He also writes at length about how ineffective ordinary card counting systems are when used against OU13. Snyder goes through a great deal of analysis in his article, including computing the EORs and proposing six different card counting systems. To give an idea of how well understood advantage play is against OU13 one has to look no further than the work of the great Arnold Snyder: If it exists, a casino somewhere will find a way to screw it up. Although it was offered on a game that used a continuous shuffler (hence safe), the very fact that it still exists is reason enough to consider it. I did not expect that I would ever write about it here, but that changed when I recently spotted it in an overseas casino. By the time I started looking at advantage play against side bets, OU13 was already long gone. OU13 was first offered at Caesar’s Tahoe in 1989, and became very popular by the early 1990’s. These were even-money wagers, nothing fancy. The player had the opportunity to wager that his two cards would total more than 13 (Over) or would total less than 13 (Under).
A long long time ago, in a casino far far away, there was a blackjack side bet called “Over/Under 13” (OU13).
