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LONDON — Chelsea won but that was only part of the story on a thoroughly unpleasant afternoon at the Tottenham Hotspur Stadium. After Son Heung-min was sent off 17 minutes into the second half, a bottle was thrown from the crowd at the Chelsea goalkeeper Kepa Arrizabalaga and a racist insult was aimed at Antonio Rudiger, leading to a warning about racism being relayed over the public address system. Two further announcements followed before the end of the game. Exactly what the racism consisted of or how many fans were involved remains unclear, but there will be an investigation.