Approximate ELO

static final double DRIFTED_ELO_AVERAGE = -2397.92418506835;

static final double DRIFTED_GLICKO2_AVERAGE = 1468.99474237645;

static final double DESIRED_AVERAGE = 1600;

static double calculateElo(double driftedElo) {
    return driftedElo - DRIFTED_ELO_AVERAGE + DESIRED_AVERAGE;
}

static double calculateGlicko2(double driftedGlicko2) {
    return driftedGlicko2 - DRIFTED_GLICKO2_AVERAGE + DESIRED_AVERAGE;
}