function updateReward(address _addr) private
    {
        Player storage p = players[_addr];
        
        if ( 
            games[p.currentRound].ended == true &&
            p.lastRound < p.currentRound
            ) {
            p.reward = SafeMath.add(p.reward, calculateReward(_addr, p.currentRound));
            p.lastRound = p.currentRound;
        }
    }