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

This Sudoku Puzzle has 84 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Finned Swordfish, Sue de Coq, Discontinuous Nice Loop, Naked Single, Locked Candidates Type 2 (Claiming), Full House, Hidden Pair, undefined, Hidden Rectangle, AIC techniques.

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

Solution Steps:

  1. Row 4 / Column 8 → 6 (Hidden Single)
  2. Row 7 / Column 2 → 6 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 5 in b4 => r5c579<>5
  4. Row 8 / Column 5 → 5 (Hidden Single)
  5. Locked Candidates Type 1 (Pointing): 9 in b4 => r123c2<>9
  6. Locked Candidates Type 1 (Pointing): 2 in b7 => r23c1<>2
  7. Finned Swordfish: 1 c357 r579 fr4c7 => r5c9<>1
  8. Finned Swordfish: 1 c359 r579 fr4c9 fr6c9 => r5c7<>1
  9. Sue de Coq: r4c79 - {1579} (r4c46 - {145}, r5c789,r6c8 - {23789}) => r6c9<>3, r6c9<>8, r6c9<>9, r4c2<>1, r4c2<>4
  10. Locked Candidates Type 1 (Pointing): 4 in b4 => r5c5<>4
  11. Discontinuous Nice Loop: 7 r2c2 -7- r4c2 -9- r6c2 -1- r6c9 -5- r2c9 =5= r2c1 =1= r2c2 => r2c2<>7
  12. Discontinuous Nice Loop: 7 r4c7 -7- r4c2 -9- r6c2 -1- r2c2 =1= r2c1 =5= r2c9 -5- r1c7 =5= r4c7 => r4c7<>7
  13. Discontinuous Nice Loop: 7 r5c3 -7- r4c2 -9- r6c2 -1- r6c9 -5- r2c9 =5= r2c1 -5- r5c1 =5= r5c3 => r5c3<>7
  14. Discontinuous Nice Loop: 1 r6c2 -1- r6c9 -5- r2c9 =5= r2c1 =1= r2c2 -1- r6c2 => r6c2<>1
  15. Row 6 / Column 2 → 9 (Naked Single)
  16. Row 4 / Column 2 → 7 (Naked Single)
  17. Locked Candidates Type 1 (Pointing): 1 in b4 => r5c5<>1
  18. Locked Candidates Type 1 (Pointing): 1 in b5 => r789c6<>1
  19. Locked Candidates Type 2 (Claiming): 1 in r8 => r7c13,r9c13<>1
  20. Row 5 / Column 3 → 1 (Hidden Single)
  21. Row 5 / Column 2 → 4 (Naked Single)
  22. Row 5 / Column 1 → 5 (Full House)
  23. Row 1 / Column 3 → 5 (Hidden Single)
  24. Row 2 / Column 9 → 5 (Hidden Single)
  25. Row 6 / Column 9 → 1 (Naked Single)
  26. Row 4 / Column 9 → 9 (Naked Single)
  27. Row 4 / Column 7 → 5 (Naked Single)
  28. Row 4 / Column 4 → 4 (Naked Single)
  29. Row 4 / Column 6 → 1 (Full House)
  30. Row 6 / Column 4 → 5 (Hidden Single)
  31. Locked Candidates Type 1 (Pointing): 7 in b1 => r789c1<>7
  32. Locked Candidates Type 2 (Claiming): 7 in r8 => r79c6,r9c4<>7
  33. Locked Candidates Type 2 (Claiming): 3 in c4 => r7c56,r89c6,r9c5<>3
  34. Hidden Pair: 1,9 in r7c57 => r7c5<>4, r7c7<>7
  35. X-Wing: 9 c48 r29 => r2c15,r9c57<>9
  36. W-Wing: 8/3 in r1c2,r5c5 connected by 3 in r16c6 => r1c5<>8
  37. XYZ-Wing: 4/7/8 in r2c56,r8c6 => r1c6<>4
  38. Hidden Rectangle: 2/4 in r7c16,r9c16 => r9c1<>4
  39. Finned Swordfish: 8 r168 c268 fr1c7 fr1c9 => r2c8<>8
  40. Finned Swordfish: 8 r268 c268 fr2c5 => r1c6<>8
  41. AIC: 9 9- r2c4 =9= r2c8 =2= r2c2 =1= r8c2 =8= r8c8 -8- r6c8 -3- r6c6 =3= r1c6 -3- r1c2 -8- r1c7 -9- r7c7 =9= r7c5 -9 => r13c5,r9c4<>9
  42. Row 9 / Column 4 → 3 (Naked Single)
  43. Row 8 / Column 4 → 7 (Naked Single)
  44. Row 2 / Column 4 → 9 (Full House)
  45. Row 9 / Column 1 → 2 (Naked Single)
  46. Row 8 / Column 6 → 4 (Naked Single)
  47. Row 7 / Column 6 → 2 (Naked Single)
  48. Row 9 / Column 6 → 6 (Naked Single)
  49. Row 9 / Column 5 → 1 (Naked Single)
  50. Row 7 / Column 5 → 9 (Full House)
  51. Row 7 / Column 7 → 1 (Naked Single)
  52. Row 9 / Column 8 → 9 (Hidden Single)
  53. Row 2 / Column 8 → 4 (Hidden Single)
  54. Row 2 / Column 5 → 8 (Naked Single)
  55. Row 2 / Column 6 → 7 (Naked Single)
  56. Row 5 / Column 5 → 3 (Naked Single)
  57. Row 6 / Column 6 → 8 (Full House)
  58. Row 1 / Column 6 → 3 (Full House)
  59. Row 6 / Column 8 → 3 (Full House)
  60. Row 2 / Column 1 → 1 (Naked Single)
  61. Row 2 / Column 2 → 2 (Full House)
  62. Row 1 / Column 2 → 8 (Naked Single)
  63. Row 8 / Column 8 → 8 (Naked Single)
  64. Row 5 / Column 8 → 2 (Full House)
  65. Row 8 / Column 1 → 3 (Naked Single)
  66. Row 8 / Column 2 → 1 (Full House)
  67. Row 3 / Column 2 → 3 (Full House)
  68. Row 1 / Column 7 → 9 (Naked Single)
  69. Row 1 / Column 9 → 6 (Naked Single)
  70. Row 3 / Column 3 → 4 (Naked Single)
  71. Row 9 / Column 7 → 7 (Naked Single)
  72. Row 7 / Column 1 → 4 (Naked Single)
  73. Row 1 / Column 5 → 4 (Naked Single)
  74. Row 1 / Column 1 → 7 (Full House)
  75. Row 3 / Column 1 → 9 (Full House)
  76. Row 3 / Column 5 → 6 (Full House)
  77. Row 3 / Column 9 → 8 (Naked Single)
  78. Row 3 / Column 7 → 2 (Full House)
  79. Row 5 / Column 7 → 8 (Full House)
  80. Row 5 / Column 9 → 7 (Full House)
  81. Row 7 / Column 3 → 7 (Naked Single)
  82. Row 9 / Column 3 → 8 (Full House)
  83. Row 9 / Column 9 → 4 (Full House)
  84. Row 7 / Column 9 → 3 (Full House)
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