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

This Sudoku Puzzle has 69 steps and it is solved using Naked Single, Hidden Single, Naked Triple, undefined, Sue de Coq, Locked Candidates Type 1 (Pointing), Discontinuous Nice Loop, Locked Candidates Type 2 (Claiming), Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 9 → 9 (Naked Single)
  2. Row 6 / Column 8 → 2 (Hidden Single)
  3. Row 6 / Column 1 → 9 (Hidden Single)
  4. Row 6 / Column 5 → 3 (Naked Single)
  5. Row 6 / Column 4 → 7 (Naked Single)
  6. Row 6 / Column 3 → 5 (Naked Single)
  7. Row 6 / Column 6 → 8 (Naked Single)
  8. Row 4 / Column 2 → 6 (Hidden Single)
  9. Row 4 / Column 9 → 8 (Naked Single)
  10. Row 4 / Column 7 → 1 (Naked Single)
  11. Row 5 / Column 7 → 5 (Naked Single)
  12. Row 4 / Column 3 → 3 (Hidden Single)
  13. Row 5 / Column 6 → 1 (Hidden Single)
  14. Naked Triple: 3,6,7 in r7c79,r8c9 => r79c8,r8c7<>6, r8c7<>3, r8c7<>7
  15. Row 7 / Column 8 → 5 (Naked Single)
  16. Row 2 / Column 8 → 6 (Hidden Single)
  17. Finned X-Wing: 2 c25 r38 fr1c5 => r3c6<>2
  18. Finned X-Wing: 9 c58 r39 fr8c5 => r9c46<>9
  19. Sue de Coq: r123c1 - {12378} (r5c1 - {27}, r2c23 - {1358}) => r3c2<>3, r3c2<>5, r7c1<>2, r79c1<>7
  20. Row 3 / Column 6 → 5 (Hidden Single)
  21. Row 2 / Column 2 → 5 (Hidden Single)
  22. Row 9 / Column 4 → 5 (Hidden Single)
  23. Locked Candidates Type 1 (Pointing): 3 in b1 => r79c1<>3
  24. XY-Chain: 1 1- r3c8 -9- r9c8 -8- r9c1 -6- r7c1 -1 => r3c1<>1
  25. Discontinuous Nice Loop: 1/2/7 r7c3 =4= r7c6 -4- r2c6 =4= r3c5 =1= r3c8 =9= r9c8 -9- r9c5 -4- r9c3 =4= r7c3 => r7c3<>1, r7c3<>2, r7c3<>7
  26. Row 7 / Column 3 → 4 (Naked Single)
  27. Locked Candidates Type 1 (Pointing): 2 in b7 => r8c456<>2
  28. Locked Candidates Type 2 (Claiming): 2 in c5 => r1c6<>2
  29. Row 1 / Column 6 → 3 (Naked Single)
  30. Row 9 / Column 2 → 3 (Hidden Single)
  31. 2-String Kite: 1 in r2c3,r7c4 (connected by r7c1,r8c3) => r2c4<>1
  32. Row 2 / Column 4 → 9 (Naked Single)
  33. Row 2 / Column 6 → 4 (Naked Single)
  34. Row 4 / Column 4 → 2 (Naked Single)
  35. Row 4 / Column 6 → 9 (Full House)
  36. Row 9 / Column 5 → 4 (Hidden Single)
  37. Row 7 / Column 6 → 2 (Hidden Single)
  38. Row 9 / Column 8 → 9 (Hidden Single)
  39. Row 3 / Column 8 → 1 (Naked Single)
  40. Row 1 / Column 8 → 8 (Full House)
  41. Row 8 / Column 7 → 8 (Naked Single)
  42. Row 3 / Column 5 → 2 (Naked Single)
  43. Row 1 / Column 5 → 1 (Full House)
  44. Row 8 / Column 5 → 9 (Full House)
  45. Row 1 / Column 7 → 7 (Naked Single)
  46. Row 1 / Column 1 → 2 (Full House)
  47. Row 2 / Column 7 → 3 (Naked Single)
  48. Row 3 / Column 2 → 7 (Naked Single)
  49. Row 8 / Column 2 → 2 (Full House)
  50. Row 5 / Column 1 → 7 (Naked Single)
  51. Row 5 / Column 3 → 2 (Full House)
  52. Row 3 / Column 9 → 4 (Naked Single)
  53. Row 3 / Column 7 → 9 (Full House)
  54. Row 3 / Column 1 → 3 (Full House)
  55. Row 7 / Column 7 → 6 (Naked Single)
  56. Row 6 / Column 7 → 4 (Full House)
  57. Row 6 / Column 9 → 6 (Full House)
  58. Row 7 / Column 1 → 1 (Naked Single)
  59. Row 2 / Column 1 → 8 (Naked Single)
  60. Row 2 / Column 3 → 1 (Full House)
  61. Row 9 / Column 1 → 6 (Full House)
  62. Row 7 / Column 4 → 3 (Naked Single)
  63. Row 7 / Column 9 → 7 (Full House)
  64. Row 8 / Column 4 → 1 (Full House)
  65. Row 8 / Column 9 → 3 (Full House)
  66. Row 8 / Column 3 → 7 (Naked Single)
  67. Row 8 / Column 6 → 6 (Full House)
  68. Row 9 / Column 6 → 7 (Full House)
  69. Row 9 / Column 3 → 8 (Full House)
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