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1

This Sudoku Puzzle has 76 steps and it is solved using Hidden Single, Locked Triple, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Uniqueness Test 2, Empty Rectangle, Hidden Rectangle, AIC, Continuous Nice Loop, Naked Single, Sue de Coq, undefined, Full House techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 6 → 5 (Hidden Single)
  2. Row 8 / Column 2 → 4 (Hidden Single)
  3. Row 6 / Column 3 → 1 (Hidden Single)
  4. Row 4 / Column 7 → 1 (Hidden Single)
  5. Row 6 / Column 2 → 5 (Hidden Single)
  6. Row 9 / Column 3 → 5 (Hidden Single)
  7. Row 7 / Column 1 → 1 (Hidden Single)
  8. Locked Triple: 1,7,8 in r8c456 => r8c789<>8, r79c5,r8c89<>7
  9. Locked Candidates Type 1 (Pointing): 6 in b1 => r3c789<>6
  10. Locked Candidates Type 1 (Pointing): 4 in b6 => r5c5<>4
  11. Locked Candidates Type 1 (Pointing): 3 in b8 => r6c5<>3
  12. Locked Candidates Type 1 (Pointing): 9 in b8 => r35c5<>9
  13. Locked Candidates Type 1 (Pointing): 7 in b9 => r13c9<>7
  14. Locked Candidates Type 2 (Claiming): 3 in c8 => r4c9<>3
  15. Uniqueness Test 2: 3/9 in r7c57,r9c57 => r135c7,r79c9<>8
  16. Empty Rectangle: 8 in b3 (r34c2) => r4c9<>8
  17. Hidden Rectangle: 3/8 in r4c48,r6c48 => r4c8<>8
  18. Hidden Rectangle: 1/7 in r3c45,r8c45 => r3c4<>7
  19. AIC: 7 7- r3c8 =7= r2c8 =6= r2c7 =4= r2c6 -4- r6c6 -8- r8c6 =8= r8c4 =1= r3c4 =9= r3c2 -9- r2c2 -7 => r2c8,r3c123<>7
  20. Row 3 / Column 8 → 7 (Hidden Single)
  21. Locked Candidates Type 1 (Pointing): 8 in b3 => r5c9<>8
  22. Continuous Nice Loop: 2/6/8 8= r5c8 =5= r8c8 =2= r2c8 =6= r2c7 =4= r2c6 -4- r6c6 -8- r6c8 =8= r5c8 =5 => r2c7<>2, r58c8<>6, r6c4<>8
  23. Row 6 / Column 4 → 3 (Naked Single)
  24. Row 4 / Column 8 → 3 (Hidden Single)
  25. Continuous Nice Loop: 2/6/7/8 6= r4c1 =2= r4c4 -2- r2c4 =2= r2c8 =6= r6c8 -6- r4c9 =6= r4c1 =2 => r35c4<>2, r5c79<>6, r4c1<>7, r4c1<>8
  26. Sue de Coq: r5c13 - {2678} (r5c4789 - {45789}, r4c1 - {26}) => r5c5<>7
  27. Empty Rectangle: 7 in b5 (r24c2) => r2c4<>7
  28. W-Wing: 8/7 in r4c2,r8c6 connected by 7 in r2c26 => r4c6<>8
  29. Sue de Coq: r123c7 - {23456} (r579c7 - {34589}, r2c8 - {26}) => r8c7<>5
  30. XY-Chain: 2 2- r4c1 -6- r4c9 -9- r4c6 -7- r8c6 -8- r6c6 -4- r6c5 -6- r5c5 -2 => r4c4,r5c13<>2
  31. Row 4 / Column 1 → 2 (Hidden Single)
  32. Row 2 / Column 4 → 2 (Hidden Single)
  33. Row 2 / Column 8 → 6 (Naked Single)
  34. Row 2 / Column 7 → 4 (Naked Single)
  35. Row 6 / Column 8 → 8 (Naked Single)
  36. Row 5 / Column 8 → 5 (Naked Single)
  37. Row 8 / Column 8 → 2 (Full House)
  38. Row 6 / Column 6 → 4 (Naked Single)
  39. Row 6 / Column 5 → 6 (Full House)
  40. Row 5 / Column 7 → 9 (Naked Single)
  41. Row 8 / Column 7 → 6 (Naked Single)
  42. Row 5 / Column 5 → 2 (Naked Single)
  43. Row 4 / Column 9 → 6 (Naked Single)
  44. Row 5 / Column 9 → 4 (Full House)
  45. Row 8 / Column 9 → 5 (Naked Single)
  46. Row 3 / Column 9 → 8 (Naked Single)
  47. Row 1 / Column 9 → 3 (Naked Single)
  48. Row 3 / Column 2 → 9 (Naked Single)
  49. Row 1 / Column 7 → 2 (Naked Single)
  50. Row 3 / Column 7 → 5 (Full House)
  51. Row 2 / Column 2 → 7 (Naked Single)
  52. Row 2 / Column 6 → 9 (Full House)
  53. Row 4 / Column 2 → 8 (Full House)
  54. Row 3 / Column 4 → 1 (Naked Single)
  55. Row 1 / Column 3 → 8 (Naked Single)
  56. Row 4 / Column 6 → 7 (Naked Single)
  57. Row 4 / Column 4 → 9 (Full House)
  58. Row 5 / Column 4 → 8 (Full House)
  59. Row 8 / Column 6 → 8 (Full House)
  60. Row 8 / Column 4 → 7 (Full House)
  61. Row 8 / Column 5 → 1 (Full House)
  62. Row 3 / Column 5 → 4 (Naked Single)
  63. Row 1 / Column 5 → 7 (Full House)
  64. Row 1 / Column 1 → 4 (Full House)
  65. Row 7 / Column 3 → 7 (Naked Single)
  66. Row 9 / Column 1 → 8 (Full House)
  67. Row 3 / Column 1 → 6 (Naked Single)
  68. Row 3 / Column 3 → 2 (Full House)
  69. Row 5 / Column 3 → 6 (Full House)
  70. Row 5 / Column 1 → 7 (Full House)
  71. Row 7 / Column 9 → 9 (Naked Single)
  72. Row 9 / Column 9 → 7 (Full House)
  73. Row 9 / Column 7 → 3 (Naked Single)
  74. Row 7 / Column 7 → 8 (Full House)
  75. Row 7 / Column 5 → 3 (Full House)
  76. Row 9 / Column 5 → 9 (Full House)
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