Game Score is a formula devised to measure total player productivity on offense and defense.
The formula is PTS + 0.4 * FG - 0.7 * FGA - 0.4*(FTA - FT) + 0.7 * ORB + 0.3 * DRB + STL + 0.7 * AST + 0.7 * BLK - 0.4 * PF - TOV.
Source link contains full Game Score rankings from basketball-reference.com
Game Score ratings are not available prior to 1978 due to incomplete recording of various statistics (BLK, STL, etc)
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