-Chain: 3 3- r3c9 -7- r3c2 -9- r3c6 -1- r5c6 -2- r5c7 -3 => r4c9<>3
  40. XY-Chain: 9 9- r7c6 -2- r5c6 -1- r5c8 -7- r5c2 -3- r9c2 -5- r8c3 -3- r8c5 -9 => r7c5<>9
  41. XY-Chain: 3 3- r3c8 -1- r3c6 -9- r7c6 -2- r7c5 -3 => r7c8<>3
  42. Row 7 / Column 5 → 3 (Hidden Single)
  43. Row 8 / Column 5 → 9 (Naked Single)
  44. Row 4 / Column 5 → 6 (Naked Single)
  45. Row 6 / Column 5 → 2 (Full House)
  46. Row 7 / Column 6 → 2 (Naked Single)
  47. Row 4 / Column 9 → 5 (Naked Single)
  48. Row 5 / Column 6 → 1 (Naked Single)
  49. Row 3 / Column 6 → 9 (Full House)
  50. Row 5 / Column 8 → 7 (Naked Single)
  51. Row 1 / Column 4 → 6 (Naked Single)
  52. Row 2 / Column 4 → 1 (Full House)
  53. Row 3 / Column 2 → 7 (Naked Single)
  54. Row 5 / Column 2 → 3 (Naked Single)
  55. Row 5 / Column 7 → 2 (Full House)
  56. Row 2 / Column 3 → 5 (Naked Single)
  57. Row 1 / Column 2 → 9 (Full House)
  58. Row 9 / Column 2 → 5 (Full House)
  59. Row 8 / Column 3 → 3 (Full House)
  60. Row 1 / Column 8 → 5 (Full House)
  61. Row 3 / Column 9 → 3 (Naked Single)
  62. Row 3 / Column 8 → 1 (Full House)
  63. Row 4 / Column 3 → 2 (Naked Single)
  64. Row 6 / Column 3 → 7 (Full House)
  65. Row 4 / Column 7 → 1 (Naked Single)
  66. Row 9 / Column 4 → 7 (Naked Single)
  67. Row 7 / Column 4 → 5 (Full House)
  68. Row 9 / Column 7 → 3 (Full House)
  69. Row 8 / Column 9 → 6 (Naked Single)
  70. Row 2 / Column 9 → 7 (Full House)
  71. Row 8 / Column 7 → 5 (Full House)
  72. Row 7 / Column 8 → 9 (Naked Single)
  73. Row 7 / Column 7 → 7 (Full House)
  74. Row 4 / Column 1 → 9 (Naked Single)
  75. Row 4 / Column 4 → 3 (Full House)
  76. Row 6 / Column 1 → 1 (Full House)
  77. Row 6 / Column 4 → 9 (Full House)
  78. Row 6 / Column 7 → 6 (Naked Single)
  79. Row 2 / Column 7 → 9 (Full House)
  80. Row 2 / Column 8 → 6 (Full House)
  81. Row 6 / Column 8 → 3 (Full House)
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