You're not "supposed" to play with 10 players. However, if someone gets injured, and you don't want to substitute them, you can play with 10 players. (You only get 3 subs so if someone can play again in 3 minutes it would be a waste of a sub). Also, if someone gets two yellows (equalling a red card), you lose a player. Any red card and you lose a player from your team, making you have one less player for the match. Hope that answers your question.
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