Checking the bulletin from 3rd Open European Ch in Turkey today I came across this one from the mixed R32 match. You have:
The auction went pass from RHO, pass by you and 3S from LHO (Soulet) and partner X's for takeout. You are red against white, what would be your choice?
Espen Erichsen chose 3NT and made it after some discomfort (missguessing clubs) on a high spade lead for +600 on this layout.
This was a 10 imp gain when a modest 2S-opening by Tor Helness at the other table was passed out for -150. Excellent off-shape takeout X of 3S by the way with a doubleton heart ;-)
If you played the Marston 3NT takeout reply convention, you would have passed 3S X, probably cursing the convention, and collected +800.
Another way to win with a convention; when it prevents you from choosing a bid that would lead to a lesser score. Funny game.
I'm leaving for Turkey myself tomorrow. Play starts Friday for Open teams and we're on team Apteker if you want to check up on us. I'll try to post everyday if I can find Internet access without too much hassle.