Solution for Evil Sudoku #1377713524895

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

This Sudoku Puzzle has 68 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Pair, Locked Pair, Naked Single, 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 1 / Column 3 → 4 (Hidden Single)
  4. Row 8 / Column 2 → 7 (Hidden Single)
  5. Row 7 / Column 2 → 8 (Hidden Single)
  6. Locked Candidates Type 1 (Pointing): 5 in b1 => r5c1<>5
  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 1 (Pointing): 4 in b9 => r9c5<>4
  10. Locked Candidates Type 2 (Claiming): 3 in r1 => r2c12,r3c2<>3
  11. Locked Candidates Type 2 (Claiming): 2 in c2 => r12c1<>2
  12. Hidden Pair: 4,8 in r9c79 => r9c79<>2, r9c79<>6, r9c79<>9
  13. Row 8 / Column 9 → 2 (Hidden Single)
  14. Locked Candidates Type 1 (Pointing): 5 in b9 => r23c8<>5
  15. Locked Candidates Type 1 (Pointing): 6 in b9 => r23c8<>6
  16. Locked Pair: 3,9 in r23c8 => r1c79,r23c7,r3c9,r789c8<>9
  17. Locked Candidates Type 2 (Claiming): 9 in r1 => r2c12,r3c2<>9
  18. Locked Pair: 2,6 in r23c2 => r1c2<>2, r1c12,r2c1,r6c2<>6
  19. Row 2 / Column 1 → 5 (Naked Single)
  20. Row 1 / Column 7 → 2 (Hidden Single)
  21. Row 3 / Column 6 → 5 (Hidden Single)
  22. Row 1 / Column 9 → 5 (Hidden Single)
  23. Locked Pair: 4,6 in r23c7 => r3c9,r456c7<>6, r3c9,r9c7<>4
  24. Row 9 / Column 7 → 8 (Naked Single)
  25. Row 3 / Column 9 → 6 (Naked Single)
  26. Row 9 / Column 9 → 4 (Naked Single)
  27. Row 2 / Column 7 → 4 (Naked Single)
  28. Row 3 / Column 2 → 2 (Naked Single)
  29. Row 3 / Column 7 → 4 (Naked Single)
  30. Row 6 / Column 9 → 9 (Naked Single)
  31. Row 2 / Column 2 → 6 (Naked Single)
  32. Row 4 / Column 7 → 1 (Naked Single)
  33. Row 5 / Column 7 → 5 (Naked Single)
  34. Row 5 / Column 9 → 8 (Naked Single)
  35. Row 6 / Column 7 → 5 (Full House)
  36. Row 6 / Column 2 → 3 (Naked Single)
  37. Row 1 / Column 2 → 9 (Full House)
  38. Row 1 / Column 1 → 3 (Full House)
  39. Row 6 / Column 3 → 6 (Naked Single)
  40. Row 5 / Column 1 → 9 (Naked Single)
  41. Row 5 / Column 3 → 9 (Naked Single)
  42. Row 6 / Column 6 → 4 (Naked Single)
  43. Row 4 / Column 3 → 2 (Naked Single)
  44. Row 8 / Column 3 → 1 (Naked Single)
  45. Row 6 / Column 4 → 1 (Naked Single)
  46. Row 4 / Column 1 → 8 (Naked Single)
  47. Row 7 / Column 3 → 3 (Naked Single)
  48. Row 9 / Column 3 → 1 (Naked Single)
  49. Row 9 / Column 8 → 6 (Naked Single)
  50. Row 7 / Column 8 → 5 (Full House)
  51. Row 8 / Column 8 → 5 (Full House)
  52. Row 9 / Column 1 → 2 (Naked Single)
  53. Row 7 / Column 1 → 6 (Full House)
  54. Row 9 / Column 5 → 9 (Naked Single)
  55. Row 3 / Column 5 → 3 (Naked Single)
  56. Row 8 / Column 5 → 6 (Naked Single)
  57. Row 2 / Column 5 → 2 (Naked Single)
  58. Row 3 / Column 8 → 9 (Naked Single)
  59. Row 5 / Column 5 → 6 (Naked Single)
  60. Row 4 / Column 4 → 9 (Full House)
  61. Row 4 / Column 6 → 9 (Full House)
  62. Row 2 / Column 4 → 8 (Full House)
  63. Row 2 / Column 6 → 8 (Full House)
  64. Row 8 / Column 4 → 8 (Naked Single)
  65. Row 8 / Column 6 → 8 (Naked Single)
  66. Row 7 / Column 5 → 4 (Naked Single)
  67. Row 7 / Column 4 → 2 (Full House)
  68. Row 2 / Column 8 → 3 (Naked Single)
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