Darkstone42
Oh.
Rule 41 - Boarding
41.1 Boarding – A boarding penalty shall be imposed on any player or goalkeeper who checks an opponent in such a manner that causes the opponent to be thrown violently in the boards. The severity of the penalty, based upon the degree of violence of the impact with the boards, shall be at the discretion of the Referee.
Was it a clean check? Yes. Did the check cause Wiercioch to be thrown violently into the boards? Yes. BOARDING.
Does it count if he slides on the ice for a few feet, though? Because he hit the ice first, and then slid into the boards.
In general, though, I don't like the wording of that rule. "Throw violently" is too subjective a term. What does "thrown" mean? What is too violent? That needs to be fixed.