Thanks for the suggestions, gentlemen! We haven't tried Go, Raddy--I'll put it on the list. And thanks for the link to the other variants, lucounu (he's been trying to talk me into learning Alice and Ultima so that he can beat me at those, too--but now I see that there are dozens of others--oh my, oh my; software might be just the ticket for getting mum off the hook...)

Your last link made me laugh, lucounu.

Thanks again to you both,
minnie