Sagitt

Although it could be overcalled with 2♦ in the beginning, it is very necessary to ask what the 2♥ bid is..If it is a real suit I would double to show the other suits and then my partner can decide what to do. The silence after the 1♠ bid can be compensated this way. But my way is to overcall as 2♦ then to bid 3♣ if possible..

To me It does depend on the agreement with yr partner. I use double after an opening bid to show 12hcp+ # of cards of the opponents suit. So if 1♦ is the opening bid and if I have 3 cards ♦ I shld have 12+3=15hcp in order to be able to double. I use it with my regular partner. Or if you agree with your p that an overcall is 8-17 hcp that will be an overcall.

I fely myself very sad. A very big loss , also for Turkish bridge community..