following average values are used to calculate rating:
damage,frags, spotted, defence points, captured points, average tank tier
Efficiency formula:
DAMAGE * (10 / (TIER + 2)) * (0.23 + 2*TIER / 100) +
FRAGS * 250 +
SPOT * 150 +
log(CAP + 1)/log(1.732) * 150 +
DEF * 150;