I don't know for sure - as I've never met this usage - but I would guess from the context that the goalie (=goalkeeper) is standing slightly (='a shade') to the right or the left side of the goal, giving atackers a slightly wider target at one side or the other.."This is especially true if the goalie is shaded to one side of the field."
What does "shaded to one side" mean?
I couldn't find the original example on the web, but found better ones just now:
"How these receivers get open more quickly than usual against these tough NFL defenses is where the bunching comes in. This formation involves a small knot of receivers. One man sets up on the line of scrimmage before the ball is snapped. One or two line up directly behind him, slightly shaded to one side."
"An asphalt path, shaded to one side by an avenue of tall lime trees, opened on the other to a sports field where a cricket match was in progress."
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