Solution for Evil Sudoku #1142685397141

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

This Sudoku Puzzle has 71 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 → 6 (Naked Single)
  2. Row 5 / Column 2 → 8 (Naked Single)
  3. Row 5 / Column 3 → 9 (Naked Single)
  4. Row 5 / Column 8 → 7 (Full House)
  5. Row 3 / Column 9 → 7 (Hidden Single)
  6. Row 6 / Column 6 → 7 (Hidden Single)
  7. Row 9 / Column 1 → 7 (Hidden Single)
  8. Row 9 / Column 2 → 4 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 6 in b3 => r2c13<>6
  10. Locked Candidates Type 1 (Pointing): 4 in b4 => r6c4<>4
  11. Locked Candidates Type 1 (Pointing): 2 in b7 => r8c49<>2
  12. Locked Candidates Type 2 (Claiming): 1 in r9 => r7c89,r8c79<>1
  13. Naked Triple: 1,5,9 in r368c4 => r27c4<>1, r2c4<>5, r24c4<>9
  14. Hidden Pair: 2,8 in r1c5,r2c4 => r1c5<>3, r1c5<>5
  15. 2-String Kite: 1 in r3c4,r7c1 (connected by r7c6,r8c4) => r3c1<>1
  16. Locked Candidates Type 2 (Claiming): 1 in r3 => r2c6<>1
  17. XY-Wing: 3/9/1 in r4c7,r69c8 => r9c7<>1
  18. Row 9 / Column 7 → 5 (Naked Single)
  19. XY-Chain: 1 1- r2c3 -2- r2c4 -8- r1c5 -2- r9c5 -9- r9c8 -1 => r2c8<>1
  20. AIC: 1 1- r2c3 -2- r2c4 =2= r7c4 =4= r7c6 =1= r7c1 -1 => r12c1,r8c3<>1
  21. Locked Pair: 2,6 in r8c23 => r78c1,r8c9<>6
  22. Continuous Nice Loop: 1/3/5/9 6= r2c9 =5= r2c6 -5- r8c6 =5= r8c4 -5- r6c4 -9- r6c8 =9= r9c8 =1= r9c9 =2= r7c9 =6= r2c9 =5 => r2c9<>1, r27c9<>3, r3c46<>5, r6c5,r9c9<>9
  23. Skyscraper: 9 in r6c4,r9c5 (connected by r69c8) => r4c5,r8c4<>9
  24. X-Wing: 9 r48 c69 => r23c6<>9
  25. Row 2 / Column 1 → 9 (Hidden Single)
  26. Sue de Coq: r78c6 - {13459} (r23c6 - {135}, r7c4,r9c5 - {249}) => r7c5<>2
  27. Row 7 / Column 5 → 3 (Naked Single)
  28. XY-Chain: 8 8- r1c5 -2- r9c5 -9- r9c8 -1- r9c9 -2- r7c9 -6- r7c8 -8 => r1c8<>8
  29. Row 1 / Column 5 → 8 (Hidden Single)
  30. Row 2 / Column 4 → 2 (Naked Single)
  31. Row 4 / Column 5 → 6 (Naked Single)
  32. Row 2 / Column 3 → 1 (Naked Single)
  33. Row 7 / Column 4 → 4 (Naked Single)
  34. Row 4 / Column 2 → 3 (Naked Single)
  35. Row 6 / Column 5 → 5 (Naked Single)
  36. Row 4 / Column 4 → 8 (Naked Single)
  37. Row 7 / Column 6 → 1 (Naked Single)
  38. Row 4 / Column 7 → 1 (Naked Single)
  39. Row 3 / Column 5 → 9 (Naked Single)
  40. Row 9 / Column 5 → 2 (Full House)
  41. Row 6 / Column 4 → 9 (Naked Single)
  42. Row 4 / Column 6 → 4 (Full House)
  43. Row 4 / Column 9 → 9 (Full House)
  44. Row 6 / Column 8 → 3 (Full House)
  45. Row 3 / Column 6 → 3 (Naked Single)
  46. Row 7 / Column 1 → 8 (Naked Single)
  47. Row 8 / Column 4 → 5 (Naked Single)
  48. Row 3 / Column 4 → 1 (Full House)
  49. Row 2 / Column 6 → 5 (Full House)
  50. Row 8 / Column 6 → 9 (Full House)
  51. Row 9 / Column 9 → 1 (Naked Single)
  52. Row 9 / Column 8 → 9 (Full House)
  53. Row 8 / Column 9 → 3 (Naked Single)
  54. Row 1 / Column 8 → 1 (Naked Single)
  55. Row 3 / Column 1 → 6 (Naked Single)
  56. Row 3 / Column 2 → 5 (Full House)
  57. Row 7 / Column 8 → 6 (Naked Single)
  58. Row 2 / Column 8 → 8 (Full House)
  59. Row 7 / Column 9 → 2 (Full House)
  60. Row 8 / Column 7 → 8 (Full House)
  61. Row 2 / Column 7 → 3 (Full House)
  62. Row 2 / Column 9 → 6 (Full House)
  63. Row 1 / Column 9 → 5 (Full House)
  64. Row 8 / Column 1 → 1 (Naked Single)
  65. Row 6 / Column 1 → 4 (Naked Single)
  66. Row 1 / Column 1 → 3 (Full House)
  67. Row 6 / Column 3 → 6 (Full House)
  68. Row 1 / Column 2 → 2 (Naked Single)
  69. Row 1 / Column 3 → 4 (Full House)
  70. Row 8 / Column 3 → 2 (Full House)
  71. Row 8 / Column 2 → 6 (Full House)
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