public function move(Game $game, $level)
{
$analyser = new Analyser($game->getBoard());
$moveTree = $analyser->getPlayerPossibleMoves($game->getTurnPlayer());
// choose random piece
do {
$from = array_rand($moveTree);
} while (empty($moveTree[$from]));
// choose random move
$to = $moveTree[$from][array_rand($moveTree[$from])];
return $from . ' ' . $to;
}