Solution for Evil Sudoku #1386713524895

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

This Sudoku Puzzle has 66 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, Full House techniques.

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Solution Steps:

  1. Row 1 / Column 5 → 1 (Hidden Single)
  2. Row 1 / Column 3 → 4 (Hidden Single)
  3. Row 8 / Column 2 → 8 (Hidden Single)
  4. Row 8 / Column 5 → 7 (Hidden Single)
  5. Row 6 / Column 2 → 7 (Hidden Single)
  6. Row 9 / Column 1 → 7 (Hidden Single)
  7. Row 4 / Column 8 → 7 (Hidden Single)
  8. Row 3 / Column 9 → 7 (Hidden Single)
  9. Row 9 / Column 9 → 4 (Hidden Single)
  10. Locked Candidates Type 1 (Pointing): 5 in b1 => r5c1<>5
  11. Locked Candidates Type 1 (Pointing): 6 in b1 => r7c2<>6
  12. Locked Candidates Type 1 (Pointing): 1 in b6 => r9c7<>1
  13. Locked Candidates Type 2 (Claiming): 3 in r1 => r2c12,r3c2<>3
  14. Hidden Rectangle: 1/9 in r4c47,r6c47 => r6c7<>9
  15. Almost Locked Set XZ-Rule: A=r2c45678 {234569}, B=r23c2 {269}, X=6, Z=2,9 => r2c1<>2, r2c1<>9
  16. Row 2 / Column 1 → 5 (Naked Single)
  17. Row 3 / Column 6 → 5 (Hidden Single)
  18. Locked Candidates Type 2 (Claiming): 5 in c8 => r8c9<>5
  19. Naked Pair: 6,9 in r48c6 => r26c6<>9
  20. Discontinuous Nice Loop: 9 r7c5 -9- r8c6 -6- r4c6 =6= r5c5 =3= r6c6 =4= r6c4 -4- r7c4 =4= r7c5 => r7c5<>9
  21. Almost Locked Set XZ-Rule: A=r2c2456 {23469}, B=r23c8 {369}, X=6, Z=9 => r2c7<>9
  22. Almost Locked Set XZ-Rule: A=r2c2457 {23469}, B=r2c6 {34}, X=3,4 => r2c8,r3c5<>3, r2c8<>6, r2c8<>9
  23. Row 2 / Column 8 → 9 (Naked Single)
  24. Row 3 / Column 8 → 3 (Naked Single)
  25. Row 3 / Column 5 → 9 (Hidden Single)
  26. Row 3 / Column 2 → 2 (Naked Single)
  27. Row 3 / Column 7 → 4 (Full House)
  28. Row 2 / Column 2 → 6 (Naked Single)
  29. Row 2 / Column 7 → 2 (Naked Single)
  30. Row 2 / Column 4 → 4 (Naked Single)
  31. Row 2 / Column 5 → 3 (Full House)
  32. Row 2 / Column 6 → 3 (Full House)
  33. Row 5 / Column 5 → 6 (Naked Single)
  34. Row 6 / Column 6 → 4 (Naked Single)
  35. Row 4 / Column 6 → 9 (Naked Single)
  36. Row 4 / Column 4 → 1 (Full House)
  37. Row 6 / Column 4 → 1 (Full House)
  38. Row 9 / Column 5 → 2 (Naked Single)
  39. Row 7 / Column 5 → 4 (Full House)
  40. Row 4 / Column 3 → 2 (Naked Single)
  41. Row 8 / Column 6 → 6 (Naked Single)
  42. Row 6 / Column 7 → 5 (Naked Single)
  43. Row 4 / Column 1 → 8 (Naked Single)
  44. Row 4 / Column 7 → 6 (Full House)
  45. Row 1 / Column 7 → 6 (Naked Single)
  46. Row 5 / Column 9 → 9 (Naked Single)
  47. Row 6 / Column 9 → 9 (Naked Single)
  48. Row 9 / Column 7 → 9 (Naked Single)
  49. Row 1 / Column 9 → 5 (Naked Single)
  50. Row 5 / Column 1 → 3 (Naked Single)
  51. Row 5 / Column 7 → 8 (Naked Single)
  52. Row 5 / Column 3 → 5 (Full House)
  53. Row 6 / Column 3 → 3 (Full House)
  54. Row 8 / Column 9 → 2 (Naked Single)
  55. Row 1 / Column 1 → 9 (Naked Single)
  56. Row 1 / Column 2 → 3 (Full House)
  57. Row 7 / Column 1 → 2 (Full House)
  58. Row 7 / Column 2 → 9 (Full House)
  59. Row 7 / Column 3 → 6 (Naked Single)
  60. Row 7 / Column 4 → 5 (Full House)
  61. Row 8 / Column 3 → 1 (Full House)
  62. Row 7 / Column 8 → 5 (Full House)
  63. Row 9 / Column 3 → 1 (Full House)
  64. Row 8 / Column 4 → 9 (Full House)
  65. Row 8 / Column 8 → 5 (Full House)
  66. Row 9 / Column 8 → 6 (Naked Single)
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