Solution for Evil Sudoku #1152476391841

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

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.

Naked Single Explanation
Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 5 / Column 7 → 4 (Naked Single)
  2. Row 5 / Column 2 → 7 (Naked Single)
  3. Row 5 / Column 3 → 9 (Naked Single)
  4. Row 5 / Column 8 → 1 (Full House)
  5. Row 3 / Column 9 → 1 (Hidden Single)
  6. Row 6 / Column 6 → 1 (Hidden Single)
  7. Row 9 / Column 1 → 1 (Hidden Single)
  8. Row 9 / Column 2 → 5 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 4 in b3 => r2c13<>4
  10. Locked Candidates Type 1 (Pointing): 5 in b4 => r6c4<>5
  11. Locked Candidates Type 1 (Pointing): 2 in b7 => r8c49<>2
  12. Locked Candidates Type 2 (Claiming): 8 in r9 => r7c89,r8c79<>8
  13. Naked Triple: 6,8,9 in r368c4 => r2c4<>6, r27c4<>8, r24c4<>9
  14. Hidden Pair: 2,7 in r1c5,r2c4 => r1c5<>3, r1c5<>6
  15. 2-String Kite: 8 in r3c4,r7c1 (connected by r7c6,r8c4) => r3c1<>8
  16. Locked Candidates Type 2 (Claiming): 8 in r3 => r2c6<>8
  17. XY-Wing: 3/9/8 in r4c7,r69c8 => r9c7<>8
  18. Row 9 / Column 7 → 6 (Naked Single)
  19. XY-Chain: 8 8- r2c3 -2- r2c4 -7- r1c5 -2- r9c5 -9- r9c8 -8 => r2c8<>8
  20. AIC: 8 8- r2c3 -2- r2c4 =2= r7c4 =5= r7c6 =8= r7c1 -8 => r12c1,r8c3<>8
  21. Locked Pair: 2,4 in r8c23 => r78c1,r8c9<>4
  22. Continuous Nice Loop: 3/6/8/9 4= r2c9 =6= r2c6 -6- r8c6 =6= r8c4 -6- r6c4 -9- r6c8 =9= r9c8 =8= r9c9 =2= r7c9 =4= r2c9 =6 => r27c9<>3, r3c46<>6, r2c9<>8, 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 - {35689} (r23c6 - {368}, r7c4,r9c5 - {259}) => r7c5<>2
  27. Row 7 / Column 5 → 3 (Naked Single)
  28. XY-Chain: 7 7- r1c5 -2- r9c5 -9- r9c8 -8- r9c9 -2- r7c9 -4- r7c8 -7 => r1c8<>7
  29. Row 1 / Column 5 → 7 (Hidden Single)
  30. Row 2 / Column 4 → 2 (Naked Single)
  31. Row 4 / Column 5 → 4 (Naked Single)
  32. Row 2 / Column 3 → 8 (Naked Single)
  33. Row 7 / Column 4 → 5 (Naked Single)
  34. Row 4 / Column 2 → 3 (Naked Single)
  35. Row 6 / Column 5 → 6 (Naked Single)
  36. Row 4 / Column 4 → 7 (Naked Single)
  37. Row 7 / Column 6 → 8 (Naked Single)
  38. Row 4 / Column 7 → 8 (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 → 5 (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 → 7 (Naked Single)
  47. Row 8 / Column 4 → 6 (Naked Single)
  48. Row 3 / Column 4 → 8 (Full House)
  49. Row 2 / Column 6 → 6 (Full House)
  50. Row 8 / Column 6 → 9 (Full House)
  51. Row 9 / Column 9 → 8 (Naked Single)
  52. Row 9 / Column 8 → 9 (Full House)
  53. Row 8 / Column 9 → 3 (Naked Single)
  54. Row 1 / Column 8 → 8 (Naked Single)
  55. Row 3 / Column 1 → 4 (Naked Single)
  56. Row 3 / Column 2 → 6 (Full House)
  57. Row 7 / Column 8 → 4 (Naked Single)
  58. Row 2 / Column 8 → 7 (Full House)
  59. Row 7 / Column 9 → 2 (Full House)
  60. Row 8 / Column 7 → 7 (Full House)
  61. Row 2 / Column 7 → 3 (Full House)
  62. Row 2 / Column 9 → 4 (Full House)
  63. Row 1 / Column 9 → 6 (Full House)
  64. Row 8 / Column 1 → 8 (Naked Single)
  65. Row 6 / Column 1 → 5 (Naked Single)
  66. Row 1 / Column 1 → 3 (Full House)
  67. Row 6 / Column 3 → 4 (Full House)
  68. Row 1 / Column 2 → 2 (Naked Single)
  69. Row 1 / Column 3 → 5 (Full House)
  70. Row 8 / Column 3 → 2 (Full House)
  71. Row 8 / Column 2 → 4 (Full House)
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