Solution for Evil Sudoku #1274713524895

1
8
3
4
2
7
7
3
7
7
4
2
5
8
7
1
7
3
7
8
1
4
1
4
5
4

This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Pair, Full House, Naked Single, Locked Candidates Type 2 (Claiming) techniques.

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Solution Steps:

  1. Row 2 / Column 4 → 7 (Hidden Single)
  2. Row 5 / Column 1 → 1 (Hidden Single)
  3. Row 3 / Column 2 → 4 (Hidden Single)
  4. Row 7 / Column 1 → 4 (Hidden Single)
  5. Row 8 / Column 6 → 7 (Hidden Single)
  6. Row 5 / Column 7 → 4 (Hidden Single)
  7. Row 1 / Column 9 → 4 (Hidden Single)
  8. Locked Candidates Type 1 (Pointing): 1 in b2 => r3c9<>1
  9. Locked Candidates Type 1 (Pointing): 5 in b7 => r9c5<>5
  10. Locked Candidates Type 1 (Pointing): 8 in b8 => r9c79<>8
  11. Row 3 / Column 9 → 8 (Hidden Single)
  12. Row 1 / Column 5 → 8 (Hidden Single)
  13. Row 9 / Column 4 → 8 (Hidden Single)
  14. Row 1 / Column 8 → 2 (Hidden Single)
  15. Row 7 / Column 4 → 2 (Hidden Single)
  16. Locked Candidates Type 1 (Pointing): 5 in b3 => r2c23<>5
  17. Locked Candidates Type 1 (Pointing): 6 in b3 => r2c23<>6
  18. Locked Pair: 3,9 in r2c23 => r1c13,r2c789,r3c13<>9
  19. Row 1 / Column 6 → 9 (Hidden Single)
  20. Locked Candidates Type 1 (Pointing): 5 in b2 => r3c13<>5
  21. Locked Pair: 2,6 in r3c13 => r1c13,r3c456<>6
  22. Row 1 / Column 1 → 5 (Full House)
  23. Row 1 / Column 3 → 5 (Full House)
  24. Row 3 / Column 4 → 1 (Naked Single)
  25. Row 3 / Column 5 → 5 (Full House)
  26. Row 3 / Column 6 → 5 (Full House)
  27. Row 9 / Column 2 → 5 (Hidden Single)
  28. Row 6 / Column 6 → 1 (Hidden Single)
  29. Row 4 / Column 8 → 5 (Hidden Single)
  30. Row 2 / Column 7 → 5 (Hidden Single)
  31. Row 4 / Column 2 → 8 (Hidden Single)
  32. Locked Candidates Type 1 (Pointing): 9 in b8 => r5c5<>9
  33. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23<>3
  34. Locked Candidates Type 2 (Claiming): 9 in c1 => r8c23<>9
  35. Locked Pair: 2,6 in r8c23 => r8c17,r9c1<>2, r8c178,r9c1<>6
  36. Row 3 / Column 1 → 2 (Hidden Single)
  37. Row 3 / Column 3 → 6 (Naked Single)
  38. Row 8 / Column 3 → 2 (Naked Single)
  39. Row 8 / Column 2 → 6 (Naked Single)
  40. Locked Pair: 3,9 in r45c3 => r2c3,r5c2<>3, r2c3,r56c2<>9
  41. Row 2 / Column 3 → 9 (Naked Single)
  42. Row 5 / Column 2 → 2 (Naked Single)
  43. Row 6 / Column 2 → 2 (Naked Single)
  44. Row 2 / Column 2 → 3 (Naked Single)
  45. Row 4 / Column 3 → 3 (Naked Single)
  46. Row 5 / Column 3 → 3 (Naked Single)
  47. Row 4 / Column 6 → 6 (Naked Single)
  48. Row 4 / Column 4 → 9 (Full House)
  49. Row 6 / Column 4 → 9 (Full House)
  50. Row 5 / Column 5 → 6 (Naked Single)
  51. Row 7 / Column 6 → 3 (Naked Single)
  52. Row 7 / Column 5 → 9 (Full House)
  53. Row 9 / Column 5 → 9 (Full House)
  54. Row 5 / Column 8 → 9 (Naked Single)
  55. Row 5 / Column 9 → 9 (Naked Single)
  56. Row 7 / Column 7 → 6 (Naked Single)
  57. Row 7 / Column 8 → 1 (Full House)
  58. Row 7 / Column 9 → 1 (Full House)
  59. Row 2 / Column 8 → 6 (Full House)
  60. Row 8 / Column 8 → 8 (Full House)
  61. Row 2 / Column 9 → 6 (Full House)
  62. Row 6 / Column 8 → 8 (Full House)
  63. Row 9 / Column 1 → 3 (Naked Single)
  64. Row 8 / Column 1 → 9 (Full House)
  65. Row 8 / Column 7 → 3 (Full House)
  66. Row 6 / Column 7 → 8 (Naked Single)
  67. Row 9 / Column 9 → 2 (Naked Single)
  68. Row 9 / Column 7 → 2 (Naked Single)
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