Solution for Evil Sudoku #4249728136541

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

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 → 7 (Naked Single)
  2. Row 7 / Column 5 → 3 (Naked Single)
  3. Row 8 / Column 5 → 2 (Naked Single)
  4. Row 2 / Column 5 → 6 (Full House)
  5. Row 4 / Column 6 → 6 (Hidden Single)
  6. Row 1 / Column 3 → 6 (Hidden Single)
  7. Row 9 / Column 9 → 6 (Hidden Single)
  8. Row 8 / Column 9 → 4 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 7 in b1 => r79c2<>7
  10. Locked Candidates Type 1 (Pointing): 4 in b8 => r6c6<>4
  11. Locked Candidates Type 1 (Pointing): 9 in b9 => r16c8<>9
  12. Locked Candidates Type 2 (Claiming): 5 in c9 => r1c78,r2c7,r3c8<>5
  13. Naked Triple: 3,5,8 in r6c368 => r6c24<>3, r6c27<>5, r6c2<>8
  14. Hidden Pair: 2,9 in r5c1,r6c2 => r5c1<>1, r5c1<>8
  15. 2-String Kite: 5 in r6c3,r9c7 (connected by r4c7,r6c8) => r9c3<>5
  16. Locked Candidates Type 2 (Claiming): 5 in c3 => r4c2<>5
  17. XY-Wing: 1/3/5 in r2c69,r3c4 => r3c9<>5
  18. Row 3 / Column 9 → 8 (Naked Single)
  19. XY-Chain: 5 5- r2c9 -3- r5c9 -9- r5c1 -2- r6c2 -9- r7c2 -5 => r2c2<>5
  20. AIC: 5 5- r7c2 -9- r6c2 =9= r6c7 =4= r4c7 =5= r9c7 -5 => r7c8,r9c12<>5
  21. Locked Pair: 7,9 in r78c8 => r19c8,r9c7<>7
  22. Continuous Nice Loop: 1/3/5/8 8= r1c2 =7= r1c7 =9= r1c9 =5= r2c9 =3= r2c6 -3- r6c6 -8- r6c8 =8= r4c8 -8- r4c2 =8= r1c2 =7 => r1c27<>1, r1c9,r5c6<>3, r1c2<>5, r46c3<>8
  23. Skyscraper: 3 in r5c9,r6c6 (connected by r2c69) => r5c4,r6c8<>3
  24. X-Wing: 3 c48 r14 => r4c23<>3
  25. Row 9 / Column 2 → 3 (Hidden Single)
  26. Sue de Coq: r4c78 - {13458} (r4c23 - {158}, r5c9,r6c7 - {349}) => r5c7<>9
  27. Row 5 / Column 7 → 1 (Naked Single)
  28. XY-Chain: 5 5- r1c9 -9- r1c7 -7- r2c7 -2- r3c8 -1- r3c4 -5 => r1c4<>5
  29. Row 3 / Column 4 → 5 (Hidden Single)
  30. Row 7 / Column 2 → 5 (Hidden Single)
  31. Row 6 / Column 2 → 9 (Hidden Single)
  32. Row 5 / Column 1 → 2 (Naked Single)
  33. Row 6 / Column 7 → 4 (Naked Single)
  34. Row 5 / Column 4 → 7 (Naked Single)
  35. Row 4 / Column 7 → 5 (Naked Single)
  36. Row 6 / Column 4 → 2 (Naked Single)
  37. Row 5 / Column 6 → 8 (Naked Single)
  38. Row 8 / Column 4 → 1 (Naked Single)
  39. Row 4 / Column 3 → 1 (Naked Single)
  40. Row 6 / Column 8 → 8 (Naked Single)
  41. Row 9 / Column 7 → 2 (Naked Single)
  42. Row 5 / Column 3 → 3 (Naked Single)
  43. Row 5 / Column 9 → 9 (Full House)
  44. Row 4 / Column 8 → 3 (Full House)
  45. Row 6 / Column 6 → 3 (Naked Single)
  46. Row 6 / Column 3 → 5 (Full House)
  47. Row 4 / Column 2 → 8 (Full House)
  48. Row 4 / Column 4 → 4 (Full House)
  49. Row 1 / Column 4 → 3 (Full House)
  50. Row 2 / Column 6 → 1 (Full House)
  51. Row 9 / Column 3 → 7 (Naked Single)
  52. Row 8 / Column 3 → 8 (Full House)
  53. Row 2 / Column 7 → 7 (Naked Single)
  54. Row 1 / Column 7 → 9 (Full House)
  55. Row 9 / Column 8 → 5 (Naked Single)
  56. Row 1 / Column 9 → 5 (Naked Single)
  57. Row 2 / Column 9 → 3 (Full House)
  58. Row 1 / Column 8 → 1 (Naked Single)
  59. Row 3 / Column 8 → 2 (Full House)
  60. Row 3 / Column 2 → 1 (Full House)
  61. Row 1 / Column 2 → 7 (Naked Single)
  62. Row 2 / Column 2 → 2 (Full House)
  63. Row 2 / Column 1 → 5 (Full House)
  64. Row 1 / Column 1 → 8 (Full House)
  65. Row 9 / Column 6 → 4 (Naked Single)
  66. Row 7 / Column 6 → 7 (Full House)
  67. Row 9 / Column 1 → 1 (Full House)
  68. Row 8 / Column 1 → 9 (Naked Single)
  69. Row 7 / Column 1 → 4 (Full House)
  70. Row 7 / Column 8 → 9 (Full House)
  71. Row 8 / Column 8 → 7 (Full House)
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