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

This Sudoku Puzzle has 75 steps and it is solved using Hidden Single, Locked Triple, Locked Candidates Type 1 (Pointing), Naked Single, Locked Candidates Type 2 (Claiming), undefined, AIC, Full House, Empty Rectangle, Hidden Rectangle, Finned Swordfish techniques.

Naked Single Explanation
Hidden Single Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 9 / Column 7 → 1 (Hidden Single)
  2. Row 9 / Column 5 → 3 (Hidden Single)
  3. Locked Triple: 2,4,6 in r5c123 => r5c45,r6c2<>2, r46c2,r5c4579<>4, r46c2,r5c457<>6
  4. Locked Candidates Type 1 (Pointing): 9 in b4 => r238c2<>9
  5. Row 2 / Column 5 → 9 (Hidden Single)
  6. Row 8 / Column 9 → 9 (Hidden Single)
  7. Row 4 / Column 2 → 9 (Hidden Single)
  8. Row 6 / Column 2 → 5 (Naked Single)
  9. Row 6 / Column 7 → 9 (Hidden Single)
  10. Row 4 / Column 6 → 5 (Hidden Single)
  11. Row 7 / Column 7 → 6 (Hidden Single)
  12. Row 8 / Column 4 → 6 (Hidden Single)
  13. Row 3 / Column 7 → 5 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 3 in b5 => r2c4<>3
  15. Locked Candidates Type 2 (Claiming): 4 in c7 => r13c9,r2c8<>4
  16. 2-String Kite: 8 in r3c5,r5c7 (connected by r1c7,r3c9) => r5c5<>8
  17. XYZ-Wing: 4/6/7 in r59c3,r8c2 => r7c3<>4
  18. AIC: 2 2- r3c2 -4- r8c2 -7- r8c6 =7= r6c6 -7- r5c5 -1- r1c5 =1= r1c2 =6= r5c2 =2= r5c1 -2 => r13c1,r5c2<>2
  19. Row 5 / Column 1 → 2 (Hidden Single)
  20. W-Wing: 4/6 in r1c1,r5c3 connected by 6 in r9c13 => r13c3<>4
  21. AIC: 1 1- r1c2 =1= r1c5 -1- r5c5 -7- r6c6 -4- r2c6 -3- r2c8 =3= r4c8 -3- r4c4 =3= r5c4 =1= r2c4 -1 => r1c5,r2c2<>1
  22. Row 1 / Column 2 → 1 (Hidden Single)
  23. Row 5 / Column 5 → 1 (Hidden Single)
  24. Row 2 / Column 4 → 1 (Hidden Single)
  25. Row 5 / Column 2 → 6 (Hidden Single)
  26. Row 5 / Column 3 → 4 (Full House)
  27. Row 6 / Column 4 → 2 (Hidden Single)
  28. Locked Candidates Type 1 (Pointing): 7 in b5 => r6c8<>7
  29. Empty Rectangle: 4 in b6 (r47c4) => r7c8<>4
  30. Hidden Rectangle: 4/6 in r4c58,r6c58 => r4c5<>4
  31. Finned Swordfish: 7 r159 c379 fr9c8 => r7c9<>7
  32. AIC: 3 3- r4c8 =3= r2c8 -3- r2c6 -4- r2c7 -7- r5c7 -8- r5c4 -3 => r4c4,r5c9<>3
  33. Row 5 / Column 4 → 3 (Hidden Single)
  34. Locked Candidates Type 1 (Pointing): 8 in b5 => r4c89<>8
  35. Locked Candidates Type 2 (Claiming): 8 in c8 => r7c9<>8
  36. AIC: 6 6- r4c5 -8- r4c4 =8= r7c4 -8- r8c6 =8= r1c6 =3= r2c6 -3- r2c8 =3= r4c8 =6= r6c8 -6 => r4c8,r6c5<>6
  37. Row 4 / Column 5 → 6 (Hidden Single)
  38. Row 6 / Column 8 → 6 (Hidden Single)
  39. Row 4 / Column 4 → 8 (Hidden Single)
  40. Row 7 / Column 4 → 4 (Full House)
  41. XY-Chain: 2 2- r3c2 -4- r3c1 -9- r7c1 -5- r7c9 -2 => r3c9<>2
  42. XY-Chain: 8 8- r3c9 -3- r3c3 -9- r7c3 -7- r7c5 -8 => r3c5<>8
  43. Row 3 / Column 9 → 8 (Hidden Single)
  44. Row 5 / Column 9 → 7 (Naked Single)
  45. Row 5 / Column 7 → 8 (Full House)
  46. Row 3 / Column 3 → 3 (Hidden Single)
  47. Row 3 / Column 1 → 9 (Hidden Single)
  48. Row 7 / Column 1 → 5 (Naked Single)
  49. Row 7 / Column 9 → 2 (Naked Single)
  50. Row 1 / Column 9 → 3 (Naked Single)
  51. Row 4 / Column 9 → 4 (Naked Single)
  52. Row 4 / Column 8 → 3 (Full House)
  53. Row 9 / Column 9 → 5 (Full House)
  54. Row 7 / Column 3 → 9 (Hidden Single)
  55. Row 1 / Column 5 → 2 (Hidden Single)
  56. Row 3 / Column 5 → 4 (Naked Single)
  57. Row 3 / Column 2 → 2 (Full House)
  58. Row 1 / Column 6 → 8 (Naked Single)
  59. Row 2 / Column 6 → 3 (Full House)
  60. Row 6 / Column 5 → 7 (Naked Single)
  61. Row 6 / Column 6 → 4 (Full House)
  62. Row 8 / Column 6 → 7 (Full House)
  63. Row 7 / Column 5 → 8 (Full House)
  64. Row 7 / Column 8 → 7 (Full House)
  65. Row 8 / Column 2 → 4 (Naked Single)
  66. Row 2 / Column 2 → 7 (Full House)
  67. Row 8 / Column 8 → 8 (Full House)
  68. Row 9 / Column 8 → 4 (Full House)
  69. Row 2 / Column 8 → 2 (Full House)
  70. Row 2 / Column 7 → 4 (Full House)
  71. Row 1 / Column 7 → 7 (Full House)
  72. Row 9 / Column 1 → 6 (Naked Single)
  73. Row 1 / Column 1 → 4 (Full House)
  74. Row 1 / Column 3 → 6 (Full House)
  75. Row 9 / Column 3 → 7 (Full House)
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