Solution for Evil Sudoku #1347713524895

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

This Sudoku Puzzle has 65 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Naked Single, Locked Pair, Full House techniques.

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Solution Steps:

  1. Row 1 / Column 5 → 1 (Hidden Single)
  2. Row 4 / Column 8 → 7 (Hidden Single)
  3. Row 3 / Column 7 → 4 (Hidden Single)
  4. Row 9 / Column 5 → 7 (Hidden Single)
  5. Row 8 / Column 2 → 7 (Hidden Single)
  6. Row 7 / Column 2 → 8 (Hidden Single)
  7. Locked Candidates Type 1 (Pointing): 1 in b6 => r9c7<>1
  8. Locked Candidates Type 1 (Pointing): 8 in b8 => r8c9<>8
  9. Locked Candidates Type 2 (Claiming): 3 in r1 => r2c12,r3c2<>3
  10. Locked Candidates Type 2 (Claiming): 2 in c2 => r1c13,r2c1<>2
  11. Naked Triple: 1,6,9 in r4c46,r6c4 => r5c5,r6c6<>6, r5c5,r6c6<>9
  12. Row 5 / Column 5 → 3 (Naked Single)
  13. Row 6 / Column 6 → 3 (Naked Single)
  14. Row 2 / Column 8 → 3 (Hidden Single)
  15. Row 1 / Column 2 → 3 (Hidden Single)
  16. Row 7 / Column 1 → 3 (Hidden Single)
  17. Locked Candidates Type 2 (Claiming): 2 in r1 => r2c7,r3c9<>2
  18. Naked Triple: 5,6,9 in r1c13,r2c1 => r23c2<>6, r23c2<>9
  19. Row 2 / Column 2 → 2 (Naked Single)
  20. Row 3 / Column 2 → 2 (Naked Single)
  21. Row 6 / Column 2 → 6 (Hidden Single)
  22. Locked Pair: 6,9 in r23c5 => r2c46,r3c6,r78c5<>6, r2c46,r3c6,r78c5<>9
  23. Row 7 / Column 5 → 2 (Naked Single)
  24. Row 8 / Column 5 → 2 (Naked Single)
  25. Row 3 / Column 6 → 5 (Naked Single)
  26. Row 2 / Column 4 → 8 (Naked Single)
  27. Row 2 / Column 6 → 8 (Naked Single)
  28. Locked Pair: 6,9 in r3c89 => r1c79,r2c7,r3c5<>6, r1c79,r2c7,r3c5<>9
  29. Row 3 / Column 5 → 9 (Naked Single)
  30. Row 2 / Column 7 → 5 (Naked Single)
  31. Row 2 / Column 5 → 6 (Naked Single)
  32. Row 3 / Column 8 → 6 (Naked Single)
  33. Row 3 / Column 9 → 6 (Naked Single)
  34. Row 1 / Column 7 → 2 (Naked Single)
  35. Row 1 / Column 9 → 2 (Naked Single)
  36. Row 2 / Column 1 → 9 (Naked Single)
  37. Row 5 / Column 7 → 6 (Hidden Single)
  38. Locked Pair: 5,9 in r56c3 => r1c3,r5c1<>5, r4789c3<>9
  39. Row 1 / Column 3 → 6 (Naked Single)
  40. Row 4 / Column 3 → 2 (Naked Single)
  41. Row 7 / Column 3 → 6 (Naked Single)
  42. Row 5 / Column 1 → 8 (Naked Single)
  43. Row 1 / Column 1 → 5 (Naked Single)
  44. Row 8 / Column 3 → 1 (Naked Single)
  45. Row 4 / Column 1 → 8 (Naked Single)
  46. Row 9 / Column 3 → 1 (Naked Single)
  47. Row 9 / Column 1 → 2 (Naked Single)
  48. Row 9 / Column 8 → 9 (Naked Single)
  49. Row 7 / Column 8 → 5 (Full House)
  50. Row 8 / Column 8 → 5 (Full House)
  51. Row 8 / Column 9 → 5 (Naked Single)
  52. Row 9 / Column 7 → 8 (Naked Single)
  53. Row 9 / Column 9 → 8 (Naked Single)
  54. Row 7 / Column 4 → 9 (Naked Single)
  55. Row 5 / Column 9 → 9 (Naked Single)
  56. Row 4 / Column 7 → 1 (Full House)
  57. Row 5 / Column 3 → 5 (Full House)
  58. Row 6 / Column 7 → 1 (Full House)
  59. Row 6 / Column 9 → 9 (Naked Single)
  60. Row 6 / Column 4 → 1 (Naked Single)
  61. Row 8 / Column 4 → 6 (Naked Single)
  62. Row 8 / Column 6 → 6 (Naked Single)
  63. Row 4 / Column 4 → 6 (Naked Single)
  64. Row 6 / Column 3 → 9 (Naked Single)
  65. Row 4 / Column 6 → 9 (Naked Single)
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