function getScore_V6( $real_cf, $rules_file, $stake, $isGROI = 'KROI', $_echo=true ) {   // GROI, ROI, KROI
    static $RULES_BY_FILES;
    if(!isset($RULES_BY_FILES)){
        $RULES_BY_FILES = array();
    }
    if(!isset($RULES_BY_FILES[$rules_file])){
        $RULES_BY_FILES[$rules_file] = @json_decode(@file_get_contents(__("%s/json_overw_rules/%s.json", dirname(__FILE__), $rules_file)), true);
        if(!is_array($RULES_BY_FILES[$rules_file])){
            throw new Exception("ERROR: cant read rules from $rules_file");
        }
    }
    $score = 0; $n = 1;
    $roi = array();
    $min = -20; $max = 20;

    $roiIdx = 0;

    if ($isGROI === 'GROI') {
        $roiIdx = 1;
    }else if($isGROI === 'KROI') {
        $roiIdx = 2;
    }

    $bk_rules = $RULES_BY_FILES[$rules_file];

    foreach ($bk_rules as $bks => $local_rules) {
        if (!empty($stake[ $bks ])) {
            #$cf_diff = -((1 / $real_cf) - (1 / $stake[ $bks ])); #OVERW
            $fork_income = 1 - ((1 / $real_cf) + (1 / $stake[ $bks ])); #FORK_INCOME

            #$cf_diff = $stake[ $bks ];
            $inx = strval(ceil($fork_income / 0.0025)*0.0025);

            #if ($min > $local_rules['min']) $min = $local_rules['min'];
            #if ($max < $local_rules['max']) $max = $local_rules['max'];

            if (isset($local_rules[ $inx ])) {

                if (!is_array($local_rules[ $inx ]) && $isGROI === 'GROI') {
                    throw new \Exception('Error: invalid rule format - GROI not found!');
                }

                if (!is_array($local_rules[ $inx ]) && $isGROI === 'ROI') {
                    $roi[] = $local_rules[ $inx ];
                } else {
                    if (is_array($local_rules[ $inx ])) {
                        $roi[] = $local_rules[ $inx ][ $roiIdx ];
                    }
                }

                if($_echo){
                    echo __("\t%s%.2f\n", str_pad("$bks:", 15, " ", STR_PAD_RIGHT), $roi[count($roi)-1]);
                }

                $in1 = $inx;
                for ($i = 0; $i < $n; $i++) {
                    $in1 = $in1 - 0.0025;

                    if (!is_array($local_rules[ strval($in1) ]) && $isGROI === 'ROI') {
                        $roi[] = $local_rules[ strval($in1) ];
                    } else {
                        if (is_array($local_rules[ strval($in1) ])) {
                            $roi[] = $local_rules[ strval($in1) ][ $roiIdx ];
                        }
                    }
                }

                $in1 = $inx;
                for ($i = 0; $i < $n; $i++) {
                    $in1 = $in1 + 0.0025;

                    if (!is_array($local_rules[ strval($in1) ]) && $isGROI === 'ROI') {
                        $roi[] = $local_rules[ strval($in1) ];
                    } else {
                        if (is_array($local_rules[ strval($in1) ])) {
                            $roi[] = $local_rules[ strval($in1) ][ $roiIdx ];
                        }
                    }

                }


            }
        }
    }

    $avg_roi = 0.00;
    if (count($roi) > 0) {
        $avg_roi = array_sum($roi) / count($roi);
        $score = ($avg_roi - $min) / ($max - $min);
    }

    $_SERVER["API_SCORE"] = $score;

    echo __("\n[#] SCORE V6 by %s: %.2f / %.2f\n", $rules_file, $avg_roi, $score);

    return $score;
}