Solution for Evil Sudoku #3168953271441

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

This Sudoku Puzzle has 74 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 5 / Column 7 → 9 (Naked Single)
  2. Row 5 / Column 2 → 5 (Naked Single)
  3. Row 5 / Column 3 → 7 (Naked Single)
  4. Row 5 / Column 8 → 1 (Full House)
  5. Row 1 / Column 1 → 1 (Hidden Single)
  6. Row 4 / Column 6 → 1 (Hidden Single)
  7. Row 7 / Column 9 → 1 (Hidden Single)
  8. Row 1 / Column 2 → 6 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 8 in b1 => r2c49<>8
  10. Locked Candidates Type 1 (Pointing): 6 in b4 => r4c4<>6
  11. Locked Candidates Type 1 (Pointing): 9 in b9 => r8c13<>9
  12. Locked Candidates Type 2 (Claiming): 4 in r1 => r2c79,r3c89<>4
  13. Naked Triple: 3,4,7 in r247c4 => r38c4<>4, r68c4<>7, r8c4<>3
  14. Hidden Pair: 5,8 in r8c4,r9c5 => r9c5<>2, r9c5<>3
  15. 2-String Kite: 4 in r3c1,r7c4 (connected by r2c4,r3c6) => r7c1<>4
  16. Locked Candidates Type 2 (Claiming): 4 in r7 => r8c6<>4
  17. XY-Wing: 2/7/4 in r14c8,r6c7 => r1c7<>4
  18. Row 1 / Column 7 → 3 (Naked Single)
  19. XY-Chain: 4 4- r1c8 -7- r1c5 -8- r9c5 -5- r8c4 -8- r8c3 -4 => r8c8<>4
  20. AIC: 4 4- r3c1 =4= r3c6 =6= r3c4 =8= r8c4 -8- r8c3 -4 => r2c3,r89c1<>4
  21. Locked Pair: 8,9 in r2c23 => r2c19,r3c1<>9
  22. Continuous Nice Loop: 2/3/4/7 4= r1c9 =8= r3c9 =9= r8c9 =3= r8c6 -3- r2c6 =3= r2c4 -3- r4c4 -7- r4c8 =7= r1c8 =4= r1c9 =8 => r38c9<>2, r7c46<>3, r8c9<>4, r1c9,r4c5<>7
  23. Skyscraper: 7 in r1c5,r4c4 (connected by r14c8) => r2c4,r6c5<>7
  24. X-Wing: 7 r26 c69 => r78c6<>7
  25. Row 8 / Column 1 → 7 (Hidden Single)
  26. Sue de Coq: r23c6 - {23467} (r78c6 - {234}, r1c5,r3c4 - {678}) => r3c5<>8
  27. Row 3 / Column 5 → 2 (Naked Single)
  28. XY-Chain: 4 4- r2c4 -3- r4c4 -7- r6c6 -6- r3c6 -4 => r2c6<>4
  29. XY-Chain: 9 9- r4c5 -3- r4c4 -7- r7c4 -4- r7c6 -2- r7c1 -9 => r4c1<>9
  30. Row 7 / Column 1 → 9 (Hidden Single)
  31. Finned X-Wing: 2 c18 r49 fr8c8 => r9c9<>2
  32. Hidden Pair: 2,7 in r26c9 => r6c9<>4
  33. Row 6 / Column 7 → 4 (Hidden Single)
  34. Row 8 / Column 3 → 4 (Hidden Single)
  35. Row 8 / Column 4 → 8 (Hidden Single)
  36. Row 3 / Column 4 → 6 (Naked Single)
  37. Row 9 / Column 5 → 5 (Naked Single)
  38. Row 3 / Column 6 → 4 (Naked Single)
  39. Row 6 / Column 4 → 5 (Naked Single)
  40. Row 6 / Column 5 → 9 (Naked Single)
  41. Row 2 / Column 4 → 3 (Naked Single)
  42. Row 3 / Column 1 → 5 (Naked Single)
  43. Row 7 / Column 6 → 2 (Naked Single)
  44. Row 4 / Column 5 → 3 (Naked Single)
  45. Row 6 / Column 2 → 2 (Naked Single)
  46. Row 2 / Column 6 → 7 (Naked Single)
  47. Row 1 / Column 5 → 8 (Full House)
  48. Row 7 / Column 5 → 7 (Full House)
  49. Row 4 / Column 4 → 7 (Naked Single)
  50. Row 6 / Column 6 → 6 (Full House)
  51. Row 8 / Column 6 → 3 (Full House)
  52. Row 6 / Column 9 → 7 (Full House)
  53. Row 7 / Column 4 → 4 (Full House)
  54. Row 7 / Column 2 → 3 (Full House)
  55. Row 4 / Column 8 → 2 (Full House)
  56. Row 2 / Column 1 → 4 (Naked Single)
  57. Row 3 / Column 8 → 9 (Naked Single)
  58. Row 3 / Column 9 → 8 (Full House)
  59. Row 4 / Column 1 → 6 (Naked Single)
  60. Row 4 / Column 3 → 9 (Full House)
  61. Row 9 / Column 1 → 2 (Full House)
  62. Row 2 / Column 9 → 2 (Naked Single)
  63. Row 1 / Column 9 → 4 (Naked Single)
  64. Row 1 / Column 8 → 7 (Full House)
  65. Row 2 / Column 7 → 5 (Full House)
  66. Row 8 / Column 7 → 2 (Full House)
  67. Row 8 / Column 9 → 9 (Naked Single)
  68. Row 8 / Column 8 → 5 (Full House)
  69. Row 9 / Column 8 → 4 (Full House)
  70. Row 9 / Column 9 → 3 (Full House)
  71. Row 9 / Column 2 → 8 (Naked Single)
  72. Row 2 / Column 2 → 9 (Full House)
  73. Row 2 / Column 3 → 8 (Full House)
  74. Row 9 / Column 3 → 6 (Full House)
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