Since everyone ITT will know more about hockey than me, this is the first in a series of questions. Some answers will be opinion as I'll try not to ask questions that can be googlyed.
What is it that makes a hit clean, and how does it differ from a dirty hit? I know a lot of infractions are subjective calls.
A dirty hit is generally any hit with attempt to injure or that could result in an injury.
Coming up high (or worse leaving his feet) on a hit so that your shoulder hits the guys head is a big one. Any hit to the head is considered dirty.
In general a dirty hit is excessive, or takes advantage of a player when he is vulnerable and not expecting to be hit.
A lot of dirty hits are late hits, a player has his guy lined up for a hit, his guy makes a pass and a the other player follows through with the hit anyway. You aren’t supposed to hit players without the puck, so as soon as the guy passes the puck off he is vulnerable and not expecting the impact.
Hits from behind are dirty especially when the player is up against the boards. When a player has his back to you and is digging for the puck you can’t hit him straight on because he’s so vulnerable, generally he has his head down looking for the puck and if he gets hit and goes head first into the boards he will get fucked up. You can however hit him from the side so he is not knocked towards the boards.
Another is a knee on knee hit. You see this a lot when a player has a guy lined up for a check and then realizes he’s going to miss, he sticks his leg out to try to get a piece of him. This results in a collision of knees, and is considered dirty because it can result in an injury.