Código PHP:
<?
$conn = mysql_connect("localhost","root","");
mysql_select_db("yugi",$conn);
$total = mysql_query("SELECT COUNT(*) FROM yvd_users");
$total = mysql_result($total,0);
$pais = mysql_query("SELECT DISTINCT pais FROM yvd_users");
while($yo = mysql_fetch_assoc($pais)){
$paises = $yo['pais'];
}
$count_paises = mysql_query("SELECT COUNT(*) FROM yvd_users WHERE pais = '".$paises."'");
$count_paises = mysql_result($count_paises,0);
$mitad = ceil($count_paises/2);
$total_paises = mysql_query("SELECT * FROM yvd_users WHERE pais = '".$paises."' LIMIT ".$mitad);
$total_paises2 = mysql_query("SELECT * FROM yvd_users WHERE pais = '".$paises."' LIMIT ".$mitad.",".$mitad);
while($rowPaises = mysql_fetch_array($total_paises))
{
while($rowPaises2 = mysql_fetch_array($total_paises2))
{
echo $rowPaises['nick']." vs ".$rowPaises2['nick']." (Pais: ".$rowPaises['pais'].")<br>";
}
}
?>