Last updated on November 10, 2020
Beginner’s guides. How to play backgammon.
This Deluxe Backgammon post is another in our series for beginners and newcomers. Today we are going to take a look at the concept of slotting.
What is slotting?
In order to protect your checkers from hits from your opponent you have to secure points. To make a point on the board, all you have to do is to put at least two checkers on it. Once you have at least two checkers on a point on the board your checkers cannot be hit. Additionally, you now own that point as long as your checkers stay there. This means your opponent cannot land on the point, which creates an obstacle for their movement.
A string of adjacent points is known as a prime. A six-point prime creates a barrier that cannot be breached. Slotting involves moving a single checker to a vacant point with the intention of securing it with another checker on a subsequent roll. Slotting is a risky backgammon tactic. However, it is the fastest way to secure points on the board. There are times when slotting is quite safe. For example, when your opponent has checkers on the bar or when the point you slot is at a safe distance from any attack. The key is to know when to, and when not to, slot.
When to slot
Sometimes you are forced to slot. That is when your roll leaves you no choice but to expose a checker to direct attack. If this happens, you will have two approaches to consider, attack and defence. To attack, slot the point that will result in the most constructive position should you not be hit. If that isn’t possible, slot the point that will do you the least harm if you should be hit. To defend, use your knowledge of probability to slot the point least likely to be hit.
When your opponent has blots exposed in their home board, it’s often a good tactic to take the chance and slot. If the opponent hits you, their blots would be exposed to attack from your checker re-entering. As a result, if you hit in reply, they will lose a lot of ground in the race. If you don’t get hit, you will have the opportunity, on subsequent rolls, to secure your slotted point.
At the start of play the 6 and 13-points are heavily stacked with five checkers each. These excess checkers are effectively out of play and it is a good idea to move them into more constructive positions by slotting. For example, with the opening rolls (5-1, 4-1, 2-1), the 1 can be slotted to the 5-point. This does involve some risk, as you can and will be hit with any roll of 4. However, this play affords considerable advantage if you succeed in securing the point on the following roll.
Slotting can be used to make an important point that you would have trouble making otherwise. For example, if you are trying to build a six-prime, but have gaps in your wall, slotting is often the most efficient way of securing it the missing points. Like all slotting decisions, this is not without its risks, however a short-term risk can often lead to a stronger long-term position.
When not to slot
Don’t take unnecessary risks. If you have a number of builders converging on an important point there is no need to add additional risk by slotting. Use the existing material to secure the point. Slotting just adds an element of risk by leaving an unnecessary blot exposed.
If your opponent has split their back checkers be careful of slotting, particularly the 5-point or the bar-point. This would leave your checker at risk from a double direct hit. In this situation there is too much ground to be lost if your blot is hit. Likewise, if you have split your back checkers, slotting is generally a bad move, as it would leave three or more blots on the board. Taking risks is important, particularly early in the game, but there should be a limit to the level of exposure you are willing to take.
There are other factors that determine when, and when not, to slot. These are based on the specifics of each position. Consider these questions before you decide on slotting:
How good is your opponent’s inner board? If they have a strong board, slotting becomes very risky, as a subsequent hit means you might struggle to re-enter from the bar. If their home board is weak, slotting becomes a much better option. Alternatively, if you have an anchor in your opponent’s home board, slotting becomes far less risky, as you have a point of re-entry if hit.
How strong is your own home board? If you have a strong position in your own home board it allows you to play more aggressively, particularly if the opponent’s back checkers are trapped. Slotting can provide the opportunity to close and gaps and secure a stronger prime. Slotting nearly always incurs risk, so even if your home board is strong the decision to slot must take into account the opponent’s home board strength. For example, it wouldn’t matter how strong your home board was if your opponent had a closed home board. In that instance, it wouldn’t be worth the risk of slotting. It would be far better to wait until your opponent has lost their timing.