Solution for Evil Sudoku #1289713524895

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

This Sudoku Puzzle has 68 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 8 / Column 8 → 8 (Hidden Single)
  2. Row 5 / Column 1 → 1 (Hidden Single)
  3. Row 7 / Column 1 → 4 (Hidden Single)
  4. Row 8 / Column 6 → 7 (Hidden Single)
  5. Row 5 / Column 8 → 7 (Hidden Single)
  6. Row 9 / Column 9 → 7 (Hidden Single)
  7. Row 1 / Column 3 → 7 (Hidden Single)
  8. Row 2 / Column 4 → 7 (Hidden Single)
  9. Row 1 / Column 9 → 4 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 1 in b2 => r3c9<>1
  11. Locked Candidates Type 1 (Pointing): 5 in b7 => r9c5<>5
  12. Locked Candidates Type 1 (Pointing): 9 in b7 => r8c7<>9
  13. Locked Candidates Type 2 (Claiming): 3 in c1 => r8c23,r9c2<>3
  14. Hidden Rectangle: 1/6 in r3c46,r6c46 => r3c6<>6
  15. Almost Locked Set XZ-Rule: A=r8c23 {269}, B=r23456c2 {234569}, X=9, Z=2,6 => r9c2<>2, r9c2<>6
  16. Row 9 / Column 2 → 5 (Naked Single)
  17. Row 4 / Column 3 → 5 (Hidden Single)
  18. Locked Candidates Type 2 (Claiming): 5 in r2 => r1c8<>5
  19. Naked Pair: 6,9 in r4c48 => r4c26<>6
  20. Discontinuous Nice Loop: 6 r5c7 -6- r4c8 -9- r4c4 =9= r5c5 =3= r4c6 =4= r6c6 -4- r6c7 =4= r5c7 => r5c7<>6
  21. Almost Locked Set XZ-Rule: A=r2c23 {369}, B=r4568c2 {23469}, X=9, Z=6 => r3c2<>6
  22. Almost Locked Set XZ-Rule: A=r4c2 {34}, B=r2356c2 {23469}, X=3,4 => r8c2<>2, r8c2<>6, r13c1,r8c2<>9
  23. Row 8 / Column 2 → 9 (Naked Single)
  24. Locked Pair: 3,6 in r2c23 => r13c1,r2c789,r3c3<>6
  25. Locked Pair: 2,5 in r13c1 => r3c23,r89c1<>2
  26. Row 3 / Column 2 → 4 (Naked Single)
  27. Row 3 / Column 3 → 4 (Naked Single)
  28. Row 4 / Column 2 → 3 (Naked Single)
  29. Row 2 / Column 2 → 6 (Naked Single)
  30. Row 4 / Column 6 → 4 (Naked Single)
  31. Row 2 / Column 3 → 3 (Naked Single)
  32. Row 5 / Column 2 → 2 (Naked Single)
  33. Row 6 / Column 2 → 2 (Naked Single)
  34. Row 5 / Column 3 → 6 (Naked Single)
  35. Row 5 / Column 9 → 9 (Naked Single)
  36. Row 8 / Column 3 → 2 (Naked Single)
  37. Row 2 / Column 9 → 1 (Naked Single)
  38. Row 4 / Column 8 → 6 (Naked Single)
  39. Row 4 / Column 4 → 9 (Full House)
  40. Row 5 / Column 5 → 3 (Naked Single)
  41. Row 5 / Column 7 → 4 (Full House)
  42. Row 6 / Column 8 → 5 (Full House)
  43. Row 6 / Column 7 → 5 (Full House)
  44. Row 2 / Column 8 → 9 (Full House)
  45. Row 2 / Column 7 → 9 (Full House)
  46. Row 1 / Column 8 → 2 (Naked Single)
  47. Row 7 / Column 8 → 1 (Full House)
  48. Row 1 / Column 1 → 5 (Naked Single)
  49. Row 3 / Column 9 → 6 (Naked Single)
  50. Row 7 / Column 9 → 2 (Full House)
  51. Row 1 / Column 6 → 6 (Naked Single)
  52. Row 1 / Column 5 → 9 (Full House)
  53. Row 3 / Column 1 → 2 (Naked Single)
  54. Row 7 / Column 4 → 6 (Naked Single)
  55. Row 6 / Column 6 → 1 (Full House)
  56. Row 6 / Column 4 → 1 (Full House)
  57. Row 7 / Column 5 → 5 (Naked Single)
  58. Row 7 / Column 7 → 3 (Full House)
  59. Row 9 / Column 5 → 8 (Full House)
  60. Row 3 / Column 5 → 8 (Full House)
  61. Row 7 / Column 6 → 3 (Full House)
  62. Row 8 / Column 7 → 6 (Full House)
  63. Row 9 / Column 7 → 6 (Full House)
  64. Row 8 / Column 1 → 3 (Full House)
  65. Row 9 / Column 1 → 3 (Full House)
  66. Row 3 / Column 6 → 5 (Naked Single)
  67. Row 3 / Column 4 → 8 (Full House)
  68. Row 9 / Column 4 → 2 (Naked Single)
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