Solution for Evil Sudoku #1142713524895

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

This Sudoku Puzzle has 63 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Single, Locked Pair, Full House techniques.

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Solution Steps:

  1. Row 9 / Column 5 → 1 (Hidden Single)
  2. Row 7 / Column 3 → 4 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 8 in b6 => r13c9<>8
  4. Locked Candidates Type 2 (Claiming): 8 in r1 => r2c1<>8
  5. Locked Candidates Type 2 (Claiming): 3 in r9 => r78c8,r8c9<>3
  6. Naked Pair: 6,9 in r6c47 => r6c2369<>6, r6c2369<>9
  7. Row 6 / Column 6 → 1 (Naked Single)
  8. Row 6 / Column 2 → 7 (Naked Single)
  9. Row 6 / Column 3 → 8 (Naked Single)
  10. Row 6 / Column 9 → 8 (Naked Single)
  11. Row 4 / Column 3 → 1 (Hidden Single)
  12. Row 4 / Column 8 → 7 (Hidden Single)
  13. Row 7 / Column 1 → 7 (Hidden Single)
  14. Row 1 / Column 9 → 7 (Hidden Single)
  15. Row 1 / Column 1 → 8 (Hidden Single)
  16. Row 2 / Column 5 → 7 (Hidden Single)
  17. Naked Pair: 6,9 in r4c6,r6c4 => r4c4,r5c5<>6, r4c4,r5c5<>9
  18. Row 4 / Column 4 → 3 (Naked Single)
  19. Row 5 / Column 5 → 3 (Naked Single)
  20. Row 7 / Column 2 → 3 (Hidden Single)
  21. Row 7 / Column 4 → 5 (Hidden Single)
  22. Locked Pair: 6,9 in r78c5 => r13c5,r8c46<>6, r13c5,r8c46<>9
  23. Row 1 / Column 5 → 2 (Naked Single)
  24. Row 3 / Column 5 → 2 (Naked Single)
  25. Row 8 / Column 4 → 8 (Naked Single)
  26. Row 8 / Column 6 → 8 (Naked Single)
  27. Row 2 / Column 1 → 2 (Hidden Single)
  28. Row 2 / Column 8 → 8 (Hidden Single)
  29. Row 9 / Column 7 → 2 (Hidden Single)
  30. Row 8 / Column 3 → 2 (Hidden Single)
  31. Row 3 / Column 7 → 3 (Hidden Single)
  32. Row 9 / Column 8 → 3 (Hidden Single)
  33. Locked Pair: 6,9 in r3c89 => r12c7,r3c26<>6, r12c7,r3c26<>9
  34. Row 3 / Column 2 → 5 (Naked Single)
  35. Row 3 / Column 6 → 5 (Naked Single)
  36. Row 1 / Column 7 → 1 (Naked Single)
  37. Row 2 / Column 7 → 1 (Naked Single)
  38. Row 8 / Column 9 → 5 (Hidden Single)
  39. Locked Pair: 6,9 in r12c2 => r1c3,r8c2<>6, r1c3,r8c2<>9
  40. Row 8 / Column 2 → 9 (Naked Single)
  41. Row 1 / Column 3 → 9 (Naked Single)
  42. Row 1 / Column 2 → 6 (Naked Single)
  43. Row 2 / Column 2 → 6 (Naked Single)
  44. Row 8 / Column 5 → 6 (Naked Single)
  45. Row 8 / Column 8 → 6 (Naked Single)
  46. Row 7 / Column 5 → 9 (Full House)
  47. Row 7 / Column 8 → 9 (Full House)
  48. Row 2 / Column 4 → 9 (Naked Single)
  49. Row 6 / Column 4 → 6 (Full House)
  50. Row 2 / Column 6 → 9 (Naked Single)
  51. Row 3 / Column 8 → 9 (Naked Single)
  52. Row 9 / Column 9 → 9 (Naked Single)
  53. Row 4 / Column 6 → 9 (Naked Single)
  54. Row 6 / Column 7 → 9 (Naked Single)
  55. Row 3 / Column 9 → 6 (Naked Single)
  56. Row 5 / Column 9 → 6 (Naked Single)
  57. Row 4 / Column 7 → 5 (Naked Single)
  58. Row 5 / Column 3 → 5 (Naked Single)
  59. Row 5 / Column 7 → 5 (Naked Single)
  60. Row 4 / Column 1 → 6 (Naked Single)
  61. Row 5 / Column 1 → 9 (Full House)
  62. Row 9 / Column 1 → 5 (Full House)
  63. Row 9 / Column 3 → 6 (Naked Single)
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