1
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This Sudoku Puzzle has 83 steps and it is solved using Locked Candidates Type 1 (Pointing), Naked Pair, Locked Candidates Type 2 (Claiming), Hidden Pair, Hidden Triple, undefined, Finned Swordfish, AIC, Locked Triple, Hidden Single, Naked Single, Skyscraper, Full House, Bivalue Universal Grave + 1 techniques.

Naked Single Explanation
Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Locked Candidates Type 1 (Pointing): 5 in b3 => r3c4<>5
  2. Locked Candidates Type 1 (Pointing): 4 in b5 => r4c8<>4
  3. Locked Candidates Type 1 (Pointing): 7 in b6 => r5c4<>7
  4. Locked Candidates Type 1 (Pointing): 7 in b7 => r23c2<>7
  5. Naked Pair: 1,4 in r47c6 => r258c6<>1, r8c6<>4
  6. Locked Candidates Type 2 (Claiming): 4 in r8 => r7c89,r9c789<>4
  7. Hidden Pair: 6,7 in r2c14 => r2c1<>2, r2c1<>9, r2c4<>1, r2c4<>8
  8. Locked Candidates Type 1 (Pointing): 9 in b1 => r46c2<>9
  9. Locked Candidates Type 1 (Pointing): 1 in b2 => r3c79<>1
  10. Hidden Pair: 6,7 in r58c7 => r5c7<>3, r5c7<>9, r8c7<>1, r8c7<>4
  11. Hidden Triple: 1,6,7 in r23c4,r3c5 => r3c45<>8, r3c5<>2
  12. 2-String Kite: 1 in r5c3,r7c6 (connected by r4c6,r5c4) => r7c3<>1
  13. Finned Swordfish: 6 r247 c148 fr4c3 => r5c1<>6
  14. AIC: 9 9- r5c1 -2- r5c6 -8- r8c6 -5- r8c2 =5= r9c1 =4= r3c1 -4- r1c3 =4= r1c7 -4- r6c7 -9 => r5c89,r6c1<>9
  15. Locked Triple: 3,6,7 in r5c789 => r4c8,r5c3<>3, r4c8,r5c3<>6
  16. AIC: 2 2- r1c5 -8- r1c4 -5- r9c4 =5= r9c1 -5- r6c1 -2- r6c5 =2= r5c6 -2 => r12c6,r6c5<>2
  17. Row 5 / Column 6 → 2 (Hidden Single)
  18. Row 5 / Column 1 → 9 (Naked Single)
  19. Row 1 / Column 5 → 2 (Hidden Single)
  20. AIC: 7 7- r5c9 -3- r5c8 -6- r7c8 =6= r7c4 -6- r2c4 =6= r2c1 -6- r4c1 -5- r9c1 =5= r9c4 -5- r1c4 -8- r5c4 -1- r3c4 =1= r3c5 =6= r8c5 -6- r8c7 -7 => r5c7,r78c9<>7
  21. Row 5 / Column 7 → 6 (Naked Single)
  22. Row 5 / Column 8 → 3 (Naked Single)
  23. Row 8 / Column 7 → 7 (Naked Single)
  24. Row 5 / Column 9 → 7 (Naked Single)
  25. Row 7 / Column 2 → 7 (Hidden Single)
  26. Skyscraper: 1 in r7c6,r8c2 (connected by r4c26) => r8c5<>1
  27. XY-Chain: 9 9- r6c5 -8- r5c4 -1- r4c6 -4- r7c6 -1- r7c9 -9 => r6c9<>9
  28. XY-Chain: 9 9- r4c8 -5- r6c9 -4- r6c7 -9- r6c5 -8- r5c4 -1- r4c6 -4- r7c6 -1- r7c9 -9 => r79c8<>9
  29. AIC: 1 1- r4c2 =1= r8c2 =5= r9c1 =4= r3c1 -4- r1c3 =4= r1c7 -4- r6c7 -9- r6c5 -8- r5c4 -1 => r4c456,r5c3<>1
  30. Row 4 / Column 6 → 4 (Naked Single)
  31. Row 5 / Column 3 → 8 (Naked Single)
  32. Row 5 / Column 4 → 1 (Full House)
  33. Row 7 / Column 6 → 1 (Naked Single)
  34. Row 7 / Column 9 → 9 (Naked Single)
  35. Row 6 / Column 5 → 8 (Hidden Single)
  36. Row 8 / Column 5 → 6 (Naked Single)
  37. Row 9 / Column 5 → 9 (Naked Single)
  38. Row 7 / Column 4 → 4 (Naked Single)
  39. Row 4 / Column 5 → 7 (Naked Single)
  40. Row 3 / Column 5 → 1 (Full House)
  41. Row 4 / Column 4 → 9 (Full House)
  42. Row 7 / Column 3 → 2 (Naked Single)
  43. Row 7 / Column 8 → 6 (Full House)
  44. Row 4 / Column 8 → 5 (Naked Single)
  45. Row 4 / Column 1 → 6 (Naked Single)
  46. Row 6 / Column 9 → 4 (Naked Single)
  47. Row 6 / Column 7 → 9 (Full House)
  48. Row 2 / Column 1 → 7 (Naked Single)
  49. Row 2 / Column 4 → 6 (Naked Single)
  50. Row 3 / Column 4 → 7 (Naked Single)
  51. Row 2 / Column 8 → 9 (Hidden Single)
  52. Row 3 / Column 9 → 5 (Hidden Single)
  53. Row 3 / Column 3 → 6 (Hidden Single)
  54. Row 8 / Column 8 → 4 (Hidden Single)
  55. Row 1 / Column 2 → 9 (Hidden Single)
  56. Locked Candidates Type 2 (Claiming): 8 in r1 => r2c6<>8
  57. Row 2 / Column 6 → 3 (Naked Single)
  58. Row 9 / Column 9 → 3 (Hidden Single)
  59. Naked Pair: 1,2 in r29c7 => r3c7<>2
  60. Bivalue Universal Grave + 1 => r3c2<>3, r3c2<>8
  61. Row 3 / Column 2 → 2 (Naked Single)
  62. Row 2 / Column 2 → 8 (Naked Single)
  63. Row 3 / Column 1 → 4 (Naked Single)
  64. Row 1 / Column 3 → 3 (Full House)
  65. Row 3 / Column 8 → 8 (Naked Single)
  66. Row 3 / Column 7 → 3 (Full House)
  67. Row 9 / Column 8 → 2 (Full House)
  68. Row 6 / Column 2 → 5 (Naked Single)
  69. Row 6 / Column 1 → 2 (Full House)
  70. Row 9 / Column 1 → 5 (Full House)
  71. Row 2 / Column 9 → 1 (Naked Single)
  72. Row 2 / Column 7 → 2 (Full House)
  73. Row 1 / Column 7 → 4 (Full House)
  74. Row 9 / Column 7 → 1 (Full House)
  75. Row 8 / Column 9 → 8 (Full House)
  76. Row 4 / Column 3 → 1 (Naked Single)
  77. Row 9 / Column 3 → 4 (Full House)
  78. Row 8 / Column 2 → 1 (Full House)
  79. Row 9 / Column 4 → 8 (Full House)
  80. Row 8 / Column 6 → 5 (Full House)
  81. Row 4 / Column 2 → 3 (Full House)
  82. Row 1 / Column 4 → 5 (Full House)
  83. Row 1 / Column 6 → 8 (Full House)
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