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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Locked Pair, Naked Single, Full House, Uniqueness Test 3, Discontinuous Nice Loop, Sue de Coq, Turbot Fish, undefined techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 8 → 4 (Hidden Single)
  2. Row 9 / Column 5 → 5 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 6 in b8 => r7c7<>6
  4. Locked Candidates Type 1 (Pointing): 7 in b8 => r8c78<>7
  5. Locked Candidates Type 2 (Claiming): 6 in c6 => r4c45,r6c4<>6
  6. Locked Pair: 2,7 in r4c45 => r4c236,r5c56<>2, r4c38,r5c5,r6c4<>7
  7. Row 4 / Column 3 → 3 (Naked Single)
  8. Row 9 / Column 3 → 2 (Naked Single)
  9. Row 5 / Column 1 → 2 (Hidden Single)
  10. Row 1 / Column 1 → 5 (Hidden Single)
  11. Row 4 / Column 2 → 9 (Hidden Single)
  12. Row 4 / Column 8 → 6 (Naked Single)
  13. Row 4 / Column 6 → 5 (Naked Single)
  14. Row 5 / Column 9 → 5 (Hidden Single)
  15. Row 2 / Column 7 → 5 (Hidden Single)
  16. Row 6 / Column 2 → 5 (Hidden Single)
  17. Row 6 / Column 6 → 6 (Hidden Single)
  18. Row 9 / Column 7 → 6 (Hidden Single)
  19. Locked Candidates Type 1 (Pointing): 4 in b4 => r137c3<>4
  20. Row 7 / Column 3 → 1 (Naked Single)
  21. Row 8 / Column 2 → 3 (Naked Single)
  22. Row 9 / Column 1 → 9 (Naked Single)
  23. Row 7 / Column 1 → 4 (Full House)
  24. Row 3 / Column 1 → 3 (Full House)
  25. Row 8 / Column 7 → 1 (Hidden Single)
  26. Row 2 / Column 5 → 3 (Hidden Single)
  27. Row 7 / Column 7 → 2 (Hidden Single)
  28. Locked Pair: 7,8 in r3c79 => r1c79,r3c35<>8
  29. Row 3 / Column 3 → 6 (Naked Single)
  30. Row 1 / Column 3 → 8 (Naked Single)
  31. Uniqueness Test 3: 2/7 in r4c45,r8c45 => r8c6<>8
  32. Row 8 / Column 6 → 2 (Naked Single)
  33. Discontinuous Nice Loop: 7 r5c7 -7- r3c7 -8- r3c9 =8= r7c9 =9= r1c9 -9- r1c7 =9= r5c7 => r5c7<>7
  34. Sue de Coq: r56c8 - {3789} (r9c8 - {37}, r5c7 - {89}) => r6c7<>8
  35. Turbot Fish: 8 r6c4 =8= r6c8 -8- r8c8 =8= r7c9 => r7c4<>8
  36. XY-Chain: 8 8- r5c7 -9- r1c7 -3- r6c7 -7- r6c3 -4- r6c4 -8 => r5c56,r6c8<>8
  37. Row 5 / Column 6 → 1 (Naked Single)
  38. Row 2 / Column 6 → 8 (Full House)
  39. Row 5 / Column 5 → 4 (Naked Single)
  40. Row 2 / Column 4 → 2 (Naked Single)
  41. Row 2 / Column 2 → 1 (Full House)
  42. Row 3 / Column 5 → 1 (Naked Single)
  43. Row 5 / Column 3 → 7 (Naked Single)
  44. Row 6 / Column 3 → 4 (Full House)
  45. Row 6 / Column 4 → 8 (Naked Single)
  46. Row 1 / Column 5 → 6 (Naked Single)
  47. Row 1 / Column 4 → 4 (Full House)
  48. Row 4 / Column 4 → 7 (Naked Single)
  49. Row 4 / Column 5 → 2 (Full House)
  50. Row 3 / Column 2 → 4 (Naked Single)
  51. Row 1 / Column 2 → 2 (Full House)
  52. Row 7 / Column 5 → 8 (Naked Single)
  53. Row 8 / Column 5 → 7 (Full House)
  54. Row 8 / Column 4 → 9 (Naked Single)
  55. Row 7 / Column 4 → 6 (Full House)
  56. Row 7 / Column 9 → 9 (Full House)
  57. Row 8 / Column 8 → 8 (Full House)
  58. Row 1 / Column 9 → 3 (Naked Single)
  59. Row 1 / Column 7 → 9 (Full House)
  60. Row 5 / Column 8 → 9 (Naked Single)
  61. Row 5 / Column 7 → 8 (Full House)
  62. Row 9 / Column 9 → 7 (Naked Single)
  63. Row 3 / Column 9 → 8 (Full House)
  64. Row 3 / Column 7 → 7 (Full House)
  65. Row 9 / Column 8 → 3 (Full House)
  66. Row 6 / Column 7 → 3 (Full House)
  67. Row 6 / Column 8 → 7 (Full House)
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