Here's a quick overview of tyre strategy for the Monaco Grand Prix. The chart show s the lap by lap position of each car, along with tyre strategy. Tyre choice is given by node colour (I know, I need to add a legend:-( and node size gives the number of stops. Note the change of tyres without increasing the the number of stops during the red flag period at the end of the race.
Tyre data obtained from Pirelli: Vettel claims Monaco victory after thrilling three-way fight