Harold and I play the following:
• Double shows at least 4 cards in both majors
• 1NT is takeout showing at least 4 cards in both minors
• 1D and 1H are natural and show 6 card suits (or very good 5 card suits)
• 1S show 0-3 spades but is non forcing
• All jump bids are natural and weak.
All subsequent bids by responder are natural and jump bids are pre-emptive
Can anyone confirm whether it's legal to use 1S in this way (or at the very least, what sticker would it be in international events)? I remember getting a couple of good scores with it playing in 1S* in 5-2 and 5-3 fits. Of course, also one howler when I bid it; they doubled; partner redoubled with a good six card suit and then I pulled it into a 2 level 4-2 fit thinking it was SOS
PS I would bid 5D with that hand Alex as 4NT would be RKCB and double would be penalty in my system. It's a bit of a guess but probably your best shot. What were the actual hands?