In a thread below, Pro21 suggests that the Stacker Play chapter of Get The Edge At Blackjack is a reprise of methods used as far back as the 1950's.
The technique, as I wrote it, is a method of ordering cards via deviations from playing strategy and physical re-ordering in handheld games, for the purposes of creating card sequences which can be predicted after the shuffle, without the need for memorization as with other forms of shuffle analysis. It is nothing to do with the cheating technique of hi-lo stacking, which is used by crooked dealers.
Pro21 offers no sources for his assertion, indeed he says none exist. He does not describe the method used. I find this very difficult to believe, because rough basic strategy and card-counting were known only to a small cabal of players during these years,let alone more sophisticated methods.
Can anyone offer support for Pro21's claim?