The thing is, my mother, who is very old, would very much like to play bridge on the internet, but having grown up with rubber bridge, and having played it all her life, she cannot imagine playing anything else. She really, really does not like the IMP way of scoring. For her it is like a dead fish. I do not share her sentiment but I understand it. In rubber bridge you build on what went down so far, whereas in IMP pairs every hand stands for itself, not in real life, but on BBO where it's common not to reset scores once a player leaves. So ultimately the IMP's often mean very little. Not so with rubber bridge, I think it would be a welcome addition. So why does it not exist?