Solution for Evil Sudoku #1157713524895

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

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

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Solution Steps:

  1. Row 6 / Column 2 → 7 (Hidden Single)
  2. Row 9 / Column 5 → 1 (Hidden Single)
  3. Row 1 / Column 5 → 7 (Hidden Single)
  4. Row 2 / Column 8 → 7 (Hidden Single)
  5. Row 9 / Column 7 → 4 (Hidden Single)
  6. Row 8 / Column 9 → 5 (Hidden Single)
  7. Row 3 / Column 8 → 8 (Hidden Single)
  8. Row 7 / Column 2 → 5 (Hidden Single)
  9. Row 8 / Column 2 → 3 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 8 in b2 => r2c1<>8
  11. Locked Candidates Type 1 (Pointing): 1 in b4 => r1c3<>1
  12. Locked Candidates Type 1 (Pointing): 3 in b8 => r7c8<>3
  13. Locked Candidates Type 2 (Claiming): 6 in c2 => r1c13,r2c1<>6
  14. Locked Candidates Type 2 (Claiming): 9 in c2 => r1c13,r2c1<>9
  15. Row 2 / Column 1 → 2 (Naked Single)
  16. Locked Triple: 6,8,9 in r2c456 => r2c27,r3c56<>6, r2c27,r3c56<>9
  17. Row 2 / Column 2 → 1 (Naked Single)
  18. Row 2 / Column 7 → 1 (Naked Single)
  19. Locked Candidates Type 1 (Pointing): 2 in b2 => r3c79<>2
  20. Locked Candidates Type 2 (Claiming): 2 in c8 => r9c9<>2
  21. Naked Pair: 6,9 in r49c1 => r57c1<>6, r57c1<>9
  22. Row 5 / Column 1 → 8 (Naked Single)
  23. Row 7 / Column 1 → 4 (Naked Single)
  24. Row 1 / Column 1 → 4 (Naked Single)
  25. Row 1 / Column 3 → 8 (Naked Single)
  26. Row 6 / Column 9 → 8 (Hidden Single)
  27. Row 6 / Column 7 → 2 (Hidden Single)
  28. Row 1 / Column 9 → 2 (Hidden Single)
  29. Locked Triple: 2,6,9 in r789c3 => r456c3,r9c1<>6, r456c3,r9c1<>9
  30. Row 5 / Column 3 → 5 (Naked Single)
  31. Row 6 / Column 3 → 1 (Naked Single)
  32. Row 9 / Column 1 → 9 (Naked Single)
  33. Row 4 / Column 3 → 1 (Naked Single)
  34. Row 4 / Column 1 → 6 (Naked Single)
  35. Row 4 / Column 7 → 5 (Hidden Single)
  36. Locked Candidates Type 1 (Pointing): 6 in b6 => r5c5<>6
  37. Locked Candidates Type 1 (Pointing): 9 in b9 => r4c8<>9
  38. Row 4 / Column 8 → 3 (Naked Single)
  39. Row 7 / Column 4 → 3 (Hidden Single)
  40. Row 5 / Column 5 → 3 (Hidden Single)
  41. Row 3 / Column 7 → 3 (Hidden Single)
  42. Row 9 / Column 9 → 3 (Hidden Single)
  43. Locked Candidates Type 2 (Claiming): 9 in r4 => r6c46<>9
  44. Row 6 / Column 4 → 6 (Full House)
  45. Row 6 / Column 6 → 6 (Full House)
  46. Row 2 / Column 5 → 6 (Hidden Single)
  47. Locked Candidates Type 2 (Claiming): 9 in c5 => r8c46<>9
  48. Naked Pair: 2,6 in r78c3 => r9c3<>2, r9c3<>6
  49. Row 9 / Column 3 → 6 (Naked Single)
  50. Row 7 / Column 3 → 2 (Naked Single)
  51. Row 8 / Column 3 → 2 (Naked Single)
  52. Row 9 / Column 8 → 2 (Naked Single)
  53. Row 7 / Column 5 → 9 (Naked Single)
  54. Row 7 / Column 8 → 6 (Full House)
  55. Row 8 / Column 8 → 9 (Full House)
  56. Row 8 / Column 5 → 4 (Naked Single)
  57. Row 3 / Column 5 → 2 (Full House)
  58. Row 8 / Column 4 → 8 (Full House)
  59. Row 8 / Column 6 → 8 (Full House)
  60. Row 3 / Column 6 → 4 (Naked Single)
  61. Row 2 / Column 4 → 9 (Full House)
  62. Row 2 / Column 6 → 9 (Full House)
  63. Row 4 / Column 4 → 4 (Full House)
  64. Row 4 / Column 6 → 9 (Naked Single)
  65. Give Up: Don't know how to proceed!
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