Solution for Evil Sudoku #1387231945641

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

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 3 → 2 (Naked Single)
  2. Row 5 / Column 7 → 4 (Naked Single)
  3. Row 5 / Column 8 → 3 (Naked Single)
  4. Row 5 / Column 2 → 5 (Full House)
  5. Row 1 / Column 9 → 5 (Hidden Single)
  6. Row 4 / Column 4 → 5 (Hidden Single)
  7. Row 7 / Column 1 → 5 (Hidden Single)
  8. Row 1 / Column 8 → 8 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 7 in b3 => r2c16<>7
  10. Locked Candidates Type 1 (Pointing): 8 in b6 => r4c6<>8
  11. Locked Candidates Type 1 (Pointing): 2 in b7 => r8c79<>2
  12. Locked Candidates Type 2 (Claiming): 6 in r1 => r2c13,r3c12<>6
  13. Naked Triple: 1,4,6 in r247c6 => r38c6<>6, r68c6<>4, r8c6<>1
  14. Hidden Pair: 3,7 in r8c6,r9c5 => r9c5<>1, r9c5<>9
  15. 2-String Kite: 6 in r3c9,r7c6 (connected by r2c6,r3c4) => r7c9<>6
  16. Locked Candidates Type 2 (Claiming): 6 in r7 => r8c4<>6
  17. XY-Wing: 4/9/6 in r14c2,r6c3 => r1c3<>6
  18. Row 1 / Column 3 → 1 (Naked Single)
  19. XY-Chain: 6 6- r1c2 -4- r1c5 -7- r9c5 -3- r8c6 -7- r8c7 -6 => r8c2<>6
  20. AIC: 6 6- r3c9 =6= r3c4 =8= r3c6 =7= r8c6 -7- r8c7 -6 => r2c7,r89c9<>6
  21. Locked Pair: 2,7 in r2c78 => r2c19,r3c9<>2
  22. Continuous Nice Loop: 1/4/6/9 6= r1c1 =7= r3c1 =2= r8c1 =1= r8c4 -1- r2c4 =1= r2c6 -1- r4c6 -4- r4c2 =4= r1c2 =6= r1c1 =7 => r7c46<>1, r1c1,r4c5<>4, r8c1<>6, r38c1<>9
  23. Skyscraper: 4 in r1c5,r4c6 (connected by r14c2) => r2c6,r6c5<>4
  24. X-Wing: 4 r26 c14 => r78c4<>4
  25. Row 8 / Column 9 → 4 (Hidden Single)
  26. Sue de Coq: r23c4 - {14689} (r78c4 - {169}, r1c5,r3c6 - {478}) => r3c5<>7
  27. Row 3 / Column 5 → 9 (Naked Single)
  28. XY-Chain: 6 6- r2c6 -1- r4c6 -4- r6c4 -8- r3c4 -6 => r2c4<>6
  29. XY-Chain: 2 2- r4c5 -1- r4c6 -4- r7c6 -6- r7c4 -9- r7c9 -2 => r4c9<>2
  30. Row 7 / Column 9 → 2 (Hidden Single)
  31. Finned X-Wing: 9 c29 r49 fr8c2 => r9c1<>9
  32. Hidden Pair: 4,9 in r26c1 => r6c1<>6
  33. Row 6 / Column 3 → 6 (Hidden Single)
  34. Row 8 / Column 7 → 6 (Hidden Single)
  35. Row 8 / Column 6 → 7 (Hidden Single)
  36. Row 3 / Column 6 → 8 (Naked Single)
  37. Row 9 / Column 5 → 3 (Naked Single)
  38. Row 3 / Column 4 → 6 (Naked Single)
  39. Row 6 / Column 6 → 3 (Naked Single)
  40. Row 6 / Column 5 → 2 (Naked Single)
  41. Row 2 / Column 6 → 1 (Naked Single)
  42. Row 3 / Column 9 → 3 (Naked Single)
  43. Row 7 / Column 4 → 9 (Naked Single)
  44. Row 4 / Column 5 → 1 (Naked Single)
  45. Row 6 / Column 8 → 9 (Naked Single)
  46. Row 2 / Column 4 → 4 (Naked Single)
  47. Row 1 / Column 5 → 7 (Full House)
  48. Row 7 / Column 5 → 4 (Full House)
  49. Row 4 / Column 6 → 4 (Naked Single)
  50. Row 6 / Column 4 → 8 (Full House)
  51. Row 8 / Column 4 → 1 (Full House)
  52. Row 6 / Column 1 → 4 (Full House)
  53. Row 7 / Column 6 → 6 (Full House)
  54. Row 7 / Column 8 → 1 (Full House)
  55. Row 4 / Column 2 → 9 (Full House)
  56. Row 2 / Column 9 → 6 (Naked Single)
  57. Row 3 / Column 2 → 2 (Naked Single)
  58. Row 3 / Column 1 → 7 (Full House)
  59. Row 4 / Column 9 → 8 (Naked Single)
  60. Row 4 / Column 7 → 2 (Full House)
  61. Row 9 / Column 9 → 9 (Full House)
  62. Row 2 / Column 1 → 9 (Naked Single)
  63. Row 1 / Column 1 → 6 (Naked Single)
  64. Row 1 / Column 2 → 4 (Full House)
  65. Row 2 / Column 3 → 3 (Full House)
  66. Row 8 / Column 3 → 9 (Full House)
  67. Row 8 / Column 1 → 2 (Naked Single)
  68. Row 8 / Column 2 → 3 (Full House)
  69. Row 9 / Column 2 → 6 (Full House)
  70. Row 9 / Column 1 → 1 (Full House)
  71. Row 9 / Column 8 → 7 (Naked Single)
  72. Row 2 / Column 8 → 2 (Full House)
  73. Row 2 / Column 7 → 7 (Full House)
  74. Row 9 / Column 7 → 8 (Full House)
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