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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Hidden Rectangle, Sue de Coq, Discontinuous Nice Loop, Continuous Nice Loop, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 9 / Column 7 → 9 (Naked Single)
  2. Row 1 / Column 4 → 1 (Hidden Single)
  3. Row 8 / Column 8 → 1 (Hidden Single)
  4. Row 2 / Column 2 → 3 (Hidden Single)
  5. Row 6 / Column 8 → 7 (Hidden Single)
  6. Row 6 / Column 3 → 3 (Hidden Single)
  7. Row 8 / Column 1 → 3 (Hidden Single)
  8. Row 4 / Column 9 → 3 (Hidden Single)
  9. Row 8 / Column 9 → 5 (Hidden Single)
  10. Row 7 / Column 7 → 6 (Naked Single)
  11. Locked Candidates Type 1 (Pointing): 2 in b3 => r1c56<>2
  12. Locked Candidates Type 1 (Pointing): 6 in b4 => r13c1<>6
  13. Locked Candidates Type 1 (Pointing): 2 in b7 => r9c5<>2
  14. X-Wing: 5 r24 c68 => r136c6,r3c8<>5
  15. 2-String Kite: 4 in r5c5,r8c2 (connected by r5c1,r6c2) => r8c5<>4
  16. 2-String Kite: 9 in r3c8,r5c5 (connected by r4c8,r5c9) => r3c5<>9
  17. Hidden Rectangle: 3/5 in r1c57,r3c57 => r1c5<>5
  18. Finned X-Wing: 4 c24 r68 fr7c4 => r8c6<>4
  19. Sue de Coq: r5c13 - {1248} (r5c7 - {12}, r46c2 - {489}) => r46c1<>8, r6c1<>4, r5c59<>2
  20. Discontinuous Nice Loop: 5/8 r1c3 =6= r1c9 =2= r1c7 -2- r5c7 -1- r5c3 =1= r3c3 =6= r1c3 => r1c3<>5, r1c3<>8
  21. Row 1 / Column 3 → 6 (Naked Single)
  22. Row 3 / Column 9 → 6 (Hidden Single)
  23. Continuous Nice Loop: 4/5/8/9 7= r1c1 =5= r1c7 -5- r6c7 =5= r6c5 =2= r8c5 =7= r8c2 -7- r1c2 =7= r1c1 =5 => r6c5<>4, r3c7<>5, r1c1,r6c5<>8, r6c5<>9
  24. Row 3 / Column 7 → 3 (Naked Single)
  25. Row 1 / Column 5 → 3 (Hidden Single)
  26. Locked Candidates Type 1 (Pointing): 9 in b2 => r46c6<>9
  27. W-Wing: 5/2 in r1c7,r6c5 connected by 2 in r16c9 => r6c7<>5
  28. Row 6 / Column 5 → 5 (Hidden Single)
  29. Row 1 / Column 7 → 5 (Hidden Single)
  30. Row 1 / Column 1 → 7 (Naked Single)
  31. Row 2 / Column 8 → 8 (Naked Single)
  32. Row 1 / Column 2 → 8 (Naked Single)
  33. Row 2 / Column 4 → 2 (Naked Single)
  34. Row 2 / Column 6 → 5 (Full House)
  35. Row 3 / Column 8 → 9 (Naked Single)
  36. Row 1 / Column 9 → 2 (Full House)
  37. Row 1 / Column 6 → 9 (Full House)
  38. Row 4 / Column 8 → 5 (Full House)
  39. Row 4 / Column 2 → 9 (Naked Single)
  40. Row 6 / Column 2 → 4 (Naked Single)
  41. Row 8 / Column 2 → 7 (Full House)
  42. Row 8 / Column 5 → 2 (Naked Single)
  43. Row 8 / Column 6 → 6 (Naked Single)
  44. Row 8 / Column 4 → 4 (Full House)
  45. Row 5 / Column 5 → 4 (Hidden Single)
  46. Row 3 / Column 5 → 8 (Naked Single)
  47. Row 3 / Column 6 → 4 (Full House)
  48. Row 9 / Column 5 → 7 (Naked Single)
  49. Row 7 / Column 5 → 9 (Full House)
  50. Row 7 / Column 4 → 8 (Full House)
  51. Row 9 / Column 9 → 4 (Naked Single)
  52. Row 7 / Column 9 → 7 (Full House)
  53. Row 4 / Column 4 → 6 (Naked Single)
  54. Row 6 / Column 4 → 9 (Full House)
  55. Row 7 / Column 3 → 5 (Naked Single)
  56. Row 7 / Column 1 → 4 (Full House)
  57. Row 4 / Column 1 → 2 (Naked Single)
  58. Row 4 / Column 6 → 8 (Full House)
  59. Row 6 / Column 6 → 2 (Full House)
  60. Row 6 / Column 9 → 8 (Naked Single)
  61. Row 5 / Column 9 → 9 (Full House)
  62. Row 3 / Column 3 → 1 (Naked Single)
  63. Row 3 / Column 1 → 5 (Full House)
  64. Row 9 / Column 1 → 8 (Naked Single)
  65. Row 9 / Column 3 → 2 (Full House)
  66. Row 5 / Column 3 → 8 (Full House)
  67. Row 6 / Column 7 → 1 (Naked Single)
  68. Row 5 / Column 7 → 2 (Full House)
  69. Row 5 / Column 1 → 1 (Full House)
  70. Row 6 / Column 1 → 6 (Full House)
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