Solution for Evil Sudoku #1189713524895

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

This Sudoku Puzzle has 67 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Hidden Rectangle, undefined, Naked Single, Naked Pair, Discontinuous Nice Loop, Locked Pair, Full House techniques.

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Solution Steps:

  1. Row 2 / Column 8 → 8 (Hidden Single)
  2. Row 9 / Column 5 → 1 (Hidden Single)
  3. Row 9 / Column 7 → 4 (Hidden Single)
  4. Row 2 / Column 5 → 7 (Hidden Single)
  5. Row 4 / Column 8 → 7 (Hidden Single)
  6. Row 1 / Column 9 → 7 (Hidden Single)
  7. Row 7 / Column 1 → 7 (Hidden Single)
  8. Row 6 / Column 2 → 7 (Hidden Single)
  9. Row 1 / Column 1 → 4 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 1 in b4 => r1c3<>1
  11. Locked Candidates Type 1 (Pointing): 5 in b9 => r5c9<>5
  12. Locked Candidates Type 1 (Pointing): 9 in b9 => r3c8<>9
  13. Locked Candidates Type 2 (Claiming): 3 in r9 => r78c8,r8c9<>3
  14. Hidden Rectangle: 1/6 in r4c36,r6c36 => r4c3<>6
  15. Almost Locked Set XZ-Rule: A=r8c23456 {234569}, B=r78c8 {269}, X=9, Z=2,6 => r8c9<>2, r8c9<>6
  16. Row 8 / Column 9 → 5 (Naked Single)
  17. Row 7 / Column 4 → 5 (Hidden Single)
  18. Locked Candidates Type 2 (Claiming): 5 in c2 => r2c1<>5
  19. Naked Pair: 6,9 in r26c4 => r48c4<>6
  20. Discontinuous Nice Loop: 6 r3c5 -6- r2c4 -9- r6c4 =9= r5c5 =3= r4c4 =4= r4c6 -4- r3c6 =4= r3c5 => r3c5<>6
  21. Almost Locked Set XZ-Rule: A=r8c2356 {23469}, B=r8c4 {34}, X=3,4 => r8c8<>2, r8c8<>6, r8c8,r9c13<>9
  22. Row 8 / Column 8 → 9 (Naked Single)
  23. Locked Pair: 3,6 in r78c2 => r123c2,r789c3,r9c1<>6
  24. Locked Pair: 2,4 in r78c3 => r19c3,r9c1<>2
  25. Row 9 / Column 3 → 5 (Naked Single)
  26. Row 9 / Column 1 → 5 (Naked Single)
  27. Row 4 / Column 3 → 1 (Naked Single)
  28. Row 4 / Column 1 → 6 (Naked Single)
  29. Row 4 / Column 6 → 4 (Naked Single)
  30. Row 5 / Column 1 → 9 (Naked Single)
  31. Row 5 / Column 3 → 8 (Full House)
  32. Row 6 / Column 3 → 8 (Full House)
  33. Row 4 / Column 4 → 3 (Naked Single)
  34. Row 4 / Column 7 → 5 (Full House)
  35. Row 2 / Column 1 → 2 (Naked Single)
  36. Row 5 / Column 5 → 6 (Naked Single)
  37. Row 5 / Column 7 → 3 (Full House)
  38. Row 5 / Column 9 → 3 (Full House)
  39. Row 8 / Column 4 → 4 (Naked Single)
  40. Row 6 / Column 4 → 9 (Naked Single)
  41. Row 6 / Column 6 → 1 (Full House)
  42. Row 2 / Column 4 → 6 (Full House)
  43. Row 8 / Column 3 → 2 (Naked Single)
  44. Row 2 / Column 6 → 5 (Naked Single)
  45. Row 7 / Column 3 → 4 (Naked Single)
  46. Row 8 / Column 5 → 3 (Naked Single)
  47. Row 8 / Column 6 → 6 (Naked Single)
  48. Row 3 / Column 6 → 2 (Full House)
  49. Row 7 / Column 5 → 2 (Full House)
  50. Row 8 / Column 2 → 6 (Naked Single)
  51. Row 1 / Column 5 → 9 (Naked Single)
  52. Row 3 / Column 5 → 4 (Full House)
  53. Row 3 / Column 9 → 6 (Naked Single)
  54. Row 7 / Column 8 → 6 (Naked Single)
  55. Row 7 / Column 2 → 3 (Full House)
  56. Row 1 / Column 2 → 1 (Naked Single)
  57. Row 1 / Column 3 → 6 (Naked Single)
  58. Row 1 / Column 7 → 2 (Full House)
  59. Row 3 / Column 7 → 9 (Naked Single)
  60. Row 3 / Column 8 → 3 (Naked Single)
  61. Row 2 / Column 7 → 1 (Full House)
  62. Row 2 / Column 2 → 9 (Full House)
  63. Row 6 / Column 7 → 6 (Full House)
  64. Row 3 / Column 2 → 5 (Full House)
  65. Row 6 / Column 9 → 2 (Naked Single)
  66. Row 9 / Column 9 → 2 (Naked Single)
  67. Row 9 / Column 8 → 2 (Naked Single)
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