The 5th International Chess Festival “Yaroslav the Wise” features a double round robin tournament of six European Chess Champions in the period 2009-2014.
The participants are: Alexander Motylev (European champion in 2014), Alexander Moiseenko (2013), Dmitry Jakovenko (2012), Vladimir Potkin (2011), Ian Nepomniachtchi (2010) and Evgeny Tomashevsky (2009).
More information here