Irish rugby is facing its biggest decision since the game turned professional in 1995. CVC Capital, the biggest private equity fund in Europe, is in talks to buy a 14 per cent stake in the Six Nations for up to €300 million. The deal would consolidate CVC’s power in the sport. It first showed up in 2018, seeking to buy stakes in rugby’s biggest tournaments for up-front cash. Premiership Rugby, the English club rugby tournament, was the first to do a deal. 27 per cent of the tournament was sold for €220 million in December 2018. Then in May of 2019,…