Странно у меня работает как часики .
Находим файл /csgo/cfg/sourcemod/sourcemod.cfg
// Requires: reservedslots.smx
// Default: 0
sm_reserve_type 1
// Specifies the number of reserved player slots. Users with the reservation
// admin flag set will be able to join the server when there are no public slots
// remaining. If someone does not have this flag, they will be kicked.
// (Public slots are defined as: maxplayers - number of reserved slots)
// --
// Requires: reservedslots.smx
// Default: 0
sm_reserved_slots 1
// Specifies whether or not reserved slots will be hidden (subtracted from max
// slot count). Valid values are 0 (Visible) or 1 (Hidden).
// --
// Requires: reservedslots.smx
// Default: 0
sm_hide_slots 0
Тогда придется резервировать 1 слот .