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

This Sudoku Puzzle has 81 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Locked Candidates Type 2 (Claiming), Finned Swordfish, AIC, Discontinuous Nice Loop, Naked Triple, Naked Pair, Continuous Nice Loop, Skyscraper, Locked Pair, Full House, Sue de Coq, Swordfish techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 9 / Column 4 → 1 (Naked Single)
  2. Row 4 / Column 1 → 9 (Hidden Single)
  3. Row 6 / Column 9 → 5 (Hidden Single)
  4. Row 4 / Column 3 → 8 (Hidden Single)
  5. Row 4 / Column 9 → 7 (Hidden Single)
  6. Row 2 / Column 1 → 8 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 2 in b4 => r5c6<>2
  8. Locked Candidates Type 1 (Pointing): 7 in b8 => r7c12<>7
  9. Locked Candidates Type 1 (Pointing): 3 in b9 => r5c8<>3
  10. XY-Wing: 4/6/3 in r4c7,r5c48 => r4c5<>3
  11. Row 4 / Column 7 → 3 (Hidden Single)
  12. Locked Candidates Type 2 (Claiming): 4 in r4 => r5c6,r6c5<>4
  13. Finned Swordfish: 6 r268 c579 fr2c6 => r3c5<>6
  14. AIC: 2/4 2- r3c9 =2= r1c7 =1= r1c6 -1- r5c6 -6- r5c8 -4- r7c8 =4= r7c9 -4 => r7c9<>2, r3c9<>4
  15. Discontinuous Nice Loop: 6 r8c7 -6- r6c7 =6= r6c5 =1= r2c5 -1- r1c6 =1= r1c7 =2= r8c7 => r8c7<>6
  16. Naked Triple: 1,2,7 in r8c137 => r8c59<>2, r8c9<>1
  17. Naked Triple: 2,6,9 in r389c9 => r27c9<>6, r2c9<>9
  18. XYZ-Wing: 1/2/4 in r18c7,r2c9 => r2c7<>1
  19. Naked Pair: 4,6 in r26c7 => r1c7<>4
  20. Finned Swordfish: 1 r158 c167 fr5c2 => r6c1<>1
  21. XY-Chain: 1 1- r2c9 -4- r2c7 -6- r6c7 -4- r5c8 -6- r5c6 -1 => r2c6<>1
  22. Continuous Nice Loop: 3/4 6= r6c5 =1= r2c5 -1- r2c9 -4- r2c7 -6- r6c7 =6= r6c5 =1 => r6c5<>3, r13c8,r2c236<>4
  23. Row 5 / Column 4 → 3 (Hidden Single)
  24. Locked Candidates Type 1 (Pointing): 4 in b3 => r2c5<>4
  25. Skyscraper: 6 in r7c4,r8c9 (connected by r3c49) => r7c8,r8c5<>6
  26. Row 8 / Column 5 → 9 (Naked Single)
  27. Row 8 / Column 9 → 6 (Naked Single)
  28. 2-String Kite: 6 in r2c7,r5c6 (connected by r5c8,r6c7) => r2c6<>6
  29. Row 2 / Column 6 → 9 (Naked Single)
  30. Locked Pair: 3,5 in r2c23 => r2c5,r3c12<>3
  31. Row 3 / Column 5 → 3 (Hidden Single)
  32. Row 4 / Column 5 → 4 (Hidden Single)
  33. Row 4 / Column 6 → 2 (Full House)
  34. Row 9 / Column 6 → 5 (Naked Single)
  35. Row 7 / Column 5 → 2 (Hidden Single)
  36. 2-String Kite: 2 in r1c7,r9c2 (connected by r8c7,r9c9) => r1c2<>2
  37. Sue de Coq: r79c2 - {1235} (r2c2 - {35}, r8c13 - {127}) => r7c1<>1, r5c2<>5, r6c2<>3
  38. Swordfish: 1 r267 c259 => r5c2<>1
  39. Sue de Coq: r56c2 - {1247} (r279c2 - {1235}, r6c13 - {347}) => r5c3<>4, r3c2<>2
  40. Skyscraper: 2 in r3c1,r9c2 (connected by r39c9) => r8c1<>2
  41. X-Wing: 2 r18 c37 => r5c3<>2
  42. Row 5 / Column 3 → 5 (Naked Single)
  43. Row 2 / Column 3 → 3 (Naked Single)
  44. Row 2 / Column 2 → 5 (Naked Single)
  45. Row 7 / Column 1 → 5 (Hidden Single)
  46. Row 6 / Column 1 → 3 (Hidden Single)
  47. XY-Wing: 4/7/2 in r5c2,r68c3 => r9c2<>2
  48. Row 9 / Column 2 → 3 (Naked Single)
  49. Row 7 / Column 2 → 1 (Naked Single)
  50. Row 9 / Column 8 → 9 (Naked Single)
  51. Row 9 / Column 9 → 2 (Full House)
  52. Row 7 / Column 9 → 4 (Naked Single)
  53. Row 8 / Column 1 → 7 (Naked Single)
  54. Row 8 / Column 3 → 2 (Full House)
  55. Row 8 / Column 7 → 1 (Full House)
  56. Row 7 / Column 8 → 3 (Full House)
  57. Row 1 / Column 8 → 8 (Naked Single)
  58. Row 3 / Column 9 → 9 (Naked Single)
  59. Row 2 / Column 9 → 1 (Full House)
  60. Row 3 / Column 1 → 2 (Naked Single)
  61. Row 5 / Column 1 → 1 (Full House)
  62. Row 1 / Column 7 → 2 (Naked Single)
  63. Row 1 / Column 4 → 7 (Naked Single)
  64. Row 3 / Column 8 → 6 (Naked Single)
  65. Row 2 / Column 7 → 4 (Full House)
  66. Row 2 / Column 5 → 6 (Full House)
  67. Row 5 / Column 8 → 4 (Full House)
  68. Row 6 / Column 7 → 6 (Full House)
  69. Row 6 / Column 5 → 1 (Full House)
  70. Row 5 / Column 6 → 6 (Full House)
  71. Row 5 / Column 2 → 2 (Full House)
  72. Row 1 / Column 3 → 4 (Naked Single)
  73. Row 6 / Column 3 → 7 (Full House)
  74. Row 6 / Column 2 → 4 (Full House)
  75. Row 7 / Column 4 → 6 (Naked Single)
  76. Row 3 / Column 4 → 8 (Full House)
  77. Row 7 / Column 6 → 7 (Full House)
  78. Row 3 / Column 6 → 4 (Naked Single)
  79. Row 1 / Column 6 → 1 (Full House)
  80. Row 1 / Column 2 → 9 (Full House)
  81. Row 3 / Column 2 → 7 (Full House)
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