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

This Sudoku Puzzle has 70 steps and it is solved using Naked Single, Hidden Single, Full House, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Rectangle, Discontinuous Nice Loop, undefined, AIC techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 5 → 4 (Naked Single)
  2. Row 5 / Column 2 → 7 (Naked Single)
  3. Row 4 / Column 7 → 5 (Hidden Single)
  4. Row 5 / Column 3 → 6 (Hidden Single)
  5. Row 3 / Column 7 → 6 (Hidden Single)
  6. Row 9 / Column 5 → 6 (Hidden Single)
  7. Row 8 / Column 3 → 5 (Hidden Single)
  8. Row 3 / Column 1 → 5 (Hidden Single)
  9. Row 2 / Column 7 → 2 (Hidden Single)
  10. Row 8 / Column 6 → 2 (Hidden Single)
  11. Row 4 / Column 9 → 7 (Hidden Single)
  12. Row 6 / Column 3 → 8 (Hidden Single)
  13. Row 2 / Column 5 → 5 (Hidden Single)
  14. Row 4 / Column 5 → 3 (Hidden Single)
  15. Row 6 / Column 5 → 2 (Full House)
  16. Row 6 / Column 9 → 4 (Hidden Single)
  17. Row 6 / Column 1 → 1 (Hidden Single)
  18. Locked Candidates Type 1 (Pointing): 8 in b8 => r7c9<>8
  19. Locked Candidates Type 2 (Claiming): 1 in c9 => r1c7,r2c8<>1
  20. Hidden Rectangle: 2/9 in r4c13,r7c13 => r7c1<>9
  21. Discontinuous Nice Loop: 3/9 r9c9 =8= r9c7 =7= r8c7 -7- r8c5 -9- r3c5 -1- r3c9 =1= r2c9 =8= r9c9 => r9c9<>3, r9c9<>9
  22. Row 9 / Column 9 → 8 (Naked Single)
  23. Discontinuous Nice Loop: 3 r2c4 -3- r2c2 -9- r1c1 -7- r2c3 =7= r2c4 => r2c4<>3
  24. Discontinuous Nice Loop: 3 r2c6 -3- r2c2 =3= r8c2 =4= r8c4 -4- r2c4 =4= r2c6 => r2c6<>3
  25. Discontinuous Nice Loop: 3 r2c8 -3- r2c2 -9- r1c1 -7- r2c3 =7= r2c4 =8= r2c8 => r2c8<>3
  26. W-Wing: 9/3 in r6c7,r7c9 connected by 3 in r68c8 => r89c7<>9
  27. Discontinuous Nice Loop: 7 r9c1 -7- r9c7 =7= r8c7 =1= r8c8 -1- r5c8 -8- r2c8 -9- r2c6 -4- r9c6 =4= r9c1 => r9c1<>7
  28. 2-String Kite: 7 in r2c4,r7c1 (connected by r1c1,r2c3) => r7c4<>7
  29. AIC: 4 4- r4c2 =4= r8c2 -4- r8c4 =4= r2c4 =7= r2c3 -7- r1c1 -9- r9c1 -4 => r4c1,r8c2<>4
  30. Row 4 / Column 2 → 4 (Hidden Single)
  31. Row 9 / Column 1 → 4 (Hidden Single)
  32. Row 8 / Column 4 → 4 (Hidden Single)
  33. Row 2 / Column 6 → 4 (Hidden Single)
  34. Locked Candidates Type 1 (Pointing): 7 in b8 => r1c5<>7
  35. 2-String Kite: 3 in r3c9,r7c4 (connected by r1c4,r3c6) => r7c9<>3
  36. Row 7 / Column 9 → 9 (Naked Single)
  37. Locked Candidates Type 2 (Claiming): 9 in r3 => r1c5<>9
  38. Locked Candidates Type 2 (Claiming): 3 in c9 => r1c7<>3
  39. X-Wing: 3 r17 c34 => r29c3<>3
  40. W-Wing: 7/9 in r1c1,r9c3 connected by 9 in r4c13 => r12c3,r7c1<>7
  41. Row 7 / Column 1 → 2 (Naked Single)
  42. Row 4 / Column 1 → 9 (Naked Single)
  43. Row 1 / Column 1 → 7 (Full House)
  44. Row 4 / Column 3 → 2 (Full House)
  45. Row 2 / Column 4 → 7 (Hidden Single)
  46. Row 2 / Column 8 → 8 (Hidden Single)
  47. Row 1 / Column 7 → 9 (Naked Single)
  48. Row 5 / Column 8 → 1 (Naked Single)
  49. Row 5 / Column 7 → 8 (Full House)
  50. Row 6 / Column 7 → 3 (Naked Single)
  51. Row 6 / Column 8 → 9 (Full House)
  52. Row 8 / Column 8 → 3 (Full House)
  53. Row 9 / Column 7 → 7 (Naked Single)
  54. Row 8 / Column 7 → 1 (Full House)
  55. Row 8 / Column 2 → 9 (Naked Single)
  56. Row 2 / Column 2 → 3 (Full House)
  57. Row 8 / Column 5 → 7 (Full House)
  58. Row 9 / Column 3 → 9 (Naked Single)
  59. Row 1 / Column 3 → 1 (Full House)
  60. Row 2 / Column 9 → 1 (Full House)
  61. Row 2 / Column 3 → 1 (Full House)
  62. Row 3 / Column 9 → 3 (Full House)
  63. Row 7 / Column 5 → 8 (Naked Single)
  64. Row 9 / Column 6 → 3 (Full House)
  65. Row 3 / Column 6 → 9 (Full House)
  66. Row 7 / Column 4 → 3 (Full House)
  67. Row 1 / Column 5 → 8 (Full House)
  68. Row 3 / Column 5 → 1 (Full House)
  69. Row 1 / Column 4 → 8 (Full House)
  70. Row 7 / Column 3 → 7 (Naked Single)
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