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

This Sudoku Puzzle has 72 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), undefined, Discontinuous Nice Loop, Naked Single, Empty Rectangle, AIC, Locked Candidates Type 2 (Claiming), Hidden Pair, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 8 → 9 (Hidden Single)
  2. Row 5 / Column 6 → 9 (Hidden Single)
  3. Row 4 / Column 7 → 1 (Hidden Single)
  4. Locked Candidates Type 1 (Pointing): 6 in b3 => r1c456<>6
  5. Locked Candidates Type 1 (Pointing): 4 in b5 => r129c5<>4
  6. Row 2 / Column 8 → 4 (Hidden Single)
  7. Row 1 / Column 8 → 1 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 7 in b5 => r12c5<>7
  9. X-Wing: 1 r28 c15 => r9c5<>1
  10. Discontinuous Nice Loop: 2/8 r1c4 =4= r1c6 =7= r3c6 =6= r3c4 =1= r9c4 =4= r1c4 => r1c4<>2, r1c4<>8
  11. Row 1 / Column 4 → 4 (Naked Single)
  12. Row 9 / Column 6 → 4 (Hidden Single)
  13. Empty Rectangle: 2 in b7 (r17c6) => r1c2<>2
  14. AIC: 6/8 6- r3c4 =6= r3c6 -6- r8c6 -5- r7c6 =5= r7c8 =8= r7c4 -8 => r7c4<>6, r3c4<>8
  15. Row 7 / Column 4 → 8 (Hidden Single)
  16. Locked Candidates Type 2 (Claiming): 8 in r3 => r1c23,r2c3<>8
  17. Locked Candidates Type 2 (Claiming): 8 in c8 => r56c7,r6c9<>8
  18. Hidden Pair: 3,8 in r5c28 => r5c2<>2, r5c28<>5, r5c2<>7, r5c8<>6
  19. Row 7 / Column 8 → 5 (Hidden Single)
  20. Row 8 / Column 6 → 5 (Hidden Single)
  21. 2-String Kite: 5 in r1c2,r5c7 (connected by r4c2,r5c1) => r1c7<>5
  22. W-Wing: 2/7 in r1c6,r2c3 connected by 7 in r12c7 => r1c3,r2c5<>2
  23. W-Wing: 2/6 in r5c4,r7c6 connected by 6 in r3c46 => r9c4<>2
  24. Row 5 / Column 4 → 2 (Hidden Single)
  25. Row 6 / Column 7 → 2 (Hidden Single)
  26. Locked Candidates Type 1 (Pointing): 6 in b5 => r89c5<>6
  27. Locked Candidates Type 1 (Pointing): 9 in b6 => r8c9<>9
  28. W-Wing: 1/6 in r8c1,r9c4 connected by 6 in r7c36 => r8c5,r9c2<>1
  29. Row 8 / Column 5 → 3 (Naked Single)
  30. Row 9 / Column 5 → 2 (Naked Single)
  31. Row 1 / Column 5 → 8 (Naked Single)
  32. Row 7 / Column 6 → 6 (Naked Single)
  33. Row 9 / Column 4 → 1 (Full House)
  34. Row 3 / Column 4 → 6 (Full House)
  35. Row 9 / Column 2 → 9 (Naked Single)
  36. Row 2 / Column 5 → 1 (Naked Single)
  37. Row 3 / Column 6 → 7 (Naked Single)
  38. Row 1 / Column 6 → 2 (Full House)
  39. Row 8 / Column 3 → 6 (Naked Single)
  40. Row 9 / Column 7 → 6 (Naked Single)
  41. Row 9 / Column 8 → 3 (Full House)
  42. Row 3 / Column 3 → 8 (Naked Single)
  43. Row 3 / Column 2 → 1 (Full House)
  44. Row 8 / Column 1 → 1 (Naked Single)
  45. Row 8 / Column 9 → 8 (Naked Single)
  46. Row 8 / Column 7 → 9 (Full House)
  47. Row 1 / Column 7 → 7 (Naked Single)
  48. Row 5 / Column 7 → 5 (Naked Single)
  49. Row 2 / Column 7 → 8 (Full House)
  50. Row 5 / Column 8 → 8 (Naked Single)
  51. Row 6 / Column 8 → 6 (Full House)
  52. Row 2 / Column 9 → 5 (Naked Single)
  53. Row 1 / Column 9 → 6 (Full House)
  54. Row 1 / Column 3 → 3 (Naked Single)
  55. Row 1 / Column 2 → 5 (Full House)
  56. Row 5 / Column 2 → 3 (Naked Single)
  57. Row 4 / Column 9 → 9 (Naked Single)
  58. Row 6 / Column 9 → 3 (Full House)
  59. Row 6 / Column 1 → 7 (Naked Single)
  60. Row 4 / Column 2 → 2 (Naked Single)
  61. Row 2 / Column 1 → 2 (Naked Single)
  62. Row 2 / Column 3 → 7 (Full House)
  63. Row 5 / Column 1 → 6 (Naked Single)
  64. Row 4 / Column 1 → 5 (Full House)
  65. Row 5 / Column 5 → 7 (Full House)
  66. Row 6 / Column 2 → 8 (Naked Single)
  67. Row 7 / Column 2 → 7 (Full House)
  68. Row 7 / Column 3 → 2 (Full House)
  69. Row 6 / Column 5 → 4 (Naked Single)
  70. Row 4 / Column 5 → 6 (Full House)
  71. Row 4 / Column 3 → 4 (Full House)
  72. Row 6 / Column 3 → 9 (Full House)
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