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

This Sudoku Puzzle has 77 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Single, Full House, undefined, Discontinuous Nice Loop, Grouped Discontinuous Nice Loop, AIC, Naked Pair, Locked Candidates Type 2 (Claiming) techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 3 → 9 (Hidden Single)
  2. Row 6 / Column 1 → 9 (Hidden Single)
  3. Row 5 / Column 4 → 2 (Hidden Single)
  4. Row 7 / Column 2 → 4 (Hidden Single)
  5. Row 5 / Column 6 → 9 (Hidden Single)
  6. Row 3 / Column 3 → 2 (Hidden Single)
  7. Row 7 / Column 5 → 9 (Hidden Single)
  8. Row 3 / Column 6 → 4 (Hidden Single)
  9. Row 8 / Column 4 → 4 (Hidden Single)
  10. Row 9 / Column 7 → 9 (Hidden Single)
  11. Locked Candidates Type 1 (Pointing): 8 in b1 => r2c5789<>8
  12. Locked Candidates Type 1 (Pointing): 1 in b5 => r12c5<>1
  13. Locked Candidates Type 1 (Pointing): 8 in b5 => r4c79<>8
  14. Locked Candidates Type 1 (Pointing): 5 in b8 => r1c6<>5
  15. Row 1 / Column 6 → 8 (Naked Single)
  16. Row 4 / Column 6 → 6 (Naked Single)
  17. Row 4 / Column 9 → 3 (Naked Single)
  18. Row 6 / Column 5 → 1 (Naked Single)
  19. Row 4 / Column 5 → 8 (Full House)
  20. 2-String Kite: 1 in r2c1,r5c8 (connected by r4c1,r5c2) => r2c8<>1
  21. Finned X-Wing: 6 c15 r28 fr9c1 => r8c3<>6
  22. Discontinuous Nice Loop: 7 r2c3 -7- r4c3 =7= r4c1 =1= r2c1 =8= r2c3 => r2c3<>7
  23. Discontinuous Nice Loop: 6 r7c3 -6- r5c3 -3- r5c2 =3= r9c2 =5= r7c3 => r7c3<>6
  24. Discontinuous Nice Loop: 7 r7c3 -7- r4c3 =7= r4c1 =1= r2c1 =8= r2c3 =5= r7c3 => r7c3<>7
  25. Discontinuous Nice Loop: 8 r7c8 -8- r3c8 -1- r3c4 -6- r7c4 =6= r7c8 => r7c8<>8
  26. Grouped Discontinuous Nice Loop: 1 r1c2 -1- r1c4 =1= r3c4 =6= r3c2 =5= r3c7 -5- r2c9 -7- r1c89 =7= r1c2 => r1c2<>1
  27. W-Wing: 7/5 in r1c2,r2c9 connected by 5 in r3c27 => r1c89,r2c12<>7
  28. Row 1 / Column 2 → 7 (Hidden Single)
  29. AIC: 5/8 8- r2c3 =8= r2c1 =1= r4c1 -1- r4c7 =1= r5c8 -1- r1c8 =1= r1c4 -1- r3c4 -6- r7c4 =6= r7c8 =7= r7c6 =5= r7c3 -5 => r2c3<>5, r7c3<>8
  30. Row 7 / Column 3 → 5 (Hidden Single)
  31. Row 7 / Column 6 → 7 (Naked Single)
  32. Row 9 / Column 6 → 5 (Full House)
  33. Discontinuous Nice Loop: 3/6/8 r9c8 =7= r9c1 -7- r4c1 -1- r4c7 -4- r2c7 =4= r2c8 =7= r9c8 => r9c8<>3, r9c8<>6, r9c8<>8
  34. Row 9 / Column 8 → 7 (Naked Single)
  35. Row 2 / Column 9 → 7 (Hidden Single)
  36. Discontinuous Nice Loop: 3/8 r8c7 =2= r8c9 -2- r1c9 -5- r6c9 =5= r6c7 =2= r8c7 => r8c7<>3, r8c7<>8
  37. Row 8 / Column 7 → 2 (Naked Single)
  38. Locked Candidates Type 1 (Pointing): 3 in b9 => r7c4<>3
  39. Naked Pair: 6,8 in r58c9 => r6c9<>6
  40. W-Wing: 8/6 in r2c3,r8c9 connected by 6 in r28c5 => r8c3<>8
  41. Row 2 / Column 3 → 8 (Hidden Single)
  42. Locked Candidates Type 2 (Claiming): 6 in c3 => r5c2<>6
  43. W-Wing: 3/6 in r5c3,r8c5 connected by 6 in r58c9 => r8c3<>3
  44. Row 8 / Column 3 → 7 (Naked Single)
  45. Row 4 / Column 3 → 4 (Naked Single)
  46. Row 4 / Column 7 → 1 (Naked Single)
  47. Row 4 / Column 1 → 7 (Full House)
  48. Row 6 / Column 3 → 6 (Naked Single)
  49. Row 5 / Column 3 → 3 (Full House)
  50. Row 5 / Column 2 → 1 (Full House)
  51. Row 8 / Column 5 → 3 (Hidden Single)
  52. Row 1 / Column 5 → 5 (Naked Single)
  53. Row 2 / Column 5 → 6 (Full House)
  54. Row 1 / Column 9 → 2 (Naked Single)
  55. Row 2 / Column 1 → 1 (Naked Single)
  56. Row 2 / Column 2 → 5 (Naked Single)
  57. Row 3 / Column 2 → 6 (Full House)
  58. Row 9 / Column 2 → 3 (Full House)
  59. Row 3 / Column 4 → 1 (Naked Single)
  60. Row 1 / Column 4 → 3 (Full House)
  61. Row 1 / Column 8 → 1 (Full House)
  62. Row 6 / Column 9 → 5 (Naked Single)
  63. Row 3 / Column 8 → 8 (Naked Single)
  64. Row 3 / Column 7 → 5 (Full House)
  65. Row 6 / Column 7 → 4 (Naked Single)
  66. Row 6 / Column 8 → 2 (Full House)
  67. Row 5 / Column 8 → 6 (Naked Single)
  68. Row 5 / Column 9 → 8 (Full House)
  69. Row 8 / Column 9 → 6 (Full House)
  70. Row 8 / Column 1 → 8 (Full House)
  71. Row 9 / Column 1 → 6 (Full House)
  72. Row 9 / Column 4 → 8 (Full House)
  73. Row 7 / Column 4 → 6 (Full House)
  74. Row 2 / Column 7 → 3 (Naked Single)
  75. Row 2 / Column 8 → 4 (Full House)
  76. Row 7 / Column 8 → 3 (Full House)
  77. Row 7 / Column 7 → 8 (Full House)
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