Solution for Evil Sudoku #2426438971541

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

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 → 4 (Naked Single)
  2. Row 7 / Column 5 → 7 (Naked Single)
  3. Row 8 / Column 5 → 3 (Naked Single)
  4. Row 2 / Column 5 → 1 (Full House)
  5. Row 4 / Column 4 → 1 (Hidden Single)
  6. Row 1 / Column 7 → 1 (Hidden Single)
  7. Row 9 / Column 1 → 1 (Hidden Single)
  8. Row 8 / Column 1 → 2 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 4 in b3 => r79c8<>4
  10. Locked Candidates Type 1 (Pointing): 6 in b7 => r16c2<>6
  11. Locked Candidates Type 1 (Pointing): 2 in b8 => r6c4<>2
  12. Locked Candidates Type 2 (Claiming): 5 in c1 => r1c23,r2c3,r3c2<>5
  13. Naked Triple: 5,7,8 in r6c247 => r6c38<>5, r6c68<>7, r6c8<>8
  14. Hidden Pair: 3,6 in r5c9,r6c8 => r5c9<>8, r5c9<>9
  15. 2-String Kite: 5 in r6c7,r9c3 (connected by r4c3,r6c2) => r9c7<>5
  16. Locked Candidates Type 2 (Claiming): 5 in c7 => r4c8<>5
  17. XY-Wing: 7/9/5 in r2c14,r3c6 => r3c1<>5
  18. Row 3 / Column 1 → 8 (Naked Single)
  19. XY-Chain: 5 5- r2c1 -7- r5c1 -6- r5c9 -3- r6c8 -6- r7c8 -5 => r2c8<>5
  20. AIC: 5 5- r7c8 -6- r6c8 =6= r6c3 =2= r4c3 =5= r9c3 -5 => r7c2,r9c89<>5
  21. Locked Pair: 4,6 in r78c2 => r19c2,r9c3<>4
  22. Continuous Nice Loop: 5/7/8/9 6= r1c1 =5= r2c1 =7= r2c4 -7- r6c4 -8- r6c2 =8= r4c2 -8- r4c8 =8= r1c8 =4= r1c3 =6= r1c1 =5 => r1c8<>5, r1c1,r5c4<>7, r46c7<>8, r1c38<>9
  23. Skyscraper: 7 in r5c1,r6c4 (connected by r2c14) => r5c6,r6c2<>7
  24. X-Wing: 7 c26 r14 => r4c78<>7
  25. Row 9 / Column 8 → 7 (Hidden Single)
  26. Sue de Coq: r4c23 - {25789} (r4c78 - {589}, r5c1,r6c3 - {267}) => r5c3<>6
  27. Row 5 / Column 3 → 9 (Naked Single)
  28. XY-Chain: 5 5- r1c1 -6- r1c3 -4- r2c3 -3- r3c2 -9- r3c6 -5 => r1c6<>5
  29. Row 3 / Column 6 → 5 (Hidden Single)
  30. Row 7 / Column 8 → 5 (Hidden Single)
  31. Row 6 / Column 8 → 6 (Hidden Single)
  32. Row 5 / Column 9 → 3 (Naked Single)
  33. Row 6 / Column 3 → 2 (Naked Single)
  34. Row 5 / Column 6 → 4 (Naked Single)
  35. Row 4 / Column 3 → 5 (Naked Single)
  36. Row 6 / Column 6 → 3 (Naked Single)
  37. Row 5 / Column 4 → 8 (Naked Single)
  38. Row 8 / Column 6 → 9 (Naked Single)
  39. Row 4 / Column 7 → 9 (Naked Single)
  40. Row 6 / Column 2 → 8 (Naked Single)
  41. Row 9 / Column 3 → 3 (Naked Single)
  42. Row 5 / Column 7 → 7 (Naked Single)
  43. Row 5 / Column 1 → 6 (Full House)
  44. Row 4 / Column 2 → 7 (Full House)
  45. Row 6 / Column 4 → 7 (Naked Single)
  46. Row 6 / Column 7 → 5 (Full House)
  47. Row 4 / Column 8 → 8 (Full House)
  48. Row 4 / Column 6 → 2 (Full House)
  49. Row 1 / Column 6 → 7 (Full House)
  50. Row 2 / Column 4 → 9 (Full House)
  51. Row 9 / Column 7 → 4 (Naked Single)
  52. Row 8 / Column 7 → 8 (Full House)
  53. Row 2 / Column 3 → 4 (Naked Single)
  54. Row 1 / Column 3 → 6 (Full House)
  55. Row 9 / Column 2 → 5 (Naked Single)
  56. Row 1 / Column 1 → 5 (Naked Single)
  57. Row 2 / Column 1 → 7 (Full House)
  58. Row 1 / Column 2 → 9 (Naked Single)
  59. Row 3 / Column 2 → 3 (Full House)
  60. Row 3 / Column 8 → 9 (Full House)
  61. Row 1 / Column 8 → 4 (Naked Single)
  62. Row 2 / Column 8 → 3 (Full House)
  63. Row 2 / Column 9 → 5 (Full House)
  64. Row 1 / Column 9 → 8 (Full House)
  65. Row 9 / Column 4 → 2 (Naked Single)
  66. Row 7 / Column 4 → 4 (Full House)
  67. Row 9 / Column 9 → 9 (Full House)
  68. Row 8 / Column 9 → 6 (Naked Single)
  69. Row 7 / Column 9 → 2 (Full House)
  70. Row 7 / Column 2 → 6 (Full House)
  71. Row 8 / Column 2 → 4 (Full House)
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