How do you find the good diamond slam when partner opens 1S? Only one pair did – Martin Andresen and Geir Helgemo.
Helgemo opened 1S, opps overcalled 3C, Andresen bid 3D which was a good start!

1S – (3C) – 3D – (4C)
5D – (P) – 5NT* – (P)
6D!
* pick a slam