Solution for Evil Sudoku #2475361248941

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

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 3 / Column 5 → 3 (Naked Single)
  2. Row 7 / Column 5 → 4 (Naked Single)
  3. Row 8 / Column 5 → 6 (Naked Single)
  4. Row 2 / Column 5 → 8 (Full House)
  5. Row 4 / Column 4 → 8 (Hidden Single)
  6. Row 1 / Column 7 → 8 (Hidden Single)
  7. Row 9 / Column 1 → 8 (Hidden Single)
  8. Row 8 / Column 1 → 7 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 3 in b3 => r79c8<>3
  10. Locked Candidates Type 1 (Pointing): 5 in b7 => r16c2<>5
  11. Locked Candidates Type 1 (Pointing): 7 in b8 => r6c4<>7
  12. Locked Candidates Type 2 (Claiming): 9 in c1 => r1c23,r2c3,r3c2<>9
  13. Naked Triple: 1,4,9 in r6c247 => r6c38<>9, r6c68<>4, r6c8<>1
  14. Hidden Pair: 5,6 in r5c9,r6c8 => r5c9<>1, r5c9<>2
  15. 2-String Kite: 9 in r6c7,r9c3 (connected by r4c3,r6c2) => r9c7<>9
  16. Locked Candidates Type 2 (Claiming): 9 in c7 => r4c8<>9
  17. XY-Wing: 2/4/9 in r2c14,r3c6 => r3c1<>9
  18. Row 3 / Column 1 → 1 (Naked Single)
  19. XY-Chain: 9 9- r2c1 -4- r5c1 -5- r5c9 -6- r6c8 -5- r7c8 -9 => r2c8<>9
  20. AIC: 9 9- r7c8 -5- r6c8 =5= r6c3 =7= r4c3 =9= r9c3 -9 => r7c2,r9c89<>9
  21. Locked Pair: 3,5 in r78c2 => r19c2,r9c3<>3
  22. Continuous Nice Loop: 1/2/4/9 9= r1c1 =5= r1c3 =3= r1c8 =1= r4c8 -1- r4c2 =1= r6c2 -1- r6c4 -4- r2c4 =4= r2c1 =9= r1c1 =5 => r46c7<>1, r1c38<>2, r1c1,r5c4<>4, r1c8<>9
  23. Skyscraper: 4 in r5c1,r6c4 (connected by r2c14) => r5c6,r6c2<>4
  24. X-Wing: 4 c26 r14 => r4c78<>4
  25. Row 9 / Column 8 → 4 (Hidden Single)
  26. Sue de Coq: r4c23 - {12479} (r4c78 - {129}, r5c1,r6c3 - {457}) => r5c3<>5
  27. Row 5 / Column 3 → 2 (Naked Single)
  28. XY-Chain: 9 9- r1c1 -5- r1c3 -3- r2c3 -6- r3c2 -2- r3c6 -9 => r1c6<>9
  29. Row 3 / Column 6 → 9 (Hidden Single)
  30. Row 7 / Column 8 → 9 (Hidden Single)
  31. Row 6 / Column 8 → 5 (Hidden Single)
  32. Row 5 / Column 9 → 6 (Naked Single)
  33. Row 6 / Column 3 → 7 (Naked Single)
  34. Row 5 / Column 6 → 3 (Naked Single)
  35. Row 4 / Column 3 → 9 (Naked Single)
  36. Row 6 / Column 6 → 6 (Naked Single)
  37. Row 5 / Column 4 → 1 (Naked Single)
  38. Row 8 / Column 6 → 2 (Naked Single)
  39. Row 4 / Column 7 → 2 (Naked Single)
  40. Row 6 / Column 2 → 1 (Naked Single)
  41. Row 9 / Column 3 → 6 (Naked Single)
  42. Row 5 / Column 7 → 4 (Naked Single)
  43. Row 5 / Column 1 → 5 (Full House)
  44. Row 4 / Column 2 → 4 (Full House)
  45. Row 6 / Column 4 → 4 (Naked Single)
  46. Row 6 / Column 7 → 9 (Full House)
  47. Row 4 / Column 8 → 1 (Full House)
  48. Row 4 / Column 6 → 7 (Full House)
  49. Row 1 / Column 6 → 4 (Full House)
  50. Row 2 / Column 4 → 2 (Full House)
  51. Row 9 / Column 7 → 3 (Naked Single)
  52. Row 8 / Column 7 → 1 (Full House)
  53. Row 2 / Column 3 → 3 (Naked Single)
  54. Row 1 / Column 3 → 5 (Full House)
  55. Row 9 / Column 2 → 9 (Naked Single)
  56. Row 1 / Column 1 → 9 (Naked Single)
  57. Row 2 / Column 1 → 4 (Full House)
  58. Row 1 / Column 2 → 2 (Naked Single)
  59. Row 3 / Column 2 → 6 (Full House)
  60. Row 3 / Column 8 → 2 (Full House)
  61. Row 1 / Column 8 → 3 (Naked Single)
  62. Row 2 / Column 8 → 6 (Full House)
  63. Row 2 / Column 9 → 9 (Full House)
  64. Row 1 / Column 9 → 1 (Full House)
  65. Row 9 / Column 4 → 7 (Naked Single)
  66. Row 7 / Column 4 → 3 (Full House)
  67. Row 9 / Column 9 → 2 (Full House)
  68. Row 8 / Column 9 → 5 (Naked Single)
  69. Row 7 / Column 9 → 7 (Full House)
  70. Row 7 / Column 2 → 5 (Full House)
  71. Row 8 / Column 2 → 3 (Full House)
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