According to the Sun the pair have gotten seriously competitive about their chess, Monopoly and Scrabble. They even invite fellow cast members like Taylor Lautner, Kellan Lutz and Ashley Greene join them.
The Sun's source said "Rob and Kristen have hours to burn on set and have got massively into board games. It gets competitive. There have been tantrums over snakes and ladders
Let's hope there are no black eyes over chess then. Filming is expected up to four months!