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

This Sudoku Puzzle has 79 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, Swordfish, undefined, Discontinuous Nice Loop, Locked Candidates Type 2 (Claiming), AIC, Locked Pair, Empty Rectangle, Naked Single, Naked Pair, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 1 → 3 (Hidden Single)
  2. Row 8 / Column 2 → 3 (Hidden Single)
  3. Row 8 / Column 8 → 2 (Hidden Single)
  4. Row 4 / Column 9 → 4 (Hidden Single)
  5. Row 2 / Column 4 → 2 (Hidden Single)
  6. Row 1 / Column 9 → 2 (Hidden Single)
  7. Row 4 / Column 5 → 2 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 7 in b7 => r12c3<>7
  9. Naked Triple: 1,5,9 in r489c4 => r167c4<>5, r67c4<>9, r7c4<>1
  10. Swordfish: 7 c359 r579 => r579c7,r7c68<>7
  11. XYZ-Wing: 5/7/9 in r4c46,r8c6 => r6c6<>5
  12. Discontinuous Nice Loop: 1 r1c2 -1- r4c2 =1= r4c8 =7= r2c8 -7- r2c2 =7= r1c2 => r1c2<>1
  13. Locked Candidates Type 2 (Claiming): 1 in c2 => r6c3<>1
  14. AIC: 6 6- r1c5 -5- r1c2 -7- r1c7 =7= r2c8 =6= r3c8 -6 => r3c56<>6
  15. Discontinuous Nice Loop: 9 r3c3 -9- r2c2 -7- r2c8 -6- r3c8 =6= r3c3 => r3c3<>9
  16. Locked Candidates Type 1 (Pointing): 9 in b1 => r2c6<>9
  17. Discontinuous Nice Loop: 9 r4c2 -9- r2c2 -7- r2c8 =7= r4c8 =1= r4c2 => r4c2<>9
  18. Locked Candidates Type 2 (Claiming): 9 in r4 => r5c5,r6c6<>9
  19. Locked Pair: 6,8 in r6c46 => r5c5,r6c3<>6
  20. Naked Triple: 1,5,9 in r46c2,r6c3 => r5c13<>5, r5c3<>9
  21. Locked Candidates Type 1 (Pointing): 9 in b4 => r6c9<>9
  22. Empty Rectangle: 5 in b9 (r5c57) => r7c5<>5
  23. Sashimi X-Wing: 5 r58 c57 fr8c4 fr8c6 => r9c5<>5
  24. AIC: 6 6- r1c5 -5- r5c5 -7- r5c9 =7= r4c8 -7- r2c8 -6- r3c8 =6= r3c3 -6 => r1c13<>6
  25. Locked Candidates Type 2 (Claiming): 6 in r1 => r2c6<>6
  26. Discontinuous Nice Loop: 5 r1c5 -5- r1c2 -7- r1c7 =7= r8c7 -7- r8c6 =7= r4c6 -7- r5c5 -5- r1c5 => r1c5<>5
  27. Row 1 / Column 5 → 6 (Naked Single)
  28. Locked Candidates Type 1 (Pointing): 5 in b2 => r3c3<>5
  29. Naked Pair: 4,8 in r1c4,r2c6 => r3c6<>4, r3c6<>8
  30. Row 3 / Column 7 → 4 (Hidden Single)
  31. Naked Triple: 5,7,9 in r348c6 => r7c6<>5, r7c6<>9
  32. W-Wing: 5/9 in r3c5,r4c4 connected by 9 in r34c6 => r5c5<>5
  33. Row 5 / Column 5 → 7 (Naked Single)
  34. Row 5 / Column 9 → 9 (Naked Single)
  35. Row 5 / Column 7 → 5 (Naked Single)
  36. Row 3 / Column 5 → 5 (Hidden Single)
  37. Row 3 / Column 6 → 9 (Naked Single)
  38. Row 4 / Column 6 → 5 (Naked Single)
  39. Row 4 / Column 2 → 1 (Naked Single)
  40. Row 4 / Column 4 → 9 (Naked Single)
  41. Row 4 / Column 8 → 7 (Full House)
  42. Row 8 / Column 6 → 7 (Naked Single)
  43. Row 2 / Column 8 → 6 (Naked Single)
  44. Row 8 / Column 7 → 1 (Naked Single)
  45. Row 8 / Column 4 → 5 (Full House)
  46. Row 2 / Column 1 → 4 (Naked Single)
  47. Row 3 / Column 8 → 1 (Naked Single)
  48. Row 7 / Column 7 → 9 (Naked Single)
  49. Row 9 / Column 4 → 1 (Naked Single)
  50. Row 2 / Column 6 → 8 (Naked Single)
  51. Row 1 / Column 4 → 4 (Full House)
  52. Row 3 / Column 9 → 8 (Naked Single)
  53. Row 1 / Column 7 → 7 (Full House)
  54. Row 9 / Column 7 → 8 (Full House)
  55. Row 3 / Column 3 → 6 (Full House)
  56. Row 6 / Column 8 → 3 (Naked Single)
  57. Row 6 / Column 9 → 1 (Full House)
  58. Row 7 / Column 8 → 5 (Full House)
  59. Row 7 / Column 5 → 3 (Naked Single)
  60. Row 9 / Column 5 → 9 (Full House)
  61. Row 9 / Column 1 → 5 (Naked Single)
  62. Row 2 / Column 3 → 9 (Naked Single)
  63. Row 2 / Column 2 → 7 (Full House)
  64. Row 6 / Column 6 → 6 (Naked Single)
  65. Row 6 / Column 4 → 8 (Full House)
  66. Row 7 / Column 4 → 6 (Full House)
  67. Row 7 / Column 6 → 4 (Full House)
  68. Row 1 / Column 2 → 5 (Naked Single)
  69. Row 6 / Column 2 → 9 (Full House)
  70. Row 6 / Column 3 → 5 (Full House)
  71. Row 5 / Column 3 → 2 (Naked Single)
  72. Row 5 / Column 1 → 6 (Full House)
  73. Row 7 / Column 9 → 7 (Naked Single)
  74. Row 9 / Column 9 → 3 (Full House)
  75. Row 9 / Column 3 → 7 (Full House)
  76. Row 1 / Column 1 → 1 (Naked Single)
  77. Row 1 / Column 3 → 8 (Full House)
  78. Row 7 / Column 3 → 1 (Full House)
  79. Row 7 / Column 1 → 2 (Full House)
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