In the half pass the horse moves sideways along the diagonal line, while looking in the direction of movement. The forehand should be slightly ahead of the quarters and the horse should be equally bent through the body from poll to tail. The fluency of the pace should not be interrupted with the normal rhythm, balance, tempo and cadence of the pace maintained.
Performed correctly, the perfect half pass should flow from one side of the arena to the other, with the rider able to sit effortlessly in the saddle.
As tests progress in difficulty up the competitive levels of dressage, so does the angle of the half pass, requiring greater crossing of the legs and gymnastic ability. Half pass can be ridden in both trot and canter.
Half pass should not be attempted until the horse is established in both shoulder-in and travers.
Aids for riding half pass
The basic aids for lateral work, including half pass, are the same regardless of the movement being performed:
- the rider’s weight should remain in the direction of the movement
- the rider’s inside leg is responsible for bend and forward momentum
- the outside leg controls the amount of sideways movement
- the rider’s inside hand never pulls back or crosses over
- the rider should look in the direction in which they are travelling
So to ride half pass to the left, the left leg is on the girth asking the horse to bend to the inside and maintain impulsion. The right leg is behind the girth asking the outside hind leg to step over under the horse’s body and control the quarters. The left rein asks the horse to flex to the left and remain soft in the jaw. The outside rein prevents the horse from bending too much or rushing forward. The rider’s weight should be directed towards the inside seat bone.
Preparation for the half pass should start before the corner with one or more half halts to help balance your horse. For example, in preparation for left half pass, the rider should sit a little to the left, with their left leg a little forward.
It is very easy to ride a half pass without knowing exactly where the horse’s quarters are. Quarters trailing by a couple of inches can lose you marks, but in the early days of training, not pushing the horse over too parallel will gain more freedom of movement.
Trying to achieve too much bend can also encourage the horse to leave the quarters behind. But the biggest mistake is to have the quarters leading. This often happens in the first stride after a change of bend in the canter zig-zag (at grand prix level).
Riding transitions, as well as increases and decreases within the pace, while in half-pass is a useful training exercise. For example, ride half pass (or shoulder-in) going from trot to walk while still travelling sideways and then go back to trot again. Working in collected trot to working trot and then medium trot and back again to collected trot will help improve the gaits while still travelling sideways.
In the grand prix, the zig-zag movement in canter requires three strides left then six right, six left, six right and three left, back to the centre line. The marks for this movement are doubled. Not only is the half pass in canter, but the rider also needs to count the strides accurately.
This is where you need the ability to change the bend a stride early, as this movement comes very fast. In earlier tests, the movement comes during the trot work and, here, the training for the preparation and changes of direction really show. Quarters trailing will become quarters leading. A zig-zag also exposes the weakness of a one-sided horse.