Handball is almost completely subjective. It is written that way purposely so attackers can't hunt for handballs by just smashing it against arms. And also it's impossible to determine someone's intention. At this point it is basically ruled by convention. Convention says you can't score with your hand.
There are others instances of convention that are accepted, that are not in the rules. For example, "hands away from the body". When you're challenging something like a cross with your hands way out, it may not be intentional handball, but you know the ball could hit your hand. So referees have adopted that "rule" as their own at this point.
There are others instances of convention that are accepted, that are not in the rules. For example, "hands away from the body". When you're challenging something like a cross with your hands way out, it may not be intentional handball, but you know the ball could hit your hand. So referees have adopted that "rule" as their own at this point.
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