Solution for Evil Sudoku #4338196527441

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

This Sudoku Puzzle has 71 steps and it is solved using Naked Single, Full House, Hidden Single, Locked Candidates Type 1 (Pointing), Locked Candidates Type 2 (Claiming), Naked Triple, Hidden Pair, undefined, AIC, Locked Pair, Continuous Nice Loop, Skyscraper, Sue de Coq techniques.

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Solution Steps:

  1. Row 5 / Column 7 → 1 (Naked Single)
  2. Row 5 / Column 2 → 9 (Naked Single)
  3. Row 5 / Column 3 → 2 (Naked Single)
  4. Row 5 / Column 8 → 7 (Full House)
  5. Row 3 / Column 9 → 7 (Hidden Single)
  6. Row 6 / Column 6 → 7 (Hidden Single)
  7. Row 9 / Column 1 → 7 (Hidden Single)
  8. Row 9 / Column 2 → 3 (Hidden Single)
  9. Locked Candidates Type 1 (Pointing): 1 in b3 => r2c13<>1
  10. Locked Candidates Type 1 (Pointing): 3 in b4 => r6c4<>3
  11. Locked Candidates Type 1 (Pointing): 8 in b7 => r8c49<>8
  12. Locked Candidates Type 2 (Claiming): 4 in r9 => r7c89,r8c79<>4
  13. Naked Triple: 2,4,6 in r368c4 => r24c4<>2, r27c4<>4, r2c4<>6
  14. Hidden Pair: 8,9 in r1c5,r2c4 => r1c5<>5, r1c5<>6
  15. 2-String Kite: 4 in r3c4,r7c1 (connected by r7c6,r8c4) => r3c1<>4
  16. Locked Candidates Type 2 (Claiming): 4 in r3 => r2c6<>4
  17. XY-Wing: 2/5/4 in r4c7,r69c8 => r9c7<>4
  18. Row 9 / Column 7 → 6 (Naked Single)
  19. XY-Chain: 4 4- r2c3 -8- r2c4 -9- r1c5 -8- r9c5 -2- r9c8 -4 => r2c8<>4
  20. AIC: 4 4- r2c3 -8- r2c4 =8= r7c4 =3= r7c6 =4= r7c1 -4 => r12c1,r8c3<>4
  21. Locked Pair: 1,8 in r8c23 => r78c1,r8c9<>1
  22. Continuous Nice Loop: 2/4/5/6 1= r2c9 =6= r2c6 -6- r8c6 =6= r8c4 -6- r6c4 -2- r6c8 =2= r9c8 =4= r9c9 =8= r7c9 =1= r2c9 =6 => r6c5,r9c9<>2, r2c9<>4, r27c9<>5, r3c46<>6
  23. Skyscraper: 2 in r6c4,r9c5 (connected by r69c8) => r4c5,r8c4<>2
  24. X-Wing: 2 r48 c69 => r23c6<>2
  25. Row 2 / Column 1 → 2 (Hidden Single)
  26. Sue de Coq: r78c6 - {23456} (r23c6 - {456}, r7c4,r9c5 - {238}) => r7c5<>8
  27. Row 7 / Column 5 → 5 (Naked Single)
  28. XY-Chain: 9 9- r1c5 -8- r9c5 -2- r9c8 -4- r9c9 -8- r7c9 -1- r7c8 -9 => r1c8<>9
  29. Row 1 / Column 5 → 9 (Hidden Single)
  30. Row 2 / Column 4 → 8 (Naked Single)
  31. Row 4 / Column 5 → 1 (Naked Single)
  32. Row 2 / Column 3 → 4 (Naked Single)
  33. Row 7 / Column 4 → 3 (Naked Single)
  34. Row 4 / Column 2 → 5 (Naked Single)
  35. Row 6 / Column 5 → 6 (Naked Single)
  36. Row 4 / Column 4 → 9 (Naked Single)
  37. Row 7 / Column 6 → 4 (Naked Single)
  38. Row 4 / Column 7 → 4 (Naked Single)
  39. Row 3 / Column 5 → 2 (Naked Single)
  40. Row 9 / Column 5 → 8 (Full House)
  41. Row 6 / Column 4 → 2 (Naked Single)
  42. Row 4 / Column 6 → 3 (Full House)
  43. Row 4 / Column 9 → 2 (Full House)
  44. Row 6 / Column 8 → 5 (Full House)
  45. Row 3 / Column 6 → 5 (Naked Single)
  46. Row 7 / Column 1 → 9 (Naked Single)
  47. Row 8 / Column 4 → 6 (Naked Single)
  48. Row 3 / Column 4 → 4 (Full House)
  49. Row 2 / Column 6 → 6 (Full House)
  50. Row 8 / Column 6 → 2 (Full House)
  51. Row 9 / Column 9 → 4 (Naked Single)
  52. Row 9 / Column 8 → 2 (Full House)
  53. Row 8 / Column 9 → 5 (Naked Single)
  54. Row 1 / Column 8 → 4 (Naked Single)
  55. Row 3 / Column 1 → 1 (Naked Single)
  56. Row 3 / Column 2 → 6 (Full House)
  57. Row 7 / Column 8 → 1 (Naked Single)
  58. Row 2 / Column 8 → 9 (Full House)
  59. Row 7 / Column 9 → 8 (Full House)
  60. Row 8 / Column 7 → 9 (Full House)
  61. Row 2 / Column 7 → 5 (Full House)
  62. Row 2 / Column 9 → 1 (Full House)
  63. Row 1 / Column 9 → 6 (Full House)
  64. Row 8 / Column 1 → 4 (Naked Single)
  65. Row 6 / Column 1 → 3 (Naked Single)
  66. Row 1 / Column 1 → 5 (Full House)
  67. Row 6 / Column 3 → 1 (Full House)
  68. Row 1 / Column 2 → 8 (Naked Single)
  69. Row 1 / Column 3 → 3 (Full House)
  70. Row 8 / Column 3 → 8 (Full House)
  71. Row 8 / Column 2 → 1 (Full House)
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