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4 Important Elements of an Effective  Chess Calculation Technique:

1-Always start your calculations by observing the consequences of your opponent’s last move

2-Understand the difference between forcing moves and non-forcing moves

3-Your chess tactics skill supports your calculation skill

4-The ability to calculate deeper variations rely heavily on your visualization skill

**Pin**

The Pin is an important tactical device. Most often, a pinned piece loses its mobility and becomes a perfect object for the opponent`s attack.

**Absolute pin**

If a piece is pinned and there is absolutely no possibility of moving it because its own king is placed behind it, then this pin is called "absolute". A pinned piece often becomes a perfect target for an attack due to its immobility.

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**Relative Pin**

One should bear in mind the difference between the absolute pin and the relative pin. In the case of the relative pin, a pinned piece is not completely paralyzed. It can efficiently enter play even at the cost of the valuable piece that is positioned behind it.

A known opening trap perfectly illustrates this: