In GP4 I had a quick race at Monaco (bumped the distance up to around 15 laps). It started dry, so started on grooves, but the forcast was of torrential rain to start immediately. It got very wet, very quickly, and after 3 laps, some cars pitted for wets. With 2-3 laps to go, most of the remaining cars on drys pitted for monsoon tyres, but a couple of AI cars, and myself, stayed on the slicks.
Was bloody hard going, with no aids, but I think I finished 2nd to Coulthard - so, so rewarding :D