private function getPlayerWithMoreThanHalfSeeds()
    {
        $seedsToWin = $this->getSeedsNeededToWin();

        if ($this->grid[Awale::PLAYER_0]['attic'] > $seedsToWin) {
            return self::PLAYER_0;
        }

        if ($this->grid[Awale::PLAYER_1]['attic'] > $seedsToWin) {
            return self::PLAYER_1;
        }

        return null;
    }