Billiards is a very popular game. "Roll the balls" is available to everyone. Party speed and entertainment depend on the level of training of opponents. At first glance it seems that there is nothing complicated in this game, but this is far from the case.
Billiards is a real sport.
Fans do not particularly bother about tactics and strategies in general, for them this game is a simple and enjoyable entertainment. For professionals, the opposite is true, in their eyes it is a real sport that requires daily grueling training. For them, not empty words klapshtos, guy and doublet. Billiards does not tolerate neglect, momentary relaxation and unprepared blows.
There is undoubtedly a share of luck: how the ball will rise after hitting or playing, the excitement and fatigue of the opponent. But all this will not be in your favor, if you do not approach any blow, even at first glance very simple, as assembled as possible.
What is a doublet?
A doublet is a very difficult blow, which can be performed by a person with sufficient experience in playing billiards. Do not expect that by devoting a couple of hours to training, you will be able to learn how to regularly carry out this blow. So what does it take to master a doublet? This is, first of all, the ability to perfectly perform a simple direct hit - with a cue in the center of the ball. There is no need to rush, it is necessary to bring the execution to automaticity. Hands clearly always follow the same movements, absolutely not distracting you, you are focused only on calculating the trajectory of the impact. A direct hit (or, as it is also called, klapshtos) is good in that the directions of the movements of both the cue ball and the ball to be hit are easily guessed. The movements are always straight, only the angle needs to be adjusted.

At its core, a doublet is the same direct hit, with only one difference: the cue ball touches another ball after interacting with the board. This is the whole complexity. You need to calculate the approximate angle of impact in the side so that it then clearly hits the desired point on another ball.
Note for beginners
In fact, a doublet is not the hardest hit. After two or three training sessions, even for a person who has never performed it, an understanding comes of how to act. The difficulty lies only in the realization of how the cue ball behaves after the board. You need to feel as many strokes as possible, and then the trajectory will automatically, at the level of intuition, line up in your head. There are much more complex strokes, which will take years of training and tremendous zeal to complete.