You'd only need 4 pieces to seal off the corners - one in each corner. They also can't be captured once in a corner, so the only way white would have a chance would be to limit black to those four pieces and force one of them to move.
(gem) Hvis du vil spare båndbrede kan du reducere mængden af information der vises på dine sider under indstillinger. Prøv at ændre antallet af spil på hovedsiden og antallet af beskeder per side. (pauloaguia) (vis alle tips)