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1

This Sudoku Puzzle has 36 steps and it is solved using Hidden Single, Locked Candidates Type 1 (Pointing), Hidden Triple, Skyscraper, undefined, AIC, Naked Single, Empty Rectangle, Naked Pair, Continuous Nice Loop, Hidden Pair, Full House, Hidden Rectangle, Give Up techniques.

Naked Single Explanation
Hidden Single Explanation
Hidden Pair Explanation
Locked Candidates Explanation
Full House Explanation
Try To Solve This Puzzle

Solution Steps:

  1. Row 1 / Column 9 → 9 (Hidden Single)
  2. Row 1 / Column 5 → 5 (Hidden Single)
  3. Row 9 / Column 3 → 5 (Hidden Single)
  4. Locked Candidates Type 1 (Pointing): 4 in b3 => r3c124<>4
  5. Locked Candidates Type 1 (Pointing): 4 in b6 => r5c46<>4
  6. Locked Candidates Type 1 (Pointing): 1 in b8 => r8c2<>1
  7. Hidden Triple: 4,5,7 in r5c679 => r5c6<>1, r5c6<>9, r5c7<>8, r5c9<>6
  8. Skyscraper: 4 in r1c4,r9c5 (connected by r19c2) => r2c5,r8c4<>4
  9. W-Wing: 2/8 in r3c4,r4c1 connected by 8 in r34c7 => r3c1<>2
  10. AIC: 8 8- r1c8 -2- r2c8 =2= r2c1 -2- r4c1 -8- r4c7 =8= r3c7 =4= r3c9 =6= r3c2 -6- r2c3 -8 => r1c23,r2c8<>8
  11. Row 1 / Column 3 → 3 (Naked Single)
  12. Row 7 / Column 3 → 1 (Naked Single)
  13. Empty Rectangle: 8 in b2 (r25c3) => r5c4<>8
  14. Naked Pair: 1,9 in r58c4 => r6c4<>1, r6c4<>9
  15. Continuous Nice Loop: 6/7/8 2= r4c2 =1= r4c6 =5= r4c7 =8= r3c7 -8- r1c8 -2- r2c8 =2= r2c1 -2- r4c1 =2= r4c2 =1 => r4c2<>6, r4c6<>7, r4c2<>8
  16. Hidden Pair: 6,7 in r4c59 => r4c5<>8
  17. Locked Candidates Type 1 (Pointing): 8 in b5 => r6c28<>8
  18. XY-Chain: 1 1- r4c2 -2- r4c1 -8- r4c7 -5- r5c7 -4- r5c9 -7- r4c9 -6- r6c8 -1 => r6c2<>1
  19. AIC: 2 2- r1c2 -4- r1c4 =4= r6c4 =8= r6c5 =6= r4c5 -6- r4c9 =6= r3c9 -6- r2c8 -2 => r1c8,r2c1<>2
  20. Row 1 / Column 8 → 8 (Naked Single)
  21. Row 3 / Column 7 → 4 (Naked Single)
  22. Row 3 / Column 9 → 6 (Naked Single)
  23. Row 2 / Column 8 → 2 (Full House)
  24. Row 5 / Column 7 → 5 (Naked Single)
  25. Row 4 / Column 7 → 8 (Full House)
  26. Row 4 / Column 9 → 7 (Naked Single)
  27. Row 5 / Column 9 → 4 (Full House)
  28. Row 5 / Column 6 → 7 (Naked Single)
  29. Row 4 / Column 1 → 2 (Naked Single)
  30. Row 4 / Column 5 → 6 (Naked Single)
  31. Row 4 / Column 2 → 1 (Naked Single)
  32. Row 4 / Column 6 → 5 (Full House)
  33. Row 2 / Column 3 → 6 (Hidden Single)
  34. Row 5 / Column 3 → 8 (Full House)
  35. Hidden Rectangle: 7/8 in r3c12,r8c12 => r8c2<>7
  36. Give Up: Don't know how to proceed!
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