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

This Sudoku Puzzle has 77 steps and it is solved using Hidden Single, Full House, Locked Candidates Type 2 (Claiming), undefined, Hidden Pair, Locked Candidates Type 1 (Pointing), Finned Swordfish, AIC, Naked Single, Bivalue Universal Grave + 1 techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 2 / Column 1 → 2 (Hidden Single)
  2. Row 9 / Column 1 → 4 (Hidden Single)
  3. Row 7 / Column 5 → 6 (Hidden Single)
  4. Row 9 / Column 5 → 2 (Hidden Single)
  5. Row 8 / Column 9 → 2 (Hidden Single)
  6. Row 7 / Column 3 → 2 (Hidden Single)
  7. Row 1 / Column 5 → 3 (Hidden Single)
  8. Row 4 / Column 4 → 2 (Hidden Single)
  9. Row 6 / Column 7 → 2 (Hidden Single)
  10. Row 2 / Column 9 → 3 (Hidden Single)
  11. Row 1 / Column 9 → 4 (Hidden Single)
  12. Row 3 / Column 5 → 4 (Hidden Single)
  13. Row 5 / Column 5 → 1 (Full House)
  14. Row 7 / Column 7 → 3 (Hidden Single)
  15. Row 5 / Column 6 → 4 (Hidden Single)
  16. Row 7 / Column 8 → 9 (Hidden Single)
  17. Locked Candidates Type 2 (Claiming): 9 in r2 => r3c4<>9
  18. Locked Candidates Type 2 (Claiming): 8 in r8 => r9c46<>8
  19. X-Wing: 7 c28 r68 => r6c13<>7
  20. Hidden Pair: 4,7 in r6c28 => r6c28<>1, r6c2<>6
  21. Locked Candidates Type 1 (Pointing): 1 in b6 => r4c123<>1
  22. 2-String Kite: 8 in r5c7,r7c1 (connected by r7c9,r9c7) => r5c1<>8
  23. XYZ-Wing: 1/5/6 in r2c8,r3c49 => r3c7<>1
  24. Finned Swordfish: 5 r357 c139 fr7c2 => r9c3<>5
  25. AIC: 3 3- r6c4 =3= r9c4 =5= r9c9 =7= r9c3 -7- r8c2 =7= r6c2 =4= r4c2 =6= r2c2 -6- r1c1 =6= r1c7 =1= r9c7 -1- r9c6 -3 => r46c6,r9c4<>3
  26. Row 4 / Column 3 → 3 (Hidden Single)
  27. Row 9 / Column 6 → 3 (Hidden Single)
  28. Row 6 / Column 4 → 3 (Hidden Single)
  29. 2-String Kite: 6 in r2c2,r6c6 (connected by r4c2,r6c1) => r2c6<>6
  30. Locked Candidates Type 1 (Pointing): 6 in b2 => r5c4<>6
  31. AIC: 9 9- r1c3 -1- r1c7 =1= r9c7 =8= r5c7 -8- r5c4 -9- r4c6 =9= r4c1 -9 => r13c1,r5c3<>9
  32. W-Wing: 1/6 in r1c1,r3c4 connected by 6 in r2c24 => r3c13<>1
  33. 2-String Kite: 1 in r3c4,r9c7 (connected by r1c7,r3c9) => r9c4<>1
  34. Row 9 / Column 4 → 5 (Naked Single)
  35. Locked Candidates Type 1 (Pointing): 1 in b8 => r8c28<>1
  36. X-Wing: 5 r28 c28 => r7c2<>5
  37. Row 7 / Column 2 → 1 (Naked Single)
  38. Locked Candidates Type 1 (Pointing): 1 in b1 => r1c7<>1
  39. Row 9 / Column 7 → 1 (Hidden Single)
  40. Row 5 / Column 7 → 8 (Hidden Single)
  41. Row 5 / Column 4 → 9 (Naked Single)
  42. Row 8 / Column 4 → 8 (Hidden Single)
  43. Row 8 / Column 6 → 1 (Full House)
  44. Row 2 / Column 6 → 9 (Naked Single)
  45. Row 4 / Column 1 → 9 (Hidden Single)
  46. Row 4 / Column 6 → 8 (Hidden Single)
  47. Row 6 / Column 6 → 6 (Full House)
  48. Locked Candidates Type 1 (Pointing): 6 in b6 => r3c9<>6
  49. XY-Wing: 7/8/5 in r59c3,r7c1 => r5c1<>5
  50. Row 5 / Column 3 → 5 (Hidden Single)
  51. Bivalue Universal Grave + 1 => r3c1<>5, r3c1<>7
  52. Row 3 / Column 1 → 6 (Naked Single)
  53. Row 1 / Column 1 → 1 (Naked Single)
  54. Row 2 / Column 2 → 5 (Naked Single)
  55. Row 3 / Column 4 → 1 (Naked Single)
  56. Row 2 / Column 4 → 6 (Full House)
  57. Row 2 / Column 8 → 1 (Full House)
  58. Row 3 / Column 7 → 9 (Naked Single)
  59. Row 1 / Column 7 → 6 (Full House)
  60. Row 1 / Column 3 → 9 (Full House)
  61. Row 3 / Column 9 → 5 (Full House)
  62. Row 3 / Column 3 → 7 (Full House)
  63. Row 5 / Column 1 → 7 (Naked Single)
  64. Row 5 / Column 9 → 6 (Full House)
  65. Row 6 / Column 1 → 8 (Naked Single)
  66. Row 7 / Column 1 → 5 (Full House)
  67. Row 7 / Column 9 → 8 (Full House)
  68. Row 8 / Column 2 → 7 (Naked Single)
  69. Row 9 / Column 3 → 8 (Full House)
  70. Row 6 / Column 3 → 1 (Full House)
  71. Row 9 / Column 9 → 7 (Full House)
  72. Row 4 / Column 9 → 1 (Full House)
  73. Row 8 / Column 8 → 5 (Full House)
  74. Row 4 / Column 8 → 4 (Naked Single)
  75. Row 4 / Column 2 → 6 (Full House)
  76. Row 6 / Column 2 → 4 (Full House)
  77. Row 6 / Column 8 → 7 (Full House)
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