As is the case with almost every Arsenal game Mikel Arteta faces right now, Tuesday’s clash with Chelsea is monumentally important. Saturday’s hard-fought win in the Midlands felt as if it handed some confidence and control back to Mikel Arteta and his team, ahead of the difficult tasks to come. And although Chelsea aren’t enjoying a fruitful first season under Mauricio Pochettino, form can often go out of the window in derbies. Arsenal will obviously hope that they’ve become too reliable and strong to fall down on that basis, but stranger things have happened. Similarly, on paper Arsenal shou…