I am working on a game like Mafia Wars and i am trying to get the fighting system working but i keep getting lose trying to work out who is going to win the fight and it still needs to know if the stats are close then there is a random chace of them winning.

 $strength = $my_strength;
 $otherplayerinfo = mysql_query("SELECT * FROM accounts WHERE id='$player_id'");
 $playerinfo = mysql_fetch_array($otherplayerinfo);
 $players_strength = $playerinfo['stre'];
 $players_speed = $playerinfo['speed'];
 $players_def = $playerinfo['def'];

 if($players_strength > $strength){
 $strength_point_player = 1;
 $strength_point_your = 0;
 }else{
 $strength_point_your = 1;
 $strength_point_player = 0;
 }

I was trying a point system but i still could not do it.