[edddgar]

Here's the explaination of a Game Score from the book:

To determine the starting pitcher's Game Score:
Start with 50.
Add 1 point for each out recorded by the starting pitcher.
Add 2 points for each inning the pitcher completes after the fourth inning.
Add 1 point for each strikeout.
Subtract 2 points for each hit allowed.
Subtract 4 points for each earned run allowed.
Subtract 2 points for an unearned run.
Subtract 1 point for each walk.