<br>Nothing to add, but the comments you forwarded seem sensible<br>to me based on my dim recollection of counting cards at blackjack<br>too many years ago..<br><br>Ben<br><br><div><span class="gmail_quote">On 4/30/07, <b class="gmail_sendername">
Damien Broderick</b> <<a href="mailto:thespike@satx.rr.com">thespike@satx.rr.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
At 02:49 PM 4/30/2007 -0500, I wrote:<br><br>>I blame science fiction for this absurd counterfactual of an<br>>"infallible clairvoyant."<br><br>This comment might have had the unfortunate effect of deterring the
<br>knowledgeable from further comments that might help disambiguate<br>cheaters from psychics in such games. Please don't be put off!<br>Meanwhile, I posed the same question to several people with long<br>experience studying what's dubbed, in our current partial
<br>understanding of the phenomena, "the paranormal". Here's one<br>response; I'd welcome any comments by gts or Ben or others (but<br>knee-jerk, semantically empty cries of BULLSHIT might as well stay at home):
<br><br>==============<br><br>Nothing dependent on outside observation of card play can<br>disambiguate a psychic from a cheat who's managed to secretly mark<br>the cards. This holds for all card games, not just blackjack.
<br><br>Aside from this, however, patterns of play depend on what wild (or<br>mundane) talent a player is exercising.<br><br>A card-counter, according to most of the card-counting strategies I<br>have seen, plays the optimal strategy at all times; sticks the
<br>minimum bet most of the time and increases it minimally when the odds<br>favor winning. Since the optimal strategy is known it can be observed<br>that the player is following it; he profits only because he places<br>higher bets during his winning streaks. A psychic, on the other hand,
<br>may get cues that cause cardplay to deviate from the optimal strategy:<br><br>Behavioral clues that a player is a "clairvoyant" who can reliably<br>"see through" one thickness of pasteboard:<br><br>
-Always buys the "insurance" side-bet if the dealer actually does<br>have a hidden blackjack, and never buys it otherwise. [Optimal<br>strategy never buys insurance -- lacking inside information, it's a<br>sucker bet that increases your overall loss rate.]
<br>-Never busts when requesting another card. [This may cause him to<br>decline a card when the optimal strategy calls for one.]<br>-Doubles down whenever his third card brings him to 21, or to a<br>number that will beat the dealer's initial hand of 17 or better
<br>(standard rules require the dealer to stand on such a hand). [This<br>will almost certainly produce double-down bets when the optimal<br>strategy says otherwise.]<br>-Keeps initial bet at a constant level. [Inconsistent with card counting.]
<br><br>Less than 100% reliability will turn these absolutes into tendencies,<br>while the ability to see more than the very next card (and dealer's<br>face-down card) will allow more impressive stunts during play.<br>
<br>Behavioral clues that a player is a "precognitive" who gets a<br>short-term warning only of good or bad outcomes, without details:<br><br>-Bets the lower limit most of the time, but unpredictably raises bet<br>
to the upper limit, and is always dealt a blackjack when this<br>happens. [Inconsistent with card-counting. Over the long run,<br>probably also inconsistent with dealer's sanity. I am assuming that<br>the precog gets immediate feedback on the outcome of one decision or
<br>event at a time, and winning on a dealt blackjack is the only<br>*immediate* good outcome possible when deciding whether to play another hand.]<br>-Shows same behavior as clairvoyant with regard to "insurance" bets.
<br>-Does not show clairvoyant's immunity to busting. (Sometimes the<br>sequence of undealt cards is such that you will bust if take a card,<br>and lose if you don't. In these cases the precog's good/bad signal
<br>gives no guidance since it returns "bad" no matter which option he considers.)<br>-Does not show clairvoyant's knack for knowing when to double-down<br>(that decision requires more than 1 bit of information).
<br>-Will unpredictably stand pat with a poor hand contrary to optimal<br>strategy, and wins these hands because dealer busts.<br><br>As in the previous example, less than perfect reliability will turn<br>these absolutes into tendencies. For plausible levels of psi talent
<br>(i.e. comparable to levels seen in controlled experiments), extended<br>observation would be needed to identify any of these patterns,<br>although even a small edge over the house will allow a player to<br>profit consistently in the long term.
<br><br>Of course, whether the ongoing stress and distraction of a game of<br>chance is consistent with psi operation *at all* is a completely<br>separate and open question.<br><br>===================<br><br>Damien Broderick
<br><br>_______________________________________________<br>extropy-chat mailing list<br><a href="mailto:extropy-chat@lists.extropy.org">extropy-chat@lists.extropy.org</a><br><a href="http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat">
http://lists.extropy.org/mailman/listinfo.cgi/extropy-chat</a><br></blockquote></div><br>