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

This Sudoku Puzzle has 78 steps and it is solved using Hidden Single, Naked Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), undefined, Naked Triple, Discontinuous Nice Loop, Sue de Coq, Hidden Rectangle, Simple Colors Trap, AIC, Naked Pair techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 4 → 7 (Hidden Single)
  2. Row 1 / Column 5 → 8 (Hidden Single)
  3. Row 2 / Column 1 → 1 (Hidden Single)
  4. Row 4 / Column 1 → 6 (Naked Single)
  5. Row 7 / Column 4 → 1 (Hidden Single)
  6. Row 2 / Column 5 → 5 (Hidden Single)
  7. Row 1 / Column 1 → 5 (Hidden Single)
  8. Row 9 / Column 4 → 5 (Hidden Single)
  9. Row 4 / Column 9 → 5 (Hidden Single)
  10. Row 6 / Column 6 → 5 (Hidden Single)
  11. Row 2 / Column 7 → 9 (Hidden Single)
  12. Row 1 / Column 6 → 9 (Hidden Single)
  13. Row 1 / Column 3 → 2 (Hidden Single)
  14. Row 1 / Column 4 → 6 (Naked Single)
  15. Row 3 / Column 4 → 2 (Full House)
  16. Row 3 / Column 6 → 3 (Full House)
  17. Row 7 / Column 8 → 5 (Hidden Single)
  18. Row 5 / Column 6 → 1 (Hidden Single)
  19. Row 4 / Column 2 → 1 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 2 in b5 => r89c5<>2
  21. Locked Candidates Type 1 (Pointing): 4 in b5 => r89c5<>4
  22. Locked Candidates Type 1 (Pointing): 6 in b5 => r89c5<>6
  23. Locked Candidates Type 2 (Claiming): 3 in r7 => r8c13,r9c2<>3
  24. XYZ-Wing: 4/6/9 in r59c2,r8c3 => r7c2<>4
  25. Naked Triple: 3,6,7 in r137c2 => r9c2<>6
  26. XY-Chain: 4 4- r1c7 -7- r1c2 -3- r7c2 -6- r8c3 -4 => r8c7<>4
  27. XY-Chain: 3 3- r2c9 -6- r2c3 -3- r1c2 -7- r3c2 -6- r7c2 -3- r7c1 -2- r8c1 -9- r8c5 -3 => r8c9<>3
  28. Discontinuous Nice Loop: 6 r7c6 -6- r7c2 -3- r1c2 -7- r1c7 -4- r7c7 =4= r7c6 => r7c6<>6
  29. XY-Chain: 4 4- r7c6 -2- r7c1 -3- r7c2 -6- r8c3 -4 => r8c6<>4
  30. Sue de Coq: r8c13 - {2469} (r8c6 - {26}, r9c2 - {49}) => r8c79<>2, r8c789<>6
  31. Hidden Rectangle: 1/7 in r6c78,r8c78 => r6c8<>7
  32. Discontinuous Nice Loop: 4 r5c9 -4- r5c2 =4= r9c2 -4- r8c3 -6- r2c3 -3- r2c9 =3= r9c9 =2= r5c9 => r5c9<>4
  33. Discontinuous Nice Loop: 4 r9c7 -4- r9c2 -9- r5c2 =9= r5c1 =8= r6c1 -8- r6c7 =8= r9c7 => r9c7<>4
  34. Discontinuous Nice Loop: 3 r9c8 -3- r9c5 -9- r9c2 -4- r8c3 -6- r2c3 -3- r2c9 =3= r9c9 -3- r9c8 => r9c8<>3
  35. Discontinuous Nice Loop: 6 r9c7 -6- r7c7 =6= r7c2 =3= r7c1 -3- r6c1 -8- r6c7 =8= r9c7 => r9c7<>6
  36. Simple Colors Trap: 6 (r2c3,r6c7,r7c2,r8c6) / (r2c9,r3c2,r7c7,r8c3,r9c6) => r56c9<>6
  37. AIC: 2 2- r4c5 -4- r6c5 -6- r6c7 =6= r7c7 -6- r7c2 -3- r7c1 =3= r6c1 =8= r5c1 -8- r5c9 -2 => r4c7,r5c5<>2
  38. Row 4 / Column 5 → 2 (Hidden Single)
  39. Row 5 / Column 9 → 2 (Hidden Single)
  40. Naked Pair: 4,7 in r14c7 => r67c7<>4, r68c7<>7
  41. Row 8 / Column 7 → 1 (Naked Single)
  42. Row 7 / Column 6 → 4 (Hidden Single)
  43. Row 6 / Column 8 → 1 (Hidden Single)
  44. W-Wing: 4/7 in r4c3,r8c9 connected by 7 in r6c39 => r8c3<>4
  45. Row 8 / Column 3 → 6 (Naked Single)
  46. Row 2 / Column 3 → 3 (Naked Single)
  47. Row 2 / Column 9 → 6 (Full House)
  48. Row 7 / Column 2 → 3 (Naked Single)
  49. Row 8 / Column 6 → 2 (Naked Single)
  50. Row 9 / Column 6 → 6 (Full House)
  51. Row 1 / Column 2 → 7 (Naked Single)
  52. Row 3 / Column 2 → 6 (Full House)
  53. Row 7 / Column 1 → 2 (Naked Single)
  54. Row 7 / Column 7 → 6 (Full House)
  55. Row 8 / Column 1 → 9 (Naked Single)
  56. Row 9 / Column 2 → 4 (Full House)
  57. Row 5 / Column 2 → 9 (Full House)
  58. Row 1 / Column 7 → 4 (Naked Single)
  59. Row 1 / Column 8 → 3 (Full House)
  60. Row 6 / Column 7 → 8 (Naked Single)
  61. Row 5 / Column 1 → 8 (Naked Single)
  62. Row 6 / Column 1 → 3 (Full House)
  63. Row 8 / Column 5 → 3 (Naked Single)
  64. Row 9 / Column 5 → 9 (Full House)
  65. Row 9 / Column 8 → 8 (Naked Single)
  66. Row 4 / Column 7 → 7 (Naked Single)
  67. Row 9 / Column 7 → 2 (Full House)
  68. Row 9 / Column 9 → 3 (Full House)
  69. Row 4 / Column 3 → 4 (Full House)
  70. Row 6 / Column 3 → 7 (Full House)
  71. Row 3 / Column 8 → 7 (Naked Single)
  72. Row 3 / Column 9 → 8 (Full House)
  73. Row 6 / Column 9 → 4 (Naked Single)
  74. Row 5 / Column 8 → 6 (Full House)
  75. Row 8 / Column 8 → 4 (Full House)
  76. Row 6 / Column 5 → 6 (Full House)
  77. Row 8 / Column 9 → 7 (Full House)
  78. Row 5 / Column 5 → 4 (Full House)
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