Solution for Evil Sudoku #1217283564941

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

This Sudoku Puzzle has 73 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Pair, undefined, AIC, Locked Pair, Continuous Nice Loop, Skyscraper, Sue de Coq techniques.

Try To Solve This Puzzle

Solution Steps:

  1. Row 7 / Column 5 → 2 (Naked Single)
  2. Row 2 / Column 5 → 8 (Naked Single)
  3. Row 3 / Column 5 → 6 (Naked Single)
  4. Row 8 / Column 5 → 4 (Full House)
  5. Row 6 / Column 4 → 4 (Hidden Single)
  6. Row 1 / Column 1 → 4 (Hidden Single)
  7. Row 9 / Column 7 → 4 (Hidden Single)
  8. Row 2 / Column 1 → 1 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 7 in b1 => r49c2<>7
  10. Locked Candidates Type 1 (Pointing): 1 in b2 => r4c4<>1
  11. Locked Candidates Type 1 (Pointing): 2 in b9 => r13c8<>2
  12. Locked Candidates Type 2 (Claiming): 9 in c1 => r79c2,r89c3<>9
  13. Naked Triple: 3,6,9 in r4c247 => r4c38<>9, r4c68<>6, r4c8<>3
  14. Hidden Pair: 7,8 in r4c8,r5c9 => r5c9<>3, r5c9<>5
  15. 2-String Kite: 9 in r1c3,r4c7 (connected by r4c2,r6c3) => r1c7<>9
  16. Locked Candidates Type 2 (Claiming): 9 in c7 => r6c8<>9
  17. XY-Wing: 5/6/9 in r7c6,r8c14 => r7c1<>9
  18. Row 7 / Column 1 → 3 (Naked Single)
  19. XY-Chain: 9 9- r3c8 -7- r4c8 -8- r5c9 -7- r5c1 -6- r8c1 -9 => r8c8<>9
  20. AIC: 9 9- r1c3 =9= r6c3 =1= r4c3 =7= r4c8 -7- r3c8 -9 => r1c89,r3c2<>9
  21. Locked Pair: 2,7 in r23c2 => r1c23,r9c2<>2
  22. Continuous Nice Loop: 3/5/6/9 9= r9c1 =7= r9c3 =2= r9c8 =3= r6c8 -3- r6c2 =3= r4c2 -3- r4c4 -6- r8c4 =6= r8c1 =9= r9c1 =7 => r46c7<>3, r9c38<>5, r5c4,r9c1<>6, r9c8<>9
  23. Skyscraper: 6 in r4c4,r5c1 (connected by r8c14) => r4c2,r5c6<>6
  24. X-Wing: 6 c26 r69 => r6c78<>6
  25. Row 1 / Column 8 → 6 (Hidden Single)
  26. Sue de Coq: r6c23 - {13569} (r6c78 - {359}, r4c3,r5c1 - {167}) => r5c3<>7
  27. Row 5 / Column 3 → 5 (Naked Single)
  28. XY-Chain: 2 2- r1c7 -5- r6c7 -9- r4c7 -6- r4c4 -3- r5c4 -2 => r1c4<>2
  29. Row 1 / Column 7 → 2 (Hidden Single)
  30. Finned X-Wing: 5 r18 c49 fr8c8 => r9c9<>5
  31. Hidden Pair: 5,6 in r9c26 => r9c6<>9
  32. Row 7 / Column 6 → 9 (Hidden Single)
  33. Row 3 / Column 8 → 9 (Hidden Single)
  34. Row 4 / Column 8 → 7 (Hidden Single)
  35. Row 4 / Column 3 → 1 (Naked Single)
  36. Row 5 / Column 9 → 8 (Naked Single)
  37. Row 4 / Column 6 → 8 (Naked Single)
  38. Row 6 / Column 3 → 9 (Naked Single)
  39. Row 5 / Column 6 → 2 (Naked Single)
  40. Row 1 / Column 3 → 8 (Naked Single)
  41. Row 4 / Column 2 → 3 (Naked Single)
  42. Row 6 / Column 7 → 5 (Naked Single)
  43. Row 2 / Column 6 → 5 (Naked Single)
  44. Row 5 / Column 4 → 3 (Naked Single)
  45. Row 1 / Column 2 → 9 (Naked Single)
  46. Row 8 / Column 3 → 2 (Naked Single)
  47. Row 9 / Column 3 → 7 (Full House)
  48. Row 4 / Column 4 → 6 (Naked Single)
  49. Row 4 / Column 7 → 9 (Full House)
  50. Row 6 / Column 6 → 1 (Full House)
  51. Row 9 / Column 6 → 6 (Full House)
  52. Row 8 / Column 4 → 5 (Full House)
  53. Row 6 / Column 2 → 6 (Naked Single)
  54. Row 6 / Column 8 → 3 (Full House)
  55. Row 5 / Column 7 → 6 (Full House)
  56. Row 2 / Column 7 → 3 (Full House)
  57. Row 5 / Column 1 → 7 (Full House)
  58. Row 1 / Column 4 → 1 (Naked Single)
  59. Row 1 / Column 9 → 5 (Full House)
  60. Row 3 / Column 4 → 2 (Full House)
  61. Row 9 / Column 1 → 9 (Naked Single)
  62. Row 8 / Column 1 → 6 (Full House)
  63. Row 9 / Column 2 → 5 (Naked Single)
  64. Row 7 / Column 2 → 8 (Full House)
  65. Row 7 / Column 8 → 5 (Full House)
  66. Row 8 / Column 8 → 8 (Naked Single)
  67. Row 8 / Column 9 → 9 (Full House)
  68. Row 9 / Column 8 → 2 (Full House)
  69. Row 9 / Column 9 → 3 (Full House)
  70. Row 2 / Column 9 → 7 (Naked Single)
  71. Row 2 / Column 2 → 2 (Full House)
  72. Row 3 / Column 2 → 7 (Full House)
  73. Row 3 / Column 9 → 1 (Full House)
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