One would think that with blackjack online hands being dealt from an electronic shoe, it would be easy to count cards-a player could make notes without the casino catching on. But the truth is, this proves much more difficult online than offline. A very important factor with blackjack online is penetration; the number of cards dealt before the deck is reshuffled. The more cards deal in a blackjack online game; the easier it is to assess what cards might come later; but only if the pack remains unshuffled. Blackjack online casinos, retaining their edge, therefore reshuffle before every hand.