Opposition betting is a camouflage ploy. The idea is to bet small even when the TC count is beginning to rise, and then bet progessively bigger as the count starts to go back down. Whilst the count is coming back down, high cards are being dealt, giving you strong hands and the dealer potentially "bust" hands. You must, of course, back off discreetly once the count drops below about +2 (ideally once you've lost a hand, as a normal player might). By betting opposite to the count in this way, it can look, to the casino, like your betting strategy is working independent of the count, giving you the appearance of not being a card counter. Of course, if you continue to use this ploy, then a pattern emerges and suspicions may be aroused, so it is best to use this ploy as one of many to create camouflage.