Solution for Evil Sudoku #1437214598692

3
8
7
9
6
5
7
1
8
5
8
5
3
9
1
2
6
4
2
9
8
8
1
2

This Sudoku Puzzle has 70 steps and it is solved using Hidden Single, Locked Pair, Naked Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Full House, Naked Pair techniques.

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Solution Steps:

  1. Row 2 / Column 4 → 8 (Hidden Single)
  2. Row 9 / Column 2 → 8 (Hidden Single)
  3. Row 4 / Column 1 → 3 (Hidden Single)
  4. Row 5 / Column 7 → 3 (Hidden Single)
  5. Row 6 / Column 1 → 7 (Hidden Single)
  6. Locked Pair: 4,6 in r6c78 => r4c79,r6c269<>4, r4c79,r6c239<>6
  7. Row 6 / Column 9 → 8 (Naked Single)
  8. Row 4 / Column 6 → 8 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 3 in b2 => r789c4<>3
  10. Locked Candidates Type 1 (Pointing): 4 in b4 => r12c2<>4
  11. Locked Candidates Type 1 (Pointing): 1 in b5 => r4c23<>1
  12. Locked Candidates Type 1 (Pointing): 7 in b6 => r4c45<>7
  13. Locked Candidates Type 1 (Pointing): 9 in b9 => r7c46<>9
  14. Locked Candidates Type 2 (Claiming): 1 in c1 => r1c23,r2c2<>1
  15. Locked Pair: 2,5 in r1c23 => r1c47,r2c2,r3c3<>2, r1c79,r3c3<>5
  16. Row 2 / Column 7 → 2 (Hidden Single)
  17. Row 2 / Column 1 → 1 (Hidden Single)
  18. Row 1 / Column 1 → 4 (Full House)
  19. Row 1 / Column 4 → 3 (Naked Single)
  20. Row 1 / Column 9 → 7 (Naked Single)
  21. Row 1 / Column 7 → 1 (Naked Single)
  22. Row 4 / Column 9 → 5 (Naked Single)
  23. Row 4 / Column 7 → 7 (Naked Single)
  24. Locked Candidates Type 1 (Pointing): 4 in b2 => r3c789<>4
  25. Naked Pair: 4,6 in r26c8 => r38c8<>6, r8c8<>4
  26. Locked Candidates Type 1 (Pointing): 4 in b9 => r9c456<>4
  27. Locked Candidates Type 1 (Pointing): 6 in b9 => r9c45<>6
  28. Locked Pair: 1,7 in r9c45 => r7c4,r9c3<>1, r78c4,r8c5,r9c3<>7
  29. Row 9 / Column 3 → 5 (Naked Single)
  30. Row 7 / Column 4 → 2 (Naked Single)
  31. Row 1 / Column 3 → 2 (Naked Single)
  32. Row 1 / Column 2 → 5 (Full House)
  33. Row 8 / Column 2 → 3 (Naked Single)
  34. Row 8 / Column 3 → 7 (Naked Single)
  35. Row 7 / Column 2 → 1 (Full House)
  36. Row 9 / Column 6 → 3 (Naked Single)
  37. Row 3 / Column 4 → 4 (Naked Single)
  38. Row 3 / Column 5 → 2 (Full House)
  39. Row 4 / Column 3 → 6 (Naked Single)
  40. Row 8 / Column 8 → 5 (Naked Single)
  41. Row 7 / Column 6 → 5 (Naked Single)
  42. Row 3 / Column 3 → 9 (Naked Single)
  43. Row 2 / Column 2 → 6 (Full House)
  44. Row 6 / Column 3 → 1 (Full House)
  45. Row 4 / Column 4 → 1 (Naked Single)
  46. Row 3 / Column 8 → 3 (Naked Single)
  47. Row 7 / Column 7 → 9 (Naked Single)
  48. Row 2 / Column 8 → 4 (Naked Single)
  49. Row 2 / Column 9 → 9 (Full House)
  50. Row 4 / Column 5 → 4 (Naked Single)
  51. Row 4 / Column 2 → 2 (Full House)
  52. Row 9 / Column 4 → 7 (Naked Single)
  53. Row 3 / Column 9 → 6 (Naked Single)
  54. Row 3 / Column 7 → 5 (Full House)
  55. Row 7 / Column 8 → 7 (Naked Single)
  56. Row 7 / Column 9 → 3 (Full House)
  57. Row 6 / Column 8 → 6 (Full House)
  58. Row 9 / Column 9 → 4 (Full House)
  59. Row 6 / Column 7 → 4 (Full House)
  60. Row 9 / Column 7 → 6 (Full House)
  61. Row 9 / Column 5 → 1 (Full House)
  62. Row 5 / Column 6 → 9 (Naked Single)
  63. Row 8 / Column 5 → 6 (Naked Single)
  64. Row 5 / Column 5 → 7 (Full House)
  65. Row 6 / Column 2 → 9 (Naked Single)
  66. Row 5 / Column 2 → 4 (Full House)
  67. Row 5 / Column 4 → 6 (Full House)
  68. Row 6 / Column 6 → 2 (Full House)
  69. Row 8 / Column 6 → 4 (Full House)
  70. Row 8 / Column 4 → 9 (Full House)
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