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This Sudoku Puzzle has 81 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Naked Triple, Naked Single, undefined, Turbot Fish, Empty Rectangle, Sashimi Swordfish, Discontinuous Nice Loop, Naked Pair, Grouped Discontinuous Nice Loop, Sue de Coq, AIC, Finned Swordfish, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 3 / Column 2 → 9 (Hidden Single)
  2. Row 4 / Column 2 → 2 (Hidden Single)
  3. Row 2 / Column 8 → 1 (Hidden Single)
  4. Row 3 / Column 3 → 3 (Hidden Single)
  5. Row 7 / Column 2 → 1 (Hidden Single)
  6. Row 5 / Column 2 → 3 (Hidden Single)
  7. Row 3 / Column 4 → 5 (Hidden Single)
  8. Row 2 / Column 2 → 5 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 7 in b1 => r2c457<>7
  10. Locked Candidates Type 1 (Pointing): 7 in b3 => r79c8<>7
  11. Locked Candidates Type 1 (Pointing): 7 in b7 => r8c4567<>7
  12. Row 7 / Column 7 → 7 (Hidden Single)
  13. Naked Triple: 6,8,9 in r5c46,r6c5 => r4c56,r6c4<>6, r4c5,r6c4<>9, r6c4<>8
  14. Row 4 / Column 5 → 7 (Naked Single)
  15. Naked Triple: 4,6,9 in r9c258 => r9c46<>6, r9c4<>9, r9c6<>4
  16. 2-String Kite: 9 in r5c4,r9c8 (connected by r8c4,r9c5) => r5c8<>9
  17. Turbot Fish: 4 r2c5 =4= r1c6 -4- r1c2 =4= r9c2 => r9c5<>4
  18. Empty Rectangle: 4 in b7 (r1c26) => r8c6<>4
  19. Sashimi Swordfish: 6 r139 c258 fr1c4 fr1c6 fr3c6 => r2c5<>6
  20. Discontinuous Nice Loop: 4/6/9 r6c1 =8= r6c5 -8- r2c5 -4- r1c6 =4= r7c6 =8= r5c6 -8- r5c1 =8= r6c1 => r6c1<>4, r6c1<>6, r6c1<>9
  21. Row 6 / Column 1 → 8 (Naked Single)
  22. Naked Pair: 6,9 in r69c5 => r78c5<>6, r8c5<>9
  23. X-Wing: 9 c58 r69 => r6c9<>9
  24. W-Wing: 6/9 in r4c1,r6c5 connected by 9 in r5c14 => r6c3<>6
  25. Discontinuous Nice Loop: 8 r5c4 -8- r5c6 -6- r3c6 -7- r9c6 -3- r9c4 =3= r6c4 =1= r8c4 =9= r5c4 => r5c4<>8
  26. Row 5 / Column 6 → 8 (Hidden Single)
  27. Discontinuous Nice Loop: 4 r6c8 -4- r6c3 -1- r6c4 =1= r8c4 =9= r8c9 -9- r4c9 =9= r6c8 => r6c8<>4
  28. Grouped Discontinuous Nice Loop: 2 r8c4 -2- r12c4 =2= r1c6 =4= r1c2 -4- r9c2 =4= r9c8 -4- r5c8 =4= r6c9 -4- r6c3 -1- r6c4 =1= r8c4 => r8c4<>2
  29. Grouped Discontinuous Nice Loop: 6 r8c4 -6- r8c13 =6= r9c2 =4= r9c8 -4- r5c8 =4= r6c9 -4- r6c3 -1- r6c4 =1= r8c4 => r8c4<>6
  30. Grouped Discontinuous Nice Loop: 6 r8c9 -6- r7c89 =6= r7c46 -6- r9c5 -9- r9c8 =9= r8c9 => r8c9<>6
  31. Almost Locked Set XZ-Rule: A=r13679c8 {245679}, B=r7c456,r8c46,r9c456 {123456789}, X=5, Z=4 => r7c9<>4
  32. Sue de Coq: r7c456 - {24568} (r7c9 - {26}, r8c5 - {45}) => r7c8<>2, r7c8<>6
  33. AIC: 6 6- r1c2 -4- r9c2 =4= r9c8 =9= r6c8 =2= r1c8 =7= r3c8 =6= r3c6 -6 => r1c46<>6
  34. Finned Swordfish: 6 r139 c268 fr9c5 => r78c6<>6
  35. Row 3 / Column 6 → 6 (Hidden Single)
  36. Row 3 / Column 8 → 7 (Full House)
  37. 2-String Kite: 6 in r6c5,r7c9 (connected by r7c4,r9c5) => r6c9<>6
  38. Finned Swordfish: 6 r169 c258 fr6c7 => r5c8<>6
  39. Naked Pair: 4,5 in r57c8 => r9c8<>4
  40. Row 9 / Column 2 → 4 (Hidden Single)
  41. Row 1 / Column 2 → 6 (Full House)
  42. Row 1 / Column 8 → 2 (Naked Single)
  43. Row 1 / Column 4 → 7 (Naked Single)
  44. Row 1 / Column 6 → 4 (Full House)
  45. Row 9 / Column 4 → 3 (Naked Single)
  46. Row 2 / Column 5 → 8 (Naked Single)
  47. Row 2 / Column 4 → 2 (Full House)
  48. Row 7 / Column 6 → 2 (Naked Single)
  49. Row 6 / Column 4 → 1 (Naked Single)
  50. Row 9 / Column 6 → 7 (Naked Single)
  51. Row 7 / Column 9 → 6 (Naked Single)
  52. Row 8 / Column 6 → 1 (Naked Single)
  53. Row 4 / Column 6 → 3 (Full House)
  54. Row 6 / Column 3 → 4 (Naked Single)
  55. Row 8 / Column 4 → 9 (Naked Single)
  56. Row 2 / Column 9 → 3 (Naked Single)
  57. Row 2 / Column 7 → 6 (Full House)
  58. Row 7 / Column 4 → 8 (Naked Single)
  59. Row 5 / Column 4 → 6 (Full House)
  60. Row 6 / Column 5 → 9 (Full House)
  61. Row 9 / Column 8 → 9 (Naked Single)
  62. Row 9 / Column 5 → 6 (Full House)
  63. Row 4 / Column 9 → 9 (Naked Single)
  64. Row 2 / Column 3 → 7 (Naked Single)
  65. Row 2 / Column 1 → 4 (Full House)
  66. Row 6 / Column 9 → 2 (Naked Single)
  67. Row 8 / Column 9 → 4 (Full House)
  68. Row 4 / Column 7 → 5 (Naked Single)
  69. Row 5 / Column 1 → 9 (Naked Single)
  70. Row 5 / Column 3 → 5 (Naked Single)
  71. Row 5 / Column 8 → 4 (Full House)
  72. Row 6 / Column 8 → 6 (Naked Single)
  73. Row 6 / Column 7 → 3 (Full House)
  74. Row 7 / Column 8 → 5 (Full House)
  75. Row 8 / Column 7 → 2 (Full House)
  76. Row 7 / Column 5 → 4 (Full House)
  77. Row 8 / Column 5 → 5 (Full House)
  78. Row 4 / Column 1 → 6 (Naked Single)
  79. Row 4 / Column 3 → 1 (Full House)
  80. Row 8 / Column 3 → 6 (Full House)
  81. Row 8 / Column 1 → 7 (Full House)
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