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

This Sudoku Puzzle has 77 steps and it is solved using Locked Candidates Type 1 (Pointing), Hidden Pair, AIC, Hidden Single, undefined, Locked Candidates Type 2 (Claiming), Discontinuous Nice Loop, Naked Triple, Naked Single, Naked Pair, Finned Swordfish, Swordfish, Full House 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. Locked Candidates Type 1 (Pointing): 3 in b1 => r79c2<>3
  2. Hidden Pair: 1,7 in r4c3,r5c2 => r4c3<>4, r4c3<>9, r5c2<>6
  3. Hidden Pair: 7,9 in r7c8,r9c9 => r7c8,r9c9<>3, r7c8<>8, r9c9<>2, r9c9<>4
  4. Hidden Pair: 1,7 in r49c3 => r9c3<>4, r9c3<>5
  5. AIC: 1 1- r3c5 =1= r9c5 =2= r9c7 =4= r3c7 -4- r3c4 =4= r4c4 =7= r4c3 =1= r9c3 -1- r7c2 =1= r7c6 -1 => r2c6,r9c5<>1
  6. Row 3 / Column 5 → 1 (Hidden Single)
  7. XY-Chain: 3 3- r3c8 -2- r2c7 -6- r5c7 -8- r7c7 -3 => r3c7,r8c8<>3
  8. Locked Candidates Type 2 (Claiming): 3 in c7 => r8c9<>3
  9. Discontinuous Nice Loop: 9 r2c1 -9- r5c1 -6- r6c2 -2- r3c2 =2= r2c1 => r2c1<>9
  10. Locked Candidates Type 1 (Pointing): 9 in b1 => r6c3<>9
  11. Discontinuous Nice Loop: 3 r4c4 -3- r8c4 =3= r8c1 -3- r9c1 -4- r9c7 =4= r3c7 -4- r3c4 =4= r4c4 => r4c4<>3
  12. Locked Candidates Type 1 (Pointing): 3 in b5 => r79c6<>3
  13. Naked Triple: 1,7,9 in r9c369 => r9c2<>1, r9c2<>7, r9c5<>9
  14. Row 9 / Column 2 → 5 (Naked Single)
  15. Row 9 / Column 5 → 2 (Naked Single)
  16. Row 8 / Column 5 → 5 (Naked Single)
  17. Row 5 / Column 4 → 5 (Hidden Single)
  18. Locked Candidates Type 2 (Claiming): 9 in c5 => r4c46,r6c6<>9
  19. Locked Candidates Type 2 (Claiming): 2 in c7 => r2c89,r3c8<>2
  20. Row 3 / Column 8 → 3 (Naked Single)
  21. Row 1 / Column 2 → 3 (Hidden Single)
  22. Naked Pair: 2,6 in r36c2 => r7c2<>6
  23. Finned Swordfish: 7 r157 c258 fr1c9 => r2c8<>7
  24. Swordfish: 7 r249 c349 => r1c9<>7
  25. Naked Triple: 2,4,6 in r1c9,r23c7 => r2c9<>6
  26. W-Wing: 1/7 in r2c9,r4c3 connected by 7 in r9c39 => r4c9<>1
  27. XY-Chain: 9 9- r6c5 -8- r1c5 -7- r1c8 -5- r2c8 -1- r2c9 -7- r9c9 -9 => r6c9<>9
  28. Discontinuous Nice Loop: 6/8/9 r2c3 =5= r2c8 =1= r2c9 =7= r2c4 -7- r4c4 -4- r3c4 =4= r3c7 -4- r9c7 -3- r7c7 -8- r5c7 =8= r5c5 =7= r1c5 -7- r1c8 -5- r1c3 =5= r2c3 => r2c3<>6, r2c3<>8, r2c3<>9
  29. Row 2 / Column 3 → 5 (Naked Single)
  30. Row 2 / Column 8 → 1 (Naked Single)
  31. Row 2 / Column 9 → 7 (Naked Single)
  32. Row 1 / Column 8 → 5 (Naked Single)
  33. Row 9 / Column 9 → 9 (Naked Single)
  34. Row 7 / Column 8 → 7 (Naked Single)
  35. Row 9 / Column 6 → 1 (Naked Single)
  36. Row 7 / Column 2 → 1 (Naked Single)
  37. Row 9 / Column 3 → 7 (Naked Single)
  38. Row 5 / Column 2 → 7 (Naked Single)
  39. Row 4 / Column 3 → 1 (Naked Single)
  40. Row 3 / Column 3 → 9 (Hidden Single)
  41. Row 5 / Column 9 → 1 (Hidden Single)
  42. Row 1 / Column 5 → 7 (Hidden Single)
  43. Row 4 / Column 4 → 7 (Hidden Single)
  44. Row 3 / Column 4 → 4 (Hidden Single)
  45. Row 1 / Column 9 → 4 (Hidden Single)
  46. Row 8 / Column 9 → 2 (Naked Single)
  47. Row 4 / Column 9 → 3 (Naked Single)
  48. Row 6 / Column 9 → 6 (Full House)
  49. Row 8 / Column 8 → 8 (Naked Single)
  50. Row 4 / Column 6 → 4 (Naked Single)
  51. Row 5 / Column 7 → 8 (Naked Single)
  52. Row 6 / Column 2 → 2 (Naked Single)
  53. Row 3 / Column 2 → 6 (Full House)
  54. Row 3 / Column 7 → 2 (Full House)
  55. Row 2 / Column 7 → 6 (Full House)
  56. Row 6 / Column 3 → 4 (Naked Single)
  57. Row 7 / Column 7 → 3 (Naked Single)
  58. Row 9 / Column 7 → 4 (Full House)
  59. Row 9 / Column 1 → 3 (Full House)
  60. Row 5 / Column 5 → 9 (Naked Single)
  61. Row 5 / Column 1 → 6 (Full House)
  62. Row 4 / Column 1 → 9 (Full House)
  63. Row 6 / Column 5 → 8 (Full House)
  64. Row 4 / Column 8 → 2 (Full House)
  65. Row 6 / Column 8 → 9 (Full House)
  66. Row 6 / Column 6 → 3 (Full House)
  67. Row 1 / Column 3 → 8 (Naked Single)
  68. Row 8 / Column 3 → 6 (Full House)
  69. Row 1 / Column 6 → 6 (Full House)
  70. Row 2 / Column 1 → 2 (Full House)
  71. Row 2 / Column 4 → 9 (Naked Single)
  72. Row 2 / Column 6 → 8 (Full House)
  73. Row 7 / Column 6 → 9 (Full House)
  74. Row 7 / Column 1 → 8 (Naked Single)
  75. Row 8 / Column 1 → 4 (Full House)
  76. Row 8 / Column 4 → 3 (Full House)
  77. Row 7 / Column 4 → 6 (Full House)
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