Re: (online) Seeking a rule for when is XX SOS

[...]
> 
> I'd much rather take the opposite approach:  a redouble is SOS only
> when we define it to be SOS.  Here are a couple of rules I think are
> unassailable:
> 
> (1) a redouble is SOS if and only if a takeout double has been
> converted into a penalty double by advancer.

I don't know what people are reading but to me "A if and only if B"
means "A is equivalent to B", i.e. that's all there is, and 
no Rule (2) can follow.   

Presumably you meant "A rdbl is always SOS if..." ?

> 
> (2)  a redouble is SOS of the "doubt showing" variety if they have
> made a penalty double of our freely bid game in a competitive auction.
> 

>[...] 

> An example of option two would be:
> 
> 1d (2c) 3c (p);
> 3d (p)   3h (p);
> 3s (p)   3nt (x);
> xx
> 
> Responder has shown a limit raise or better in diamonds; opener signed
> off with a minimum.  Responder showed heart cards, opener spade cards,
> and responder placed the contract.
> 
> Advancer's double calls for a club lead

But the doubler is on lead...

[...]