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

This Sudoku Puzzle has 66 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Sue de Coq, Hidden Rectangle techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 8 / Column 7 → 3 (Naked Single)
  2. Row 9 / Column 9 → 2 (Naked Single)
  3. Row 7 / Column 8 → 6 (Full House)
  4. Row 6 / Column 9 → 3 (Naked Single)
  5. Row 2 / Column 9 → 4 (Naked Single)
  6. Row 5 / Column 9 → 7 (Full House)
  7. Row 2 / Column 1 → 1 (Hidden Single)
  8. Row 3 / Column 8 → 7 (Hidden Single)
  9. Row 8 / Column 6 → 7 (Hidden Single)
  10. Row 1 / Column 7 → 6 (Hidden Single)
  11. Row 4 / Column 2 → 7 (Hidden Single)
  12. Row 2 / Column 8 → 3 (Hidden Single)
  13. Row 2 / Column 7 → 9 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 6 in b1 => r3c4<>6
  15. Locked Candidates Type 1 (Pointing): 4 in b7 => r7c456<>4
  16. Row 5 / Column 6 → 4 (Hidden Single)
  17. Row 4 / Column 8 → 4 (Hidden Single)
  18. Locked Candidates Type 2 (Claiming): 2 in r2 => r13c5,r3c4<>2
  19. Locked Candidates Type 2 (Claiming): 3 in c6 => r7c45,r9c45<>3
  20. XY-Chain: 8 8- r6c6 -2- r2c6 -6- r2c4 -2- r7c4 -5- r9c5 -8 => r5c5,r79c6<>8
  21. Row 6 / Column 6 → 8 (Hidden Single)
  22. Finned X-Wing: 2 r16 c18 fr6c7 => r5c8<>2
  23. Sue de Coq: r7c123 - {13458} (r7c46 - {235}, r8c3,r9c2 - {189}) => r9c3<>9, r7c5<>2, r7c5<>5
  24. Row 5 / Column 5 → 2 (Hidden Single)
  25. Row 4 / Column 4 → 3 (Full House)
  26. Row 3 / Column 5 → 3 (Hidden Single)
  27. XY-Chain: 8 8- r4c1 -2- r1c1 -4- r1c5 -5- r1c8 -2- r3c7 -5- r5c7 -8 => r4c7,r5c12<>8
  28. Row 4 / Column 1 → 8 (Hidden Single)
  29. Row 5 / Column 7 → 8 (Hidden Single)
  30. Hidden Rectangle: 6/9 in r3c23,r5c23 => r3c3<>9
  31. XY-Chain: 2 2- r3c7 -5- r3c4 -4- r8c4 -9- r8c3 -1- r4c3 -2 => r3c3,r4c7<>2
  32. Row 3 / Column 3 → 6 (Naked Single)
  33. Row 4 / Column 7 → 1 (Naked Single)
  34. Row 4 / Column 3 → 2 (Full House)
  35. Row 5 / Column 2 → 6 (Hidden Single)
  36. Row 6 / Column 2 → 1 (Hidden Single)
  37. W-Wing: 4/9 in r3c2,r8c4 connected by 9 in r9c24 => r3c4<>4
  38. Row 3 / Column 4 → 5 (Naked Single)
  39. Row 1 / Column 5 → 4 (Naked Single)
  40. Row 3 / Column 7 → 2 (Naked Single)
  41. Row 1 / Column 8 → 5 (Full House)
  42. Row 1 / Column 1 → 2 (Full House)
  43. Row 6 / Column 7 → 5 (Full House)
  44. Row 7 / Column 4 → 2 (Naked Single)
  45. Row 8 / Column 5 → 1 (Naked Single)
  46. Row 5 / Column 8 → 9 (Naked Single)
  47. Row 6 / Column 8 → 2 (Full House)
  48. Row 6 / Column 1 → 9 (Full House)
  49. Row 2 / Column 4 → 6 (Naked Single)
  50. Row 2 / Column 6 → 2 (Full House)
  51. Row 7 / Column 6 → 3 (Naked Single)
  52. Row 9 / Column 6 → 6 (Full House)
  53. Row 7 / Column 5 → 8 (Naked Single)
  54. Row 9 / Column 5 → 5 (Full House)
  55. Row 8 / Column 3 → 9 (Naked Single)
  56. Row 8 / Column 4 → 4 (Full House)
  57. Row 9 / Column 4 → 9 (Full House)
  58. Row 3 / Column 1 → 4 (Naked Single)
  59. Row 3 / Column 2 → 9 (Full House)
  60. Row 7 / Column 2 → 4 (Naked Single)
  61. Row 9 / Column 2 → 8 (Full House)
  62. Row 9 / Column 3 → 3 (Full House)
  63. Row 7 / Column 1 → 5 (Naked Single)
  64. Row 5 / Column 1 → 3 (Full House)
  65. Row 5 / Column 3 → 5 (Full House)
  66. Row 7 / Column 3 → 1 (Full House)
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