In futsal, it is illegal to tackle an opponent. This seems kind of broad to me. Tackling is the act of dispossessing an opponent of the ball. So, if a player takes the ball away from an opponent, without any contact, would this be illegal?
USSF answer (January 27, 2012):
That portion of futsal rules changed 2 years ago. It is generally like outdoor soccer, the difference being that in futsal contact with an opponent before contact with the ball is not allowed unless the referee feels the contact was inadvertent when both were playing for the ball. An outdoor-style shoulder charge is a no no. The same standards of careless, reckless, or use of excessive force are applied as in outdoor soccer.