[fix #10] Euen.10.sse

[fix #10] Euen.10.sse
I'm pretty sure we'll need more information than just that text. Let's at least send a column number, in a json object. Something like:
```json
{"column": 3}
```

In fact, I would add the match status to that, like…
```json
{"column": 3, "match_status": "on_course"} /* if the game still goes on */
{"column": 3, "match_status": "lost"} /* if the listener lost the game */
{"column": 3, "match_status": "drawn"} /* if the match was drawn */
```