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

This Sudoku Puzzle has 97 steps and it is solved using Locked Candidates Type 1 (Pointing), Hidden Pair, Finned Swordfish, Locked Candidates Type 2 (Claiming), Discontinuous Nice Loop, undefined, AIC, Naked Single, Hidden Single, Empty Rectangle, Sue de Coq, Naked Pair, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 3 in b8 => r9c13<>3
  2. Hidden Pair: 2,8 in r2c2,r3c3 => r2c2,r3c3<>4, r2c2,r3c3<>9, r3c3<>3, r3c3<>6
  3. Hidden Pair: 2,8 in r7c8,r9c7 => r7c8<>6, r9c7<>5, r9c7<>7
  4. Locked Candidates Type 1 (Pointing): 7 in b9 => r3c9<>7
  5. Finned Swordfish: 2 r359 c367 fr9c5 => r7c6<>2
  6. Hidden Pair: 2,3 in r59c6 => r59c6<>4, r59c6<>5
  7. Locked Candidates Type 2 (Claiming): 5 in c6 => r1c5,r2c4<>5
  8. Discontinuous Nice Loop: 4 r1c6 -4- r2c4 -9- r2c9 -5- r2c6 =5= r1c6 => r1c6<>4
  9. Discontinuous Nice Loop: 5 r2c8 -5- r2c9 -9- r2c4 -4- r3c6 -8- r3c3 -2- r3c7 =2= r2c8 => r2c8<>5
  10. Discontinuous Nice Loop: 1 r7c5 -1- r7c6 -4- r3c6 -8- r3c3 -2- r3c7 =2= r9c7 -2- r7c8 =2= r7c5 => r7c5<>1
  11. W-Wing: 5/1 in r1c6,r8c7 connected by 1 in r7c69 => r1c7<>5
  12. Discontinuous Nice Loop: 5 r4c9 -5- r2c9 =5= r1c8 -5- r8c8 -6- r4c8 =6= r4c9 => r4c9<>5
  13. Discontinuous Nice Loop: 5 r9c9 -5- r2c9 =5= r2c6 -5- r1c6 -1- r7c6 =1= r7c9 =7= r9c9 => r9c9<>5
  14. Locked Candidates Type 1 (Pointing): 5 in b9 => r8c5<>5
  15. AIC: 2 2- r3c3 -8- r3c6 -4- r7c6 -1- r7c9 =1= r8c7 =5= r8c8 =6= r4c8 =8= r7c8 =2= r2c8 -2- r2c2 =2= r4c2 -2 => r2c2,r45c3<>2
  16. Row 2 / Column 2 → 8 (Naked Single)
  17. Row 3 / Column 3 → 2 (Naked Single)
  18. Row 2 / Column 8 → 2 (Hidden Single)
  19. Row 7 / Column 8 → 8 (Naked Single)
  20. Row 9 / Column 7 → 2 (Naked Single)
  21. Row 9 / Column 6 → 3 (Naked Single)
  22. Row 5 / Column 6 → 2 (Naked Single)
  23. Row 4 / Column 2 → 2 (Hidden Single)
  24. Row 3 / Column 6 → 8 (Hidden Single)
  25. Row 9 / Column 3 → 8 (Hidden Single)
  26. Row 7 / Column 5 → 2 (Hidden Single)
  27. Row 4 / Column 7 → 8 (Hidden Single)
  28. Empty Rectangle: 4 in b7 (r27c6) => r2c1<>4
  29. Locked Candidates Type 2 (Claiming): 4 in r2 => r13c5,r3c4<>4
  30. Sue de Coq: r13c5 - {1679} (r469c5 - {4567}, r12c6,r2c4 - {1459}) => r3c4<>9, r8c5<>6
  31. AIC: 1/6 6- r1c3 =6= r8c3 -6- r8c8 -5- r8c7 -1- r8c5 =1= r1c5 -1 => r1c3<>1, r1c5<>6
  32. Locked Candidates Type 1 (Pointing): 1 in b1 => r5c1<>1
  33. Locked Candidates Type 1 (Pointing): 6 in b2 => r3c1<>6
  34. Discontinuous Nice Loop: 3 r1c3 -3- r1c8 =3= r3c9 -3- r4c9 -6- r4c8 =6= r8c8 -6- r8c3 =6= r1c3 => r1c3<>3
  35. Discontinuous Nice Loop: 4 r1c3 -4- r4c3 -3- r4c9 -6- r4c8 =6= r8c8 -6- r8c3 =6= r1c3 => r1c3<>4
  36. Locked Candidates Type 2 (Claiming): 4 in c3 => r45c1,r6c2<>4
  37. AIC: 4 4- r1c2 =4= r7c2 -4- r7c6 -1- r7c9 =1= r8c7 =5= r8c8 =6= r4c8 -6- r4c9 -3- r3c9 =3= r3c1 =4= r3c7 -4 => r1c78,r3c1<>4
  38. Row 3 / Column 7 → 4 (Hidden Single)
  39. Row 1 / Column 7 → 7 (Hidden Single)
  40. Locked Candidates Type 1 (Pointing): 9 in b3 => r5c9<>9
  41. Naked Pair: 3,9 in r3c19 => r3c5<>9
  42. Discontinuous Nice Loop: 3/4/9 r6c3 =1= r6c7 -1- r8c7 =1= r8c5 =9= r1c5 -9- r2c4 -4- r5c4 =4= r5c3 =1= r6c3 => r6c3<>3, r6c3<>4, r6c3<>9
  43. Row 6 / Column 3 → 1 (Naked Single)
  44. AIC: 4 4- r2c4 -9- r7c4 =9= r8c5 =1= r8c7 =5= r8c8 =6= r4c8 -6- r4c9 -3- r4c3 -4- r5c3 =4= r5c4 -4 => r679c4<>4
  45. XY-Chain: 6 6- r7c4 -9- r8c5 -1- r8c7 -5- r8c8 -6 => r7c9<>6
  46. Sue de Coq: r7c12 - {4679} (r7c69 - {147}, r8c23 - {369}) => r9c1<>6
  47. AIC: 9 9- r1c3 -6- r1c1 =6= r7c1 -6- r7c4 -9- r2c4 =9= r1c5 -9 => r1c12<>9
  48. XY-Chain: 4 4- r1c2 -3- r1c8 -5- r8c8 -6- r9c9 -7- r9c1 -4 => r1c1,r7c2<>4
  49. Row 1 / Column 2 → 4 (Hidden Single)
  50. Locked Candidates Type 1 (Pointing): 3 in b1 => r45c1<>3
  51. W-Wing: 5/9 in r2c9,r5c1 connected by 9 in r3c19 => r5c9<>5
  52. Row 2 / Column 9 → 5 (Hidden Single)
  53. Row 1 / Column 8 → 3 (Naked Single)
  54. Row 3 / Column 9 → 9 (Full House)
  55. Row 3 / Column 1 → 3 (Naked Single)
  56. Row 1 / Column 6 → 5 (Hidden Single)
  57. Sue de Coq: r7c46 - {1469} (r7c29 - {179}, r9c45 - {456}) => r7c1<>7, r7c1<>9
  58. XY-Chain: 9 9- r5c1 -5- r4c1 -7- r9c1 -4- r7c1 -6- r7c4 -9- r8c5 -1- r8c7 -5- r6c7 -9 => r5c7,r6c2<>9
  59. Row 6 / Column 7 → 9 (Hidden Single)
  60. Locked Candidates Type 2 (Claiming): 9 in c2 => r8c3<>9
  61. W-Wing: 3/6 in r4c9,r8c3 connected by 6 in r48c8 => r4c3<>3
  62. Row 4 / Column 3 → 4 (Naked Single)
  63. Row 4 / Column 9 → 3 (Hidden Single)
  64. Row 5 / Column 9 → 1 (Naked Single)
  65. Row 5 / Column 7 → 5 (Naked Single)
  66. Row 8 / Column 7 → 1 (Full House)
  67. Row 7 / Column 9 → 7 (Naked Single)
  68. Row 9 / Column 9 → 6 (Full House)
  69. Row 8 / Column 8 → 5 (Full House)
  70. Row 4 / Column 8 → 6 (Naked Single)
  71. Row 6 / Column 8 → 4 (Full House)
  72. Row 5 / Column 1 → 9 (Naked Single)
  73. Row 8 / Column 5 → 9 (Naked Single)
  74. Row 7 / Column 2 → 9 (Naked Single)
  75. Row 9 / Column 4 → 5 (Naked Single)
  76. Row 2 / Column 1 → 1 (Naked Single)
  77. Row 5 / Column 3 → 3 (Naked Single)
  78. Row 5 / Column 4 → 4 (Full House)
  79. Row 1 / Column 5 → 1 (Naked Single)
  80. Row 7 / Column 4 → 6 (Naked Single)
  81. Row 8 / Column 2 → 3 (Naked Single)
  82. Row 6 / Column 2 → 7 (Full House)
  83. Row 8 / Column 3 → 6 (Full House)
  84. Row 4 / Column 1 → 5 (Full House)
  85. Row 1 / Column 3 → 9 (Full House)
  86. Row 1 / Column 1 → 6 (Full House)
  87. Row 4 / Column 5 → 7 (Full House)
  88. Row 9 / Column 5 → 4 (Naked Single)
  89. Row 7 / Column 6 → 1 (Full House)
  90. Row 2 / Column 6 → 4 (Full House)
  91. Row 2 / Column 4 → 9 (Full House)
  92. Row 7 / Column 1 → 4 (Full House)
  93. Row 9 / Column 1 → 7 (Full House)
  94. Row 3 / Column 4 → 7 (Naked Single)
  95. Row 6 / Column 4 → 3 (Full House)
  96. Row 6 / Column 5 → 5 (Full House)
  97. Row 3 / Column 5 → 6 (Full House)
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