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

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 2 (Claiming), Swordfish, AIC, Discontinuous Nice Loop, Naked Pair, Turbot Fish, Sue de Coq, Locked Candidates Type 1 (Pointing), undefined techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 9 → 1 (Hidden Single)
  2. Row 6 / Column 2 → 1 (Hidden Single)
  3. Row 8 / Column 6 → 1 (Hidden Single)
  4. Row 5 / Column 4 → 1 (Hidden Single)
  5. Row 1 / Column 9 → 8 (Hidden Single)
  6. Row 4 / Column 2 → 6 (Hidden Single)
  7. Row 8 / Column 7 → 6 (Hidden Single)
  8. Row 3 / Column 4 → 7 (Hidden Single)
  9. Row 3 / Column 2 → 8 (Hidden Single)
  10. Row 6 / Column 8 → 6 (Hidden Single)
  11. Row 3 / Column 5 → 2 (Hidden Single)
  12. Row 1 / Column 4 → 4 (Naked Single)
  13. Row 9 / Column 4 → 8 (Naked Single)
  14. Row 2 / Column 4 → 6 (Naked Single)
  15. Row 7 / Column 4 → 2 (Full House)
  16. Row 2 / Column 1 → 4 (Hidden Single)
  17. Row 7 / Column 6 → 6 (Hidden Single)
  18. Locked Candidates Type 2 (Claiming): 3 in c1 => r46c3,r5c2<>3
  19. Swordfish: 9 r159 c268 => r2c6,r8c2<>9
  20. AIC: 8 8- r2c6 =8= r2c5 =9= r2c7 -9- r6c7 =9= r6c3 =8= r6c5 -8 => r2c5,r4c6<>8
  21. Row 2 / Column 6 → 8 (Hidden Single)
  22. Discontinuous Nice Loop: 7 r5c8 -7- r5c6 =7= r4c6 =4= r9c6 =9= r9c2 -9- r5c2 =9= r5c8 => r5c8<>7
  23. Row 7 / Column 8 → 7 (Hidden Single)
  24. Naked Pair: 3,5 in r27c3 => r1c3<>3, r148c3<>5
  25. Row 1 / Column 3 → 2 (Naked Single)
  26. Turbot Fish: 4 r4c6 =4= r9c6 -4- r9c8 =4= r8c9 => r4c9<>4
  27. Discontinuous Nice Loop: 7 r5c9 -7- r5c6 =7= r4c6 =4= r9c6 -4- r9c8 =4= r8c9 -4- r6c9 -7- r5c9 => r5c9<>7
  28. Sue de Coq: r4c79 - {23457} (r4c356 - {3478}, r5c9 - {25}) => r5c8<>5, r4c1<>3, r4c1<>7
  29. Discontinuous Nice Loop: 3 r6c5 -3- r6c1 -7- r4c3 -8- r4c5 =8= r6c5 => r6c5<>3
  30. AIC: 8 8- r4c3 -7- r8c3 -9- r8c5 =9= r2c5 =3= r4c5 =8= r6c5 -8 => r4c5,r6c3<>8
  31. Row 4 / Column 3 → 8 (Hidden Single)
  32. Row 6 / Column 5 → 8 (Hidden Single)
  33. Locked Candidates Type 1 (Pointing): 4 in b5 => r4c7<>4
  34. W-Wing: 5/3 in r2c3,r4c7 connected by 3 in r24c5 => r2c7<>5
  35. W-Wing: 3/5 in r1c2,r3c6 connected by 5 in r2c35 => r1c6<>3
  36. W-Wing: 5/3 in r3c6,r4c7 connected by 3 in r24c5 => r3c7<>5
  37. Row 4 / Column 7 → 5 (Hidden Single)
  38. Row 4 / Column 1 → 2 (Naked Single)
  39. Row 5 / Column 9 → 2 (Naked Single)
  40. Row 4 / Column 9 → 7 (Naked Single)
  41. Row 6 / Column 9 → 4 (Naked Single)
  42. Row 8 / Column 9 → 5 (Full House)
  43. Row 9 / Column 8 → 4 (Full House)
  44. Row 8 / Column 1 → 7 (Naked Single)
  45. Row 6 / Column 1 → 3 (Naked Single)
  46. Row 5 / Column 1 → 5 (Full House)
  47. Row 8 / Column 3 → 9 (Naked Single)
  48. Row 6 / Column 7 → 9 (Naked Single)
  49. Row 6 / Column 3 → 7 (Full House)
  50. Row 5 / Column 2 → 9 (Full House)
  51. Row 5 / Column 8 → 3 (Full House)
  52. Row 5 / Column 6 → 7 (Full House)
  53. Row 8 / Column 5 → 4 (Naked Single)
  54. Row 8 / Column 2 → 2 (Full House)
  55. Row 9 / Column 2 → 5 (Naked Single)
  56. Row 9 / Column 6 → 9 (Full House)
  57. Row 7 / Column 5 → 5 (Full House)
  58. Row 2 / Column 7 → 3 (Naked Single)
  59. Row 3 / Column 7 → 4 (Full House)
  60. Row 3 / Column 8 → 5 (Naked Single)
  61. Row 1 / Column 8 → 9 (Full House)
  62. Row 3 / Column 6 → 3 (Full House)
  63. Row 4 / Column 5 → 3 (Naked Single)
  64. Row 2 / Column 5 → 9 (Full House)
  65. Row 1 / Column 6 → 5 (Full House)
  66. Row 1 / Column 2 → 3 (Full House)
  67. Row 2 / Column 3 → 5 (Full House)
  68. Row 7 / Column 3 → 3 (Full House)
  69. Row 4 / Column 6 → 4 (Full House)
  70. Row 7 / Column 2 → 4 (Full House)
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