Everyone is different, with different abilities when it comes to memorization. One of the goals of THLCCS was to allow people to choose their own effort vs reward stopping point when it comes to learning indices. For the game I mentioned above (4.5/6 S17 DAS), we identified 128 indices, some of which we knew were of very little value. However, as I said above, learning the top 20-25 of them will almost double SCORE vs playing basic strategy when counting. Learning another 25 gets you a few extra percent. We didn't go beyond 50 for play-all nor beyond 40 for back-counting because there is so little gain beyond that (pennies per hour). As part of those 50 we also recommended using the risk-averse index for doubling 10 vs T (+7 for Hi-Lo) because using the EV maximizing index (+4) actually reduces SCORE. Finally, we noted that SCORE is not maximized by learning all of the indices. In this case learning the top 121 maximizes SCORE and using the remaining 7 reduces SCORE by 0.14%.
Bottom line: it is not necessary to learn all of the indices and folks can choose their own stopping point based on the charts in our book.
Doubtful. For the book we omitted plays which occur less than once every 2 million rounds. There were plenty of these and, as noted above, many more which were close to this line but of no real value.
16 vs 9 is one of the I18. It's unthinkable that you didn't know this one. And you should never guess at an index if you don't know it.
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