An aphorism about music I always liked:
A difference between a professional and amateur musician is that an amateur practices a song until he gets it right, while a professional practices it until he can’t get it wrong.
Poker:
Beginning poker players play any cards. Good amateurs play the odds. Professionals play the people. This is especially true at no-limit and shorthanded poker. A lot of amateurs get themselves in trouble when they watch the hand selection and playing styles of professionals in the late stages of no-limit tournaments, and think that this translates in the local 3-6 limit game. The pros play the hands they are playing based on their judgement of things like their opponent’s state of mind, their relative stack sizes, whether they have a dominant position, etc. None of this matters in a full loose ring game.
A few things about playing pool at a professional level:
[ul]
[li]A professional pool player is always thinking at least three shots ahead - not just how to make the ball, and not just how to make the ball and get cueball position for the next shot, but to get cueball position for the next shot in such a way that it gives the right angle to move the cueball to the shot after that. If you can do that, you can run tables.[/li]
[li]Professional pool players, when banking shots, will consider how the room humidity changes the rebound angle off the cushion. Other things that change the rebound angle: cushion hardness, ball spin, speed of the shot.[/li]
[li]Professional pool players will cut a ball into a pocket when possible with a little bit of outside spin on the cueball, to minimize the ‘throw’ effect on the balls. The throw effect comes from the fact that the balls have slightly dirty surfaces, and therefore stick together and travel together a bit before separating. Since it’s impossible to predict how much ‘throw’ there will be (there’s a random factor that comes into play here, since the contact point of the balls might be the spot that has chalk on it from the cuetip), imparting a little spin on the cueball causes it to roll off the object ball instead of sticking to it, making the cut more predictable.[/li]
[li]When a pro player calculates where the cueball will go after cutting a ball into a pocket, he considers the spin that the cueball picks up after rubbing against the object ball, and how that will change the rebound angle after it leaves a cushion.[/li]
[li]In eight ball after the break, the player usually has a choice of whether to take solids or stripes. Weak players tend to always take the side that has the most balls already pocketed. Good players look at which balls are in a better position for running out the table. That means taking the side that has fewer balls tied up in clusters, or have the most open pockets.[/li]
[li]In 9 ball after the break, pro players are immediately looking for ‘problem balls’, and planning a strategy for eliminating the problem as early as possible. That means if there’s say a cluster with the 7 and 8, they’re trying to solve that problem by breaking the cluster open on a shot as soon as possible. No one wants to run down to the 7, then try a miracle shot, only to leave the opponent with three balls to pocket for the win. You see amateurs doing this all the time.[/li]
[li]Pro players never ‘lose’ the cueball (meaning making a shot and having the cueball go careening around the table unpredictably). They try to always know the exact path the cueball will be on, and where it will stop. Losing the cueball means taking a chance on scratching or of hitting other balls in a way that destroys your strategy fpr running the table. This even includes the break. A pro player tries to break in such a way that the cueball jumps back off the rack and stops in the center of the table, giving the maximum probability of having a shot after the break.[/li]
[li]In 9-ball, if there are balls tied on on the table in such a way as to make a run-out very difficult, pro players immediately start thinking about safeties, and play position not to run the table, but to set up a good safety shot.[/li][/ul]
In general Pool is far more nuanced and rich in strategy than most amateurs ever know, including a lot of ‘bar’ players that have been playing the game every night for years. Some of them are great shot makers, having practiced so much at judging angles, and yet they get trounced by players who really study the game. It’s also why pool hustlers can make so much money against these players. They never look as good as they are, because the weak players don’t pick up on the little thngs they are doing (like ‘accidentally’ tying up a couple of the opponent’s balls, missing shots inentionally but in such a way as to solve a problem on the table or to make a problem for the opponent, etc).