How is this affected by indexes?

This chart looks very different. Here a comparison is made between full indexes (100+) and no indexes. Blackjacks and Insurance have been removed. The green line is the same as in the above chart, percentage of hands doubled with full indexes. The cyan line shows the hands doubled when there are no indexes. The lines are completely different. Without indexes the cyan line starts very high and drops substantially as the count increases. This is because there are many low cards available at low counts, both for the dealer's upcard and for your own hand, allowing many doubles. As the count increases low cards are less common. But many of these doubles are a mistake at low counts since you will probably also draw a low card and the dealer will probably not bust. So the indexes save you from doubling when you shouldn't at low counts. The green and cyan lines cross at about true count zero. Here there are fewer low cards making fewer of the more common doubles available. But more indexes have been reached identifying more opportunities. These opportunities, like 9v7 are now available because the large number of high cards increases the likelihood that you will win the hand. Splits displayed in red for 100+ indexes and blue for no indexes behave in much the same manner. However, keep in mind that the very large-magnitude true counts are rare and we should not be playing at the very low true counts.

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 © 2009 Norman Wattenberger