Not played by my rules but..
In my family, you have to play the trump "life" card if you have one and another one had been thrown.
For example:
If the life is gold, and I throw a old first, the computer would then have to throw a gold if it had it. At first I thought this was the case, so I thought that the computer would have no gold. However it did, and won a lot of points from my folly.
It is still a great game!