Technically, the pull-through is a false riffle, not a stack. But the pull-through always indicates a stack, often a discard stack. The tipoff for the pull-through occurs when the dealer cuts the deck into approximate halves for each riffle shuffle and then angles those halves as he riffles them together.
Some professional cheaters use nothing more than discard stacking and a pull-through to operate profitably. That routine is also very effective for bridge. For defending against the pull-through, follow the procedures listed on page 138.
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