gnasher, on 2013-September-28, 14:48, said:
The conclusion is correct, but I think the maths is wrong.
Also I think, West has 6 pointed suit cards not seven, so I was doubly wrong. I agree that to get the odds one adds in the diamonds. So the odds are 8:6 before a diamond is played, and, as you say, 7:4 after three small diamonds are played.