These not mine either but one of our players bid like this and I was trying to determine if there was any sense to it or whether some (including me) were missing something.. I think the very first comment summed it up well
"I think it means that the 3C ...
Hi All - thanks for your comments. I, too, thought the auction was impossible but wanted to make sure that I hadn't missed something. Your discussions confirmed that and I appreciate them. My partner held AQJxx, Ax, AKxxxx, X. Once he doubled he didn't know how to catch up ...
You're at the table, partner has made this bid and then 3S.
So you pick up and go home?? ;) You can't abstain. I guess you can pass 3D if that's what you want to do? Or would you prefer to decide after partner bids 3S?
I think opener's pass should be treated as if he re-bid 1NT and whatever system you play should apply. if auction went 1C - P - 1H - P
1NT - P - 2D … New Minor, XYX, whatever assume
opener had re-bid 1NT