Where once this was a Liverpool team who were the Premier League’s worst performing from set-pieces, there has been a radical transformation since the turn of the year that has put them among the very best. The first three goals against West Ham were all the direct result of corners and, in the case of Cody Gakpo’s fourth, one that was recycled soon after. Arne Slot’s players still struggle to defend them, but in this case they could rely on West Ham being even more erratic than the home team when it came to getting organised. Liverpool are still making mistakes – just not as many as this opponent. It would be unfair to blame the early-season form on the departure of coach Aaron Briggs, formerly responsible for Liverpool set-pieces – but something has changed. A fourth straight win since the defeat by Manchester City on February 8 takes Liverpool level on points with fourth-placed Manchester United, but it was still an anxious afternoon at Anfield for much of it. Nuno Espírito Santo’s team had …