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

This Sudoku Puzzle has 92 steps and it is solved using Finned Swordfish, AIC, Discontinuous Nice Loop, Locked Candidates Type 2 (Claiming), Hidden Single, Hidden Pair, Continuous Nice Loop, Naked Pair, undefined, Locked Pair, Naked Single, Full House, Skyscraper, Naked Triple, Turbot Fish, Sue de Coq, Locked Candidates Type 1 (Pointing) 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. Finned Swordfish: 4 r247 c689 fr4c5 => r56c6<>4
  2. AIC: 2/3 2- r3c7 =2= r3c9 =5= r7c9 =4= r7c8 =3= r9c7 -3 => r9c7<>2, r3c7<>3
  3. Discontinuous Nice Loop: 3 r1c3 -3- r1c8 -4- r7c8 =4= r7c9 =5= r3c9 -5- r1c7 =5= r1c3 => r1c3<>3
  4. Locked Candidates Type 2 (Claiming): 3 in r1 => r2c8<>3
  5. AIC: 5 5- r1c3 -7- r8c3 -9- r8c8 =9= r7c8 =4= r7c9 =5= r3c9 -5 => r1c7,r3c13<>5
  6. Row 1 / Column 3 → 5 (Hidden Single)
  7. Row 4 / Column 1 → 5 (Hidden Single)
  8. Hidden Pair: 2,5 in r3c79 => r3c79<>6, r3c79<>8
  9. Row 3 / Column 1 → 6 (Hidden Single)
  10. Locked Candidates Type 2 (Claiming): 8 in r3 => r1c5,r2c46<>8
  11. Continuous Nice Loop: 2/4/8 8= r1c7 =3= r1c8 -3- r7c8 =3= r7c1 =8= r2c1 -8- r2c9 =8= r1c7 =3 => r7c1<>2, r1c7<>4, r2c2<>8
  12. Locked Candidates Type 2 (Claiming): 4 in c7 => r4c89,r5c9,r6c8<>4
  13. Locked Candidates Type 2 (Claiming): 4 in r4 => r6c5<>4
  14. AIC: 5/6 6- r8c4 =6= r9c5 -6- r9c9 -2- r3c9 -5- r3c7 =5= r8c7 -5 => r8c4<>5, r8c7<>6
  15. Naked Pair: 2,5 in r38c7 => r56c7<>2
  16. Sashimi X-Wing: 6 r58 c48 fr5c7 fr5c9 => r46c8<>6
  17. Locked Pair: 1,2 in r46c8 => r45c9,r78c8<>2
  18. Finned Swordfish: 6 r258 c489 fr5c7 => r4c9<>6
  19. Row 4 / Column 9 → 7 (Naked Single)
  20. XY-Chain: 7 7- r1c2 -8- r1c7 -3- r9c7 -6- r8c8 -9- r8c3 -7 => r8c2<>7
  21. XY-Chain: 9 9- r2c2 -7- r1c2 -8- r1c7 -3- r9c7 -6- r8c8 -9 => r8c2<>9
  22. Discontinuous Nice Loop: 7 r2c2 =9= r7c2 =1= r9c3 =3= r3c3 =9= r2c2 => r2c2<>7
  23. Row 2 / Column 2 → 9 (Naked Single)
  24. Row 3 / Column 3 → 3 (Naked Single)
  25. Hidden Pair: 3,4 in r24c6 => r2c6<>7, r4c6<>2
  26. 2-String Kite: 7 in r2c4,r6c2 (connected by r1c2,r2c1) => r6c4<>7
  27. XY-Chain: 7 7- r2c4 -3- r2c6 -4- r2c8 -6- r8c8 -9- r8c3 -7 => r8c4<>7
  28. AIC: 8 8- r1c7 -3- r9c7 -6- r9c5 =6= r8c4 -6- r4c4 -3- r2c4 -7- r2c1 -8- r2c9 =8= r5c9 -8 => r2c9,r56c7<>8
  29. Row 2 / Column 1 → 8 (Hidden Single)
  30. Row 1 / Column 2 → 7 (Full House)
  31. Row 7 / Column 1 → 3 (Naked Single)
  32. Row 1 / Column 5 → 4 (Naked Single)
  33. Row 1 / Column 8 → 3 (Naked Single)
  34. Row 1 / Column 7 → 8 (Full House)
  35. Row 2 / Column 6 → 3 (Naked Single)
  36. Row 2 / Column 4 → 7 (Naked Single)
  37. Row 4 / Column 6 → 4 (Naked Single)
  38. Row 5 / Column 9 → 8 (Hidden Single)
  39. Row 9 / Column 7 → 3 (Hidden Single)
  40. Row 4 / Column 4 → 3 (Hidden Single)
  41. Skyscraper: 7 in r5c1,r6c5 (connected by r9c15) => r5c6,r6c3<>7
  42. Naked Triple: 2,6,9 in r4c5,r5c46 => r6c45<>6, r6c56<>2
  43. Turbot Fish: 2 r4c5 =2= r5c6 -2- r5c1 =2= r9c1 => r9c5<>2
  44. Sue de Coq: r8c23 - {2789} (r8c48 - {689}, r9c1 - {27}) => r7c2<>2, r9c3<>7, r8c6<>8, r8c6<>9
  45. Turbot Fish: 2 r5c6 =2= r5c1 -2- r9c1 =2= r8c2 => r8c6<>2
  46. Sue de Coq: r8c78 - {2569} (r8c36 - {579}, r9c9 - {26}) => r7c9<>2, r8c4<>9
  47. Locked Candidates Type 2 (Claiming): 2 in r7 => r9c6<>2
  48. XY-Chain: 1 1- r4c8 -2- r4c5 -6- r5c4 -9- r5c6 -2- r5c1 -7- r5c3 -4- r6c3 -1 => r4c2,r6c8<>1
  49. Row 6 / Column 8 → 2 (Naked Single)
  50. Row 4 / Column 8 → 1 (Naked Single)
  51. XY-Chain: 5 5- r6c4 -8- r8c4 -6- r8c8 -9- r8c3 -7- r8c6 -5 => r6c6,r7c4<>5
  52. Row 6 / Column 4 → 5 (Hidden Single)
  53. XY-Chain: 9 9- r5c4 -6- r8c4 -8- r8c2 -2- r8c7 -5- r7c9 -4- r7c8 -9 => r7c4<>9
  54. Naked Pair: 1,8 in r7c24 => r7c56<>8, r7c6<>1
  55. Locked Candidates Type 1 (Pointing): 8 in b8 => r3c4<>8
  56. XY-Chain: 2 2- r4c2 -6- r4c5 -2- r7c5 -9- r7c8 -4- r7c9 -5- r8c7 -2- r8c2 -8- r8c4 -6- r5c4 -9- r5c6 -2 => r4c5,r5c1<>2
  57. Row 4 / Column 5 → 6 (Naked Single)
  58. Row 4 / Column 2 → 2 (Full House)
  59. Row 5 / Column 1 → 7 (Naked Single)
  60. Row 9 / Column 1 → 2 (Full House)
  61. Row 5 / Column 4 → 9 (Naked Single)
  62. Row 8 / Column 2 → 8 (Naked Single)
  63. Row 5 / Column 3 → 4 (Naked Single)
  64. Row 9 / Column 9 → 6 (Naked Single)
  65. Row 3 / Column 4 → 1 (Naked Single)
  66. Row 5 / Column 6 → 2 (Naked Single)
  67. Row 5 / Column 7 → 6 (Full House)
  68. Row 6 / Column 7 → 4 (Full House)
  69. Row 7 / Column 2 → 1 (Naked Single)
  70. Row 6 / Column 2 → 6 (Full House)
  71. Row 6 / Column 3 → 1 (Full House)
  72. Row 8 / Column 4 → 6 (Naked Single)
  73. Row 7 / Column 4 → 8 (Full House)
  74. Row 2 / Column 9 → 4 (Naked Single)
  75. Row 2 / Column 8 → 6 (Full House)
  76. Row 8 / Column 8 → 9 (Naked Single)
  77. Row 7 / Column 8 → 4 (Full House)
  78. Row 9 / Column 3 → 9 (Naked Single)
  79. Row 8 / Column 3 → 7 (Full House)
  80. Row 7 / Column 9 → 5 (Naked Single)
  81. Row 3 / Column 9 → 2 (Full House)
  82. Row 8 / Column 7 → 2 (Full House)
  83. Row 8 / Column 6 → 5 (Full House)
  84. Row 3 / Column 7 → 5 (Full House)
  85. Row 9 / Column 5 → 7 (Naked Single)
  86. Row 9 / Column 6 → 1 (Full House)
  87. Row 7 / Column 6 → 9 (Naked Single)
  88. Row 7 / Column 5 → 2 (Full House)
  89. Row 6 / Column 5 → 8 (Naked Single)
  90. Row 3 / Column 5 → 9 (Full House)
  91. Row 3 / Column 6 → 8 (Full House)
  92. Row 6 / Column 6 → 7 (Full House)
Show More...