[Xenon]

very easy to do:

open showthread.php

find:

PHP Code:

// *********************************************************************************
// get thread info
$thread = verify_id('thread', $threadid, 1, 1);
$threadinfo = &$thread; 


and below add:

PHP Code:

if ($threadinfo['threadid'] == xx AND $bbuserinfo['posts'] < yy)
{
print_no_permission();
}