Solution for Evil Sudoku #1342713524895

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

This Sudoku Puzzle has 64 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Pair, Naked Single, Locked Pair, Locked Triple, Full House techniques.

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Solution Steps:

  1. Row 1 / Column 5 → 1 (Hidden Single)
  2. Row 3 / Column 7 → 4 (Hidden Single)
  3. Locked Candidates Type 1 (Pointing): 8 in b4 => r79c1<>8
  4. Locked Candidates Type 2 (Claiming): 3 in r1 => r2c12,r3c2<>3
  5. Locked Candidates Type 2 (Claiming): 8 in r9 => r8c9<>8
  6. Naked Pair: 6,9 in r4c36 => r4c1478<>6, r4c1478<>9
  7. Row 4 / Column 4 → 1 (Naked Single)
  8. Row 4 / Column 7 → 8 (Naked Single)
  9. Row 4 / Column 8 → 7 (Naked Single)
  10. Row 4 / Column 1 → 7 (Naked Single)
  11. Row 6 / Column 7 → 1 (Hidden Single)
  12. Row 5 / Column 1 → 8 (Hidden Single)
  13. Row 9 / Column 9 → 8 (Hidden Single)
  14. Row 3 / Column 9 → 7 (Hidden Single)
  15. Row 8 / Column 2 → 7 (Hidden Single)
  16. Row 9 / Column 5 → 7 (Hidden Single)
  17. Row 7 / Column 2 → 8 (Hidden Single)
  18. Locked Candidates Type 1 (Pointing): 5 in b4 => r1c3<>5
  19. Locked Candidates Type 1 (Pointing): 2 in b7 => r1c3<>2
  20. Naked Pair: 6,9 in r4c6,r6c4 => r5c5,r6c6<>6, r5c5,r6c6<>9
  21. Row 5 / Column 5 → 3 (Naked Single)
  22. Row 6 / Column 6 → 3 (Naked Single)
  23. Row 2 / Column 8 → 3 (Hidden Single)
  24. Row 1 / Column 2 → 3 (Hidden Single)
  25. Row 7 / Column 1 → 3 (Hidden Single)
  26. Row 2 / Column 2 → 2 (Hidden Single)
  27. Locked Pair: 6,9 in r23c5 => r2c46,r3c6,r78c5<>6, r2c46,r3c6,r78c5<>9
  28. Row 7 / Column 5 → 2 (Naked Single)
  29. Row 8 / Column 5 → 2 (Naked Single)
  30. Row 3 / Column 6 → 5 (Naked Single)
  31. Row 2 / Column 4 → 8 (Naked Single)
  32. Row 2 / Column 6 → 8 (Naked Single)
  33. Row 9 / Column 3 → 2 (Hidden Single)
  34. Row 1 / Column 9 → 2 (Hidden Single)
  35. Row 9 / Column 8 → 1 (Hidden Single)
  36. Row 8 / Column 3 → 1 (Hidden Single)
  37. Locked Triple: 5,6,9 in r456c3 => r17c3,r6c2<>6, r17c3,r6c2<>9
  38. Row 1 / Column 3 → 9 (Naked Single)
  39. Row 7 / Column 3 → 9 (Naked Single)
  40. Row 6 / Column 2 → 9 (Naked Single)
  41. Row 3 / Column 2 → 6 (Naked Single)
  42. Row 3 / Column 5 → 9 (Full House)
  43. Row 3 / Column 8 → 9 (Full House)
  44. Row 4 / Column 3 → 6 (Naked Single)
  45. Row 9 / Column 1 → 6 (Naked Single)
  46. Row 9 / Column 7 → 9 (Full House)
  47. Row 6 / Column 4 → 6 (Naked Single)
  48. Row 1 / Column 1 → 5 (Naked Single)
  49. Row 2 / Column 1 → 5 (Naked Single)
  50. Row 2 / Column 5 → 6 (Naked Single)
  51. Row 4 / Column 6 → 9 (Naked Single)
  52. Row 5 / Column 3 → 5 (Naked Single)
  53. Row 1 / Column 7 → 6 (Full House)
  54. Row 2 / Column 7 → 6 (Full House)
  55. Row 5 / Column 7 → 6 (Full House)
  56. Row 6 / Column 3 → 5 (Naked Single)
  57. Row 6 / Column 9 → 5 (Naked Single)
  58. Row 7 / Column 4 → 5 (Naked Single)
  59. Row 8 / Column 4 → 9 (Full House)
  60. Row 8 / Column 6 → 6 (Naked Single)
  61. Row 5 / Column 9 → 9 (Naked Single)
  62. Row 8 / Column 9 → 6 (Naked Single)
  63. Row 7 / Column 8 → 6 (Naked Single)
  64. Row 8 / Column 8 → 5 (Naked Single)
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