This formula works for calculating the score of a Chess Cards game:

X=V(N+S)B

X=Game Score; V=mating card value; N=move number; S=number of sacrificed cards; B=bonus*

*If N + S ≤ 10 then B = 1 else B = N + S - 9

Note that a game score is only calculated if a player has achieved a 'mate' (played a piece (card) that the opponent cannot answer).