There are few in the Chelsea squad who think about football facts and figures more deeply than Petr Cech and the significance of Chelsea's 'big four' success this season is not lost upon him.
The Liverpool win made it six out of six against this season's Champions League-qualified teams - the first time in the Premier League era that either ourselves, Arsenal, Manchester United or Liverpool have enjoyed a clean sweep over the other three.
It is certainly a contrast to last season when we won just one of the corresponding games - away to Arsenal. The other five yielded a home draw to Manchester United and four defeats.
'So far the biggest difference to last season is that,' acknowledges Cech.
'We have won all of those games home and away. Last season, before the change of the manager we gave points to our rivals.'