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

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

Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 1 → 3 (Hidden Single)
  2. Row 3 / Column 5 → 1 (Hidden Single)
  3. Row 7 / Column 3 → 3 (Hidden Single)
  4. Row 9 / Column 6 → 3 (Hidden Single)
  5. Row 4 / Column 5 → 3 (Hidden Single)
  6. Row 5 / Column 7 → 3 (Hidden Single)
  7. Row 3 / Column 9 → 3 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 6 in b1 => r789c2<>6
  9. Locked Candidates Type 1 (Pointing): 7 in b2 => r1c89<>7
  10. Locked Candidates Type 1 (Pointing): 7 in b5 => r5c8<>7
  11. Locked Candidates Type 1 (Pointing): 4 in b8 => r13c4<>4
  12. 2-String Kite: 8 in r3c7,r8c5 (connected by r2c5,r3c4) => r8c7<>8
  13. Locked Candidates Type 1 (Pointing): 8 in b9 => r2c9<>8
  14. Empty Rectangle: 6 in b7 (r68c5) => r6c1<>6
  15. AIC: 6 6- r6c5 =6= r8c5 =8= r2c5 -8- r2c7 =8= r3c7 =6= r8c7 -6- r9c8 =6= r9c4 -6 => r4c4,r8c5<>6
  16. Row 6 / Column 5 → 6 (Hidden Single)
  17. Naked Triple: 2,5,9 in r4c467 => r4c19<>2, r4c139<>5, r4c39<>9
  18. Row 6 / Column 9 → 9 (Hidden Single)
  19. Locked Candidates Type 1 (Pointing): 9 in b4 => r5c46<>9
  20. Naked Pair: 4,5 in r26c3 => r48c3<>4, r58c3<>5
  21. 2-String Kite: 4 in r2c3,r4c9 (connected by r4c1,r6c3) => r2c9<>4
  22. Locked Candidates Type 2 (Claiming): 4 in r2 => r13c2<>4
  23. Locked Candidates Type 2 (Claiming): 4 in c2 => r8c1<>4
  24. Continuous Nice Loop: 2/5/6/7 7= r6c8 =4= r4c9 -4- r4c1 -6- r7c1 -7- r7c8 =7= r6c8 =4 => r6c8<>2, r6c8<>5, r8c1<>6, r7c9<>7
  25. XY-Chain: 5 5- r6c3 -4- r4c1 -6- r7c1 -7- r8c1 -5 => r6c1<>5
  26. Discontinuous Nice Loop: 2/5 r2c9 =7= r2c7 =8= r3c7 =6= r8c7 -6- r8c3 =6= r7c1 =7= r7c8 -7- r8c9 =7= r2c9 => r2c9<>2, r2c9<>5
  27. Row 2 / Column 9 → 7 (Naked Single)
  28. Discontinuous Nice Loop: 2/5/6 r8c7 =7= r6c7 -7- r6c8 -4- r4c9 -1- r7c9 =1= r7c8 =7= r8c7 => r8c7<>2, r8c7<>5, r8c7<>6
  29. Row 8 / Column 7 → 7 (Naked Single)
  30. Row 8 / Column 1 → 5 (Naked Single)
  31. Row 3 / Column 7 → 6 (Hidden Single)
  32. Row 6 / Column 8 → 7 (Hidden Single)
  33. Row 7 / Column 1 → 7 (Hidden Single)
  34. Row 1 / Column 2 → 6 (Hidden Single)
  35. Row 3 / Column 4 → 8 (Hidden Single)
  36. Row 2 / Column 5 → 2 (Naked Single)
  37. Row 1 / Column 5 → 9 (Naked Single)
  38. Row 8 / Column 5 → 8 (Full House)
  39. Row 2 / Column 1 → 4 (Naked Single)
  40. Row 8 / Column 9 → 2 (Naked Single)
  41. Row 2 / Column 3 → 5 (Naked Single)
  42. Row 2 / Column 7 → 8 (Full House)
  43. Row 3 / Column 2 → 2 (Full House)
  44. Row 4 / Column 1 → 6 (Naked Single)
  45. Row 6 / Column 1 → 2 (Full House)
  46. Row 6 / Column 3 → 4 (Naked Single)
  47. Row 6 / Column 7 → 5 (Full House)
  48. Row 4 / Column 7 → 2 (Full House)
  49. Row 4 / Column 3 → 1 (Naked Single)
  50. Row 5 / Column 8 → 1 (Naked Single)
  51. Row 4 / Column 9 → 4 (Full House)
  52. Row 5 / Column 3 → 9 (Naked Single)
  53. Row 5 / Column 2 → 5 (Full House)
  54. Row 8 / Column 3 → 6 (Full House)
  55. Row 7 / Column 8 → 6 (Naked Single)
  56. Row 1 / Column 9 → 5 (Naked Single)
  57. Row 9 / Column 8 → 5 (Naked Single)
  58. Row 1 / Column 4 → 7 (Naked Single)
  59. Row 3 / Column 8 → 4 (Naked Single)
  60. Row 1 / Column 8 → 2 (Full House)
  61. Row 1 / Column 6 → 4 (Full House)
  62. Row 3 / Column 6 → 5 (Full House)
  63. Row 9 / Column 9 → 8 (Naked Single)
  64. Row 7 / Column 9 → 1 (Full House)
  65. Row 5 / Column 4 → 2 (Naked Single)
  66. Row 5 / Column 6 → 7 (Full House)
  67. Row 4 / Column 6 → 9 (Naked Single)
  68. Row 4 / Column 4 → 5 (Full House)
  69. Row 7 / Column 6 → 2 (Full House)
  70. Row 9 / Column 2 → 4 (Naked Single)
  71. Row 9 / Column 4 → 6 (Full House)
  72. Row 7 / Column 4 → 9 (Naked Single)
  73. Row 7 / Column 2 → 8 (Full House)
  74. Row 8 / Column 2 → 9 (Full House)
  75. Row 8 / Column 4 → 4 (Full House)
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