function priceCallback (bytes32 coin_pointer, uint256 result, bool isPrePrice ) external onlyOwner {
        require (!chronus.race_end);
        emit PriceCallback(coin_pointer, result, isPrePrice);
        chronus.race_start = true;
        chronus.betting_open = false;
        if (isPrePrice) {
            if (now >= chronus.starting_time+chronus.betting_duration+ 60 minutes) {
                emit RefundEnabled("Late start price");
                forceVoidRace();
            } else {
                coinIndex[coin_pointer].pre = result;
            }
        } else if (!isPrePrice){
            if (coinIndex[coin_pointer].pre > 0 ){
                if (now >= chronus.starting_time+chronus.race_duration+ 60 minutes) {
                    emit RefundEnabled("Late end price");
                    forceVoidRace();
                } else {
                    coinIndex[coin_pointer].post = result;
                    coinIndex[coin_pointer].price_check = true;

                    if (coinIndex[horses.ETH].price_check && coinIndex[horses.BTC].price_check && coinIndex[horses.LTC].price_check) {
                        reward();
                    }
                }
            } else {
                emit RefundEnabled("End price came before start price");
                forceVoidRace();
            }
        }
    }