As for playing against an open pair:
You know, of course, that it is always dangerous. I am speaking
only of the times when you have a higher pair, concealed of course.
Only a losing player bets because he has a number of "over"
cards which, if paired, will beat the showing pair. Except as
a bluff, such hands should be dropped. In most cases the higher
pair must not be dropped, but it is losing play to raise on it.
The only time to raise is when you are alone with the open pair,
when you have a lower limit before the last card, and you want
to coax the open pair into checking to you on the last card. A
bet by the only pair on the last round puts every other player
on a terrible spot. There are few more effective bluffs against
good players, because everyone knows that when a tight player
gets a pair showing, there is a very good chance that he has two
pairs or better.
Watching other cards. It takes
a pretty good stud player to watch all the cards and draw the
proper conclusions from them. Every player, however, can watch
for the cards that most affect his hand. Sometimes simple observation
leads you to some valuable conclusions. Suppose you have neither
the temperament nor the aptitude for concentration to watch and
remember every card, but you have observed the cards in general
and have noticed that a "lot" of spades have shown.
If you have a doubtful play on a spade four-flush for the last
card, this observation will cause you to drop fast. If you have
noticed an absence of showing spades, that might persuade you
to stay in on your four-flush.Much
more important is to watch every card that pairs one of your cards.
The appearance of those cards has a tremendous effect on your
chances. For example, if you have an ace in the hole and no other
ace has shown, the odds are 4 to 1 against your pairing it eventually.
If one ace has shown, the odds go up to more than 6 to 1 against
you. If two other aces have shown, for all practical purposes
your ace is valueless except as a high card.