Thought you might enjoy a little challenge. On page 20 of The Theory of Blackjack, Griffin writes: "The decision not to double (6,2) v 5 must be the closest in basic strategy blackjack. The undoubled expectation is .130630, while doubling yields .130583."

Giving the master the benefit of the doubt, perhaps he was referring to single-deck blackjack only, in which case, as always, he would be correct. But, allowing for any (standard) number of decks, any set of (standard) rules, there is a closer play, which, to my knowledge, is the absolutely closest play in the game.

Do you know what it is? (Note: Griffin's difference, above, is 0.000047 -- 47/10,000 of one percent -- while the play I have in mind is 0.000029.)

Don