Solution for Evil Sudoku #3123865974141

9
7
5
8
6
4
2
4
1
5
3
4
9
1
3
3
6
2
5
6
4
2
4
8
2
3
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 → 8 (Naked Single)
  2. Row 5 / Column 2 → 6 (Naked Single)
  3. Row 5 / Column 3 → 7 (Naked Single)
  4. Row 5 / Column 8 → 4 (Full House)
  5. Row 1 / Column 1 → 4 (Hidden Single)
  6. Row 4 / Column 6 → 4 (Hidden Single)
  7. Row 7 / Column 9 → 4 (Hidden Single)
  8. Row 1 / Column 2 → 2 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 3 in b1 => r2c49<>3
  10. Locked Candidates Type 1 (Pointing): 2 in b4 => r4c4<>2
  11. Locked Candidates Type 1 (Pointing): 8 in b9 => r8c13<>8
  12. Locked Candidates Type 2 (Claiming): 1 in r1 => r2c79,r3c89<>1
  13. Naked Triple: 1,5,7 in r247c4 => r38c4<>1, r68c4<>7, r8c4<>5
  14. Hidden Pair: 3,6 in r8c4,r9c5 => r9c5<>5, r9c5<>9
  15. 2-String Kite: 1 in r3c1,r7c4 (connected by r2c4,r3c6) => r7c1<>1
  16. Locked Candidates Type 2 (Claiming): 1 in r7 => r8c6<>1
  17. XY-Wing: 7/9/1 in r14c8,r6c7 => r1c7<>1
  18. Row 1 / Column 7 → 5 (Naked Single)
  19. XY-Chain: 1 1- r1c8 -7- r1c5 -3- r9c5 -6- r8c4 -3- r8c3 -1 => r8c8<>1
  20. AIC: 1 1- r3c1 =1= r3c6 =2= r3c4 =3= r8c4 -3- r8c3 -1 => r2c3,r89c1<>1
  21. Locked Pair: 3,8 in r2c23 => r2c19,r3c1<>8
  22. Continuous Nice Loop: 1/5/7/9 1= r1c9 =3= r3c9 =8= r8c9 =5= r8c6 -5- r2c6 =5= r2c4 -5- r4c4 -7- r4c8 =7= r1c8 =1= r1c9 =3 => r8c9<>1, r7c46<>5, r1c9,r4c5<>7, r38c9<>9
  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 - {12579} (r78c6 - {159}, r1c5,r3c4 - {237}) => r3c5<>3
  27. Row 3 / Column 5 → 9 (Naked Single)
  28. XY-Chain: 1 1- r2c4 -5- r4c4 -7- r6c6 -2- r3c6 -1 => r2c6<>1
  29. XY-Chain: 8 8- r4c5 -5- r4c4 -7- r7c4 -1- r7c6 -9- r7c1 -8 => r4c1<>8
  30. Row 7 / Column 1 → 8 (Hidden Single)
  31. Finned X-Wing: 9 c18 r49 fr8c8 => r9c9<>9
  32. Hidden Pair: 7,9 in r26c9 => r6c9<>1
  33. Row 6 / Column 7 → 1 (Hidden Single)
  34. Row 8 / Column 3 → 1 (Hidden Single)
  35. Row 8 / Column 4 → 3 (Hidden Single)
  36. Row 3 / Column 4 → 2 (Naked Single)
  37. Row 9 / Column 5 → 6 (Naked Single)
  38. Row 3 / Column 6 → 1 (Naked Single)
  39. Row 6 / Column 4 → 6 (Naked Single)
  40. Row 6 / Column 5 → 8 (Naked Single)
  41. Row 2 / Column 4 → 5 (Naked Single)
  42. Row 3 / Column 1 → 6 (Naked Single)
  43. Row 7 / Column 6 → 9 (Naked Single)
  44. Row 4 / Column 5 → 5 (Naked Single)
  45. Row 6 / Column 2 → 9 (Naked Single)
  46. Row 2 / Column 6 → 7 (Naked Single)
  47. Row 1 / Column 5 → 3 (Full House)
  48. Row 7 / Column 5 → 7 (Full House)
  49. Row 4 / Column 4 → 7 (Naked Single)
  50. Row 6 / Column 6 → 2 (Full House)
  51. Row 8 / Column 6 → 5 (Full House)
  52. Row 6 / Column 9 → 7 (Full House)
  53. Row 7 / Column 4 → 1 (Full House)
  54. Row 7 / Column 2 → 5 (Full House)
  55. Row 4 / Column 8 → 9 (Full House)
  56. Row 2 / Column 1 → 1 (Naked Single)
  57. Row 3 / Column 8 → 8 (Naked Single)
  58. Row 3 / Column 9 → 3 (Full House)
  59. Row 4 / Column 1 → 2 (Naked Single)
  60. Row 4 / Column 3 → 8 (Full House)
  61. Row 9 / Column 1 → 9 (Full House)
  62. Row 2 / Column 9 → 9 (Naked Single)
  63. Row 1 / Column 9 → 1 (Naked Single)
  64. Row 1 / Column 8 → 7 (Full House)
  65. Row 2 / Column 7 → 6 (Full House)
  66. Row 8 / Column 7 → 9 (Full House)
  67. Row 8 / Column 9 → 8 (Naked Single)
  68. Row 8 / Column 8 → 6 (Full House)
  69. Row 9 / Column 8 → 1 (Full House)
  70. Row 9 / Column 9 → 5 (Full House)
  71. Row 9 / Column 2 → 3 (Naked Single)
  72. Row 2 / Column 2 → 8 (Full House)
  73. Row 2 / Column 3 → 3 (Full House)
  74. Row 9 / Column 3 → 2 (Full House)
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