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

This Sudoku Puzzle has 84 steps and it is solved using Naked Single, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Locked Pair, Hidden Pair, Naked Pair, undefined, Turbot Fish, Swordfish, Empty Rectangle, Sue de Coq, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 4 / Column 6 → 9 (Naked Single)
  2. Row 4 / Column 8 → 2 (Hidden Single)
  3. Row 6 / Column 3 → 2 (Hidden Single)
  4. Locked Candidates Type 1 (Pointing): 2 in b3 => r3c56<>2
  5. Row 2 / Column 6 → 2 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 3 in b4 => r5c589<>3
  7. Row 6 / Column 8 → 3 (Hidden Single)
  8. Locked Candidates Type 2 (Claiming): 3 in r2 => r13c5,r3c4<>3
  9. Naked Triple: 1,3,8 in r4c45,r6c4 => r56c5<>1, r56c5<>8
  10. Locked Pair: 5,7 in r6c56 => r5c56,r6c7<>7
  11. Hidden Pair: 4,6 in r1c35 => r1c3<>3, r1c35<>5, r1c5<>8, r1c5<>9
  12. Locked Candidates Type 1 (Pointing): 8 in b2 => r3c79<>8
  13. Locked Candidates Type 1 (Pointing): 9 in b2 => r3c79<>9
  14. Naked Pair: 4,6 in r15c5 => r2789c5<>6, r378c5<>4
  15. Locked Candidates Type 1 (Pointing): 4 in b8 => r8c23<>4
  16. Hidden Pair: 8,9 in r3c45 => r3c4<>4, r3c5<>5
  17. Row 8 / Column 4 → 4 (Hidden Single)
  18. 2-String Kite: 6 in r1c3,r9c4 (connected by r1c5,r2c4) => r9c3<>6
  19. Turbot Fish: 6 r2c2 =6= r2c4 -6- r9c4 =6= r8c6 => r8c2<>6
  20. Swordfish: 6 r158 c356 => r7c3<>6
  21. Empty Rectangle: 1 in b4 (r2c28) => r5c8<>1
  22. XY-Wing: 4/6/1 in r17c3,r2c2 => r3c3,r78c2<>1
  23. XYZ-Wing: 3/4/5 in r1c1,r3c36 => r3c1<>5
  24. Sue de Coq: r23c2 - {1467} (r468c2 - {1789}, r1c13,r3c3 - {3456}) => r3c1<>3, r7c2<>7, r7c2<>9
  25. Hidden Pair: 3,5 in r1c1,r3c3 => r3c3<>4
  26. Sue de Coq: r78c2 - {46789} (r24c2 - {168}, r7c13,r9c13 - {14579}) => r36c2,r8c3<>1, r8c3<>5, r6c2<>8
  27. Row 6 / Column 2 → 9 (Naked Single)
  28. Locked Candidates Type 1 (Pointing): 5 in b7 => r9c9<>5
  29. Naked Triple: 6,7,8 in r8c236 => r8c58<>7
  30. Row 5 / Column 8 → 7 (Hidden Single)
  31. Naked Triple: 1,8,9 in r156c7 => r379c7<>1, r79c7<>9
  32. Row 3 / Column 7 → 2 (Naked Single)
  33. Locked Candidates Type 2 (Claiming): 1 in c7 => r5c9<>1
  34. W-Wing: 7/6 in r7c7,r8c6 connected by 6 in r9c47 => r7c5<>7
  35. Sue de Coq: r7c12 - {14679} (r7c359 - {1249}, r8c23 - {678}) => r9c1<>7
  36. XY-Chain: 5 5- r1c1 -3- r5c1 -1- r3c1 -7- r3c2 -4- r7c2 -6- r2c2 -1- r2c8 -5 => r1c89<>5
  37. Row 1 / Column 8 → 9 (Naked Single)
  38. Row 1 / Column 7 → 8 (Naked Single)
  39. Row 1 / Column 9 → 3 (Naked Single)
  40. Row 6 / Column 7 → 1 (Naked Single)
  41. Row 1 / Column 1 → 5 (Naked Single)
  42. Row 5 / Column 7 → 9 (Naked Single)
  43. Row 5 / Column 9 → 8 (Full House)
  44. Row 6 / Column 4 → 8 (Naked Single)
  45. Row 3 / Column 3 → 3 (Naked Single)
  46. Row 3 / Column 4 → 9 (Naked Single)
  47. Row 5 / Column 3 → 1 (Naked Single)
  48. Row 3 / Column 5 → 8 (Naked Single)
  49. Row 4 / Column 2 → 8 (Naked Single)
  50. Row 5 / Column 1 → 3 (Full House)
  51. Row 7 / Column 3 → 4 (Naked Single)
  52. Row 9 / Column 3 → 5 (Naked Single)
  53. Row 8 / Column 2 → 7 (Naked Single)
  54. Row 1 / Column 3 → 6 (Naked Single)
  55. Row 1 / Column 5 → 4 (Full House)
  56. Row 8 / Column 3 → 8 (Full House)
  57. Row 7 / Column 2 → 6 (Naked Single)
  58. Row 3 / Column 2 → 4 (Naked Single)
  59. Row 2 / Column 2 → 1 (Full House)
  60. Row 3 / Column 1 → 7 (Full House)
  61. Row 8 / Column 6 → 6 (Naked Single)
  62. Row 3 / Column 6 → 5 (Naked Single)
  63. Row 3 / Column 9 → 1 (Full House)
  64. Row 2 / Column 8 → 5 (Full House)
  65. Row 8 / Column 8 → 1 (Full House)
  66. Row 5 / Column 5 → 6 (Naked Single)
  67. Row 5 / Column 6 → 4 (Full House)
  68. Row 6 / Column 6 → 7 (Full House)
  69. Row 6 / Column 5 → 5 (Full House)
  70. Row 7 / Column 7 → 7 (Naked Single)
  71. Row 9 / Column 7 → 6 (Full House)
  72. Row 9 / Column 4 → 1 (Naked Single)
  73. Row 2 / Column 5 → 3 (Naked Single)
  74. Row 2 / Column 4 → 6 (Full House)
  75. Row 4 / Column 4 → 3 (Full House)
  76. Row 4 / Column 5 → 1 (Full House)
  77. Row 8 / Column 5 → 9 (Naked Single)
  78. Row 8 / Column 9 → 5 (Full House)
  79. Row 9 / Column 1 → 9 (Naked Single)
  80. Row 7 / Column 1 → 1 (Full House)
  81. Row 7 / Column 5 → 2 (Naked Single)
  82. Row 7 / Column 9 → 9 (Full House)
  83. Row 9 / Column 9 → 2 (Full House)
  84. Row 9 / Column 5 → 7 (Full House)
Show More...