The Release

The Release of the bowstring is the most critical step in the sequence.
If it is not done correctly, then all the effort in the previous steps is cancelled out.
To release the arrow correctly, the fingers holding the bowstring must allow the string to slip off the fingers.
All three fingers must release at the same time.
This will let the bowstring pull away from the fingers with the least amount of deflection.
When the release is done correctly, the hand should move backwards, as the back muscles will pull the arm backwards and the fingers should come to rest beside the neck.
If the finger muscles are flexed open to release the bowstring, then the hand will usually come to rest about 5cm away from the neck.
Flexing the finger muscles will deflect the bowstring sideways and the arrows will have a horizontal spread across the target.