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....8......56.39...84...27..3.1...5.5...3...2.6...5.1..19...56...84.27......6....

It seems that you have done all the basics OK. That this point some chaining will be necessary. The one I've chosen below seems to be the most painless.

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*-----------------------------------------*
| 19  29 6  |c27  8   47  | 134  34   5   |
| 17  27 5  | 6  b24  3   | 9   a48   18  |
| 3   8  4  | 9   5   1   | 2    7    6   |
|-----------+-------------+---------------|
| 489 3  27 | 1   249 46  | 468  5    79  |
| 5   49 1  |d78  3   467 | 468  49-8 2   |
| 489 6  27 | 28  249 5   | 348  1    379 |
|-----------+-------------+---------------|
| 2   1  9  | 3   7   8   | 5    6    4   |
| 6   5  8  | 4   1   2   | 7    39   39  |
| 47  47 3  | 5   6   9   | 18   2    18  |
*-----------------------------------------*

An XY chain of length 4 in cells a-b-c-d will solve the puzzle.

Leren

Cheers!