[Hot Tabasco]

US just scored on a penalty kick.

Why doesn't the goalie come way out of the crease and cut down the angle like they do in hockey?

[Gimour09]

Must stay on the line until the ball is kicked. Usually they move a few yards just before and although illegal is overlooked unless it’s too much.

[Political Junkie Too]

The goalie is not allowed to move until the ball is kicked.

-PJ

[darkside321]

Why doesn’t the goalie come way out of the crease and cut down the angle like they do in hockey?

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Simple because soccer is not hockey ;-)
But to be serious this would make no sence because what would it help if you take one or maybe two steps out of the goal (because you would not have more time untill the ball hits the goal)

[Dexter Morgan]

Like the others have said, keeper can’t move till the ball is kicked.

To combat that I would set up just left of center because I dove better to my right. The opposing player would almost always kick to my right because he’d see all that open goal. Using that tactic I could stop most kicks that weren’t perfectly placed in the upper corner.