> Should I recalibrate when the pen is good by
> judging what it is at the beginning of the
> last hand rather than at the end of same?
> Does it matter?

Yes, yes. If you're at 3rd base 70% pen is great for you to alter playing decisions. 70% pen is not as great for playing decisions if you're at first base. As far as betting goes, it's important to note the pen at the beginning of the last hand. Other than playing strategy, what good does 70% pen do you if it is reached after the last hand and it's time to shuffle?

Pen in single deck games is usually described as "Rule of 6" or "Rule of 7", "Rule of some number". Rule of 6 means the number of rounds and the number of hands being played equal six. For example: RO6 game with two players, each betting one spot. The dealer will deal four rounds and then shuffle. 4 rounds to 2 spots = RO6 game.

As you noticed, the number of spots being played will effect penetration in a SD game. This is one reason why many recommend playing with fewer players at the table.

Hope this helps
Johnny Bravo