Although this information is specific to the game of Carom Billiards, it is clear it will help you figure out (1) how the rails can be calculated and (2) how to efficiently use the diamonds situated around the table. Follow each step… one at a time.
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VIDEO : Donald Duck explains the Diamond System (produced in 1959 and still actual)
This system is considered to be the universal method for carom billiard.
It’s a common fact that in a game of Carom Billiard more than 1/3 of the points will be made with the help of this technique. The shots shown below are just a few examples of the points that can be accomplish with this method.
Although the formula is quite simple to memorize, the position markers are much harder to remember, the values carried over on the table being different for the 3 parameters (A, S, F).
To remember: Aim = Start - Finish
If you have difficulties remembering all the diamond system parameters, for now I suggest you use this method for shots where the Finish point is between 0 and 40 and the start point between 35 and 60. When you feel comfortable with these parameters, go on with the entire set of numbers. Questions to ask for 20 questions game pigeon.
Execution parameters
This method is efficient for shots played “Long rail- Short rail” when the Start value is higher than the finish value.
It’s not possible to apply this method when the player’s ball is below the 20 marker (2nd diamond on the long rail). Be patient… there is another method for shots below the 20 marker.
In the diagram below, Start is at 30 and finish is at 50, which means it’s impossible to accomplish this shot with this method. At best, one could reach the finish point 30 while using the aiming point 0.
You must keep in mind the finish lines as they are described in the table below.
The markers are located on the rail in front of the corresponding diamond. Note: between the 40 and 90 marker on the long rail, each set of 10 corresponds to ½ a diamond.
| Value | Marker on the long rail | Finish |
| 0 | Diamond 0 (at the corner) | Front to the 6th diamond on the long rail |
| 10 | Front to the 1st diamond | Front to the 7th diamond on the long rail. |
| 20 | Front to the 2nd diamond | Diamond 8 (at the corner) |
| 30 | Front to the 3rd diamond | 5cm right of the 1st diamond on the short rail |
| 40 | Front to the 4th diamond | Between 1st and 2nd diamond on the short rail |
| 50 | Between 4th and 5th diamond | Front to the short rail's central diamond |
| 60 | Front to the 5th diamond | Between 2nd and 3rd diamond on the short rail |
| 70 | Between 5th and 6th diamond | 5cm right of the 3rd diamond on the short rail |
| 80 | Front to the 6th diamond | Front to the 3rd diamond on the short rail |
In this diagram, the finish value is 20. It must come to the attention that each point located on this line is the equivalent of a 20 finish point. There is no difference in calculation between the diagram above and the one below.
When the player’s ball is on the long rail, the start value is given in the table below.
| LONG RAIL | |
| Value | Location on long rail |
| 20 | 2nd diamond |
| 25 | 3rd diamond |
| 30 | 4th diamond |
| 35 | 5th diamond |
| 40 | 6th diamond |
| 45 | 7th diamond |
| SHORT RAIL | |
| Value | Location on long rail |
| 50 | 1st diamond |
| 60 | 2nd diamond |
| 70 | 3rd diamond |
| 80 | Between 3rd and 4th diamond |
| 90 | 4th diamond |
In this diagram the start value is 50.
It’s now time to apply the magic formula: Aim = Start - Finish
The point of aim 30 is given according to the table below.
Note: Between the 50 and 90 marker on the long rail, each set of 10 corresponds to ½ a diamond.
| Value | Location on long rail |
| 0 | Diamant 0 (at the corner of the table) |
| 10 | 1st diamond |
| 20 | 2nd diamond |
| 30 | 3rd diamond |
| 40 | 4th diamond |
| 50 | 5th diamond |
| 60 | Between 5th and 6th diamond |
| 70 | 6th diamond |
| 80 | Between 6th and 7th diamond |
| 90 | 7th diamond |
Note: If the starting point is on the short rail (equal or higher than 50), aim must be done through the rail (aim at the diamond). If it starts on the long rail (lower than 50), aim must be in front of the rail (facing the diamond). In both cases below, the aiming point value is 20.
If ball number 1 is not along the rail, pivot your cue while using your ball’s axis as pivot point until you reach the right application of the formula: Aim = Start - Finish.
This system can be applied to those points called 'natural'. In order to find the point of aim (or the point of impact on the first rail), one must use the pivot method to find the right pair Aim/Start corresponding to the formula. This time, the pivot will be ball number 2 and the pivot line will be the ball’s tangent and not its axis. You will then need to find the corresponding ball in order to reach the aiming point obtained. The two examples below show how to obtain the same aiming point with different number 1 ball positions.
The diagram below gives the path of ball number 1 after the 4th and 5th rail with a 30, 40 and 50 start point.
| 3rd rail numbers (on short rail) | 4th rail (on long rail) | 5th rail (on the front long rail) |
| 30 | 7th diamond | 1st diamond |
| 40 | Between 6th and 7th diamond | Between 1st and 2nd |
| 50 | 6th diamond | At the corner of the short rail |
Extend formula to realize this shots. /pigeon-hd-images-download.html.
That’s it ! And to show you that this method is valid for various points, here’s how to calculate the famous 'umbrella' point (but be careful it’s still a hard shot to accomplish).
Because this system is not perfect, compensation had to be put in place. To learn more about compensations to the system, visit BILLARD CLUB SOTTEVILLAIS
Are you ready for the next step: CUE BALL CONTROL