[ad_1] This penultimate London derby of 2020, the oldest in the top flight and the 202nd between the two teams, pits fifth-placed Chelsea against host Arsenal, currently 15th in the Premier League and winless in 55 days. It is the Blues' fourth appearance in the campaign in the time slot Saturday at 5.30pm, which has turned out to be reasonably happy, with no losses so far.Christmas games usually mark the middle of the Premier League campaign, but not in this unprecedented campaign. With only 14 of the 38 games counted, the midpoint has shifted to mid-January.However, we can still strike a reasonable balance, and although Chelsea's long unbeaten streak was halted with successive losses away from home, a 3-0 win last time at home to West Ham was an efficient finishing exercise, and that may be crucial against an Arsenal side with former blue Willian in their ranks.The Gunners' difficulties are well documented. In terms of points, this is their weakest start since 1974/75, and the current score of 0.86 goals per game is their worst result in 108 years, when they suffered relegation. [ad_2]