Solution for Evil Sudoku #2225641397841

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

This Sudoku Puzzle has 73 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 7 / Column 5 → 6 (Naked Single)
  2. Row 2 / Column 5 → 4 (Naked Single)
  3. Row 3 / Column 5 → 9 (Naked Single)
  4. Row 8 / Column 5 → 7 (Full House)
  5. Row 6 / Column 6 → 7 (Hidden Single)
  6. Row 1 / Column 9 → 7 (Hidden Single)
  7. Row 9 / Column 3 → 7 (Hidden Single)
  8. Row 2 / Column 9 → 2 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 2 in b2 => r4c6<>2
  10. Locked Candidates Type 1 (Pointing): 5 in b3 => r49c8<>5
  11. Locked Candidates Type 1 (Pointing): 6 in b7 => r13c2<>6
  12. Locked Candidates Type 2 (Claiming): 8 in c9 => r79c8,r89c7<>8
  13. Naked Triple: 1,8,9 in r4c368 => r4c2<>1, r4c27<>8, r4c24<>9
  14. Hidden Pair: 4,5 in r4c2,r5c1 => r5c1<>1, r5c1<>3
  15. 2-String Kite: 8 in r1c7,r4c3 (connected by r4c8,r6c7) => r1c3<>8
  16. Locked Candidates Type 2 (Claiming): 8 in c3 => r6c2<>8
  17. XY-Wing: 3/9/8 in r7c4,r8c69 => r7c9<>8
  18. Row 7 / Column 9 → 1 (Naked Single)
  19. XY-Chain: 8 8- r3c2 -5- r4c2 -4- r5c1 -5- r5c9 -9- r8c9 -8 => r8c2<>8
  20. AIC: 8 8- r1c7 =8= r6c7 =2= r4c7 =5= r4c2 -5- r3c2 -8 => r1c12,r3c8<>8
  21. Locked Pair: 5,6 in r23c8 => r1c78,r9c8<>6
  22. Continuous Nice Loop: 1/3/8/9 6= r9c2 =1= r6c2 -1- r6c8 =1= r4c8 -1- r4c6 -9- r8c6 =9= r8c9 =8= r9c9 =5= r9c7 =6= r9c2 =1 => r46c3<>1, r9c27<>3, r9c2<>8, r5c6,r9c9<>9
  23. Skyscraper: 9 in r4c6,r5c9 (connected by r8c69) => r4c8,r5c4<>9
  24. X-Wing: 9 c48 r69 => r6c23<>9
  25. Row 1 / Column 2 → 9 (Hidden Single)
  26. Sue de Coq: r6c78 - {12389} (r6c23 - {138}, r4c7,r5c9 - {259}) => r5c7<>5
  27. Row 5 / Column 7 → 3 (Naked Single)
  28. XY-Chain: 6 6- r1c3 -3- r6c3 -8- r4c3 -9- r4c6 -1- r5c6 -6 => r1c6<>6
  29. Row 1 / Column 3 → 6 (Hidden Single)
  30. Finned X-Wing: 3 r18 c16 fr8c2 => r9c1<>3
  31. Hidden Pair: 3,9 in r9c48 => r9c4<>8
  32. Row 7 / Column 4 → 8 (Hidden Single)
  33. Row 3 / Column 2 → 8 (Hidden Single)
  34. Row 4 / Column 2 → 5 (Hidden Single)
  35. Row 4 / Column 7 → 2 (Naked Single)
  36. Row 5 / Column 1 → 4 (Naked Single)
  37. Row 4 / Column 4 → 4 (Naked Single)
  38. Row 6 / Column 7 → 8 (Naked Single)
  39. Row 5 / Column 4 → 6 (Naked Single)
  40. Row 1 / Column 7 → 4 (Naked Single)
  41. Row 4 / Column 8 → 1 (Naked Single)
  42. Row 6 / Column 3 → 3 (Naked Single)
  43. Row 2 / Column 4 → 3 (Naked Single)
  44. Row 5 / Column 6 → 1 (Naked Single)
  45. Row 1 / Column 8 → 8 (Naked Single)
  46. Row 8 / Column 7 → 6 (Naked Single)
  47. Row 9 / Column 7 → 5 (Full House)
  48. Row 4 / Column 6 → 9 (Naked Single)
  49. Row 4 / Column 3 → 8 (Full House)
  50. Row 6 / Column 4 → 2 (Full House)
  51. Row 9 / Column 4 → 9 (Full House)
  52. Row 8 / Column 6 → 3 (Full House)
  53. Row 6 / Column 8 → 9 (Naked Single)
  54. Row 6 / Column 2 → 1 (Full House)
  55. Row 5 / Column 3 → 9 (Full House)
  56. Row 2 / Column 3 → 1 (Full House)
  57. Row 5 / Column 9 → 5 (Full House)
  58. Row 1 / Column 6 → 2 (Naked Single)
  59. Row 1 / Column 1 → 3 (Full House)
  60. Row 3 / Column 6 → 6 (Full House)
  61. Row 9 / Column 9 → 8 (Naked Single)
  62. Row 8 / Column 9 → 9 (Full House)
  63. Row 9 / Column 8 → 3 (Naked Single)
  64. Row 7 / Column 8 → 4 (Full House)
  65. Row 7 / Column 2 → 3 (Full House)
  66. Row 8 / Column 1 → 8 (Naked Single)
  67. Row 8 / Column 2 → 4 (Full House)
  68. Row 9 / Column 2 → 6 (Full House)
  69. Row 9 / Column 1 → 1 (Full House)
  70. Row 2 / Column 1 → 5 (Naked Single)
  71. Row 2 / Column 8 → 6 (Full House)
  72. Row 3 / Column 8 → 5 (Full House)
  73. Row 3 / Column 1 → 2 (Full House)
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