Translated from Pertti Ruha’s BLOG.
Although there are many nuances in the way to grip a sword with both hands and as described in the various sword schools, so most practitioners recognize the description below as a general generic version, suitable for most beginners in the Bujinkan.
When training with the Japanese sword, one places his right hand on tsuka near the tsuba and the left hand grips the end of the tsuka, with the little finger placed on kashira. This is the basic way in which it holds a Japanese sword, regardless of whether a person is right- or left-handed.
Although it may seem that a left-handed person should keep the sword in the opposite way, with the left hand in front and the right-hand end of the bracket, but this is inappropriate for several important reasons.
A great advantage is achieved by holding the sword with the right hand forward. When holding the sword in front of you with the point towards the opponent’s eyes in Seigan no kamae, the area around your heart protected by the sword, and are less available to your opponent. If you would keep your sword in the opposite way, the area around your heart more exposed and as an easier target.
In terms of distance to the opponent, this can be determined by both parties by keeping their swords in Seigan and moving to positions where the swords overlap by about 10 cm from the tip. This puts each individual within about one step from being able to reach his opponent’s body.
In this position is the basic position of the tip of the sword on the left side of the opponent’s blade, ie, the heart-side of the opponent’s body. This puts the tip of the sword on the line for the shortest distance to your opponent’s heart.
In addition to being within the shortest reach of delivering a fatal blow to your opponent, you are also in a good position for protection. If your opponent would suddenly lunge with force against your heart, your best defense would be a simple twist of the torso and hips. By bringing your right shoulder forward, left shoulder backward avoid the attack. In this way, your sword deflect the opponent’s incoming fade away to the left side, while your own sword would stay on the line against your opponent’s heart.
You can imagine that it would be very difficult to do this if you held the sword with his left hand forward.
With both sides in this strategic position, it may seem that a stalemate could last forever. But even with an almost imperceptible change in breathing or perception of a faltering gaze, the one side sees an opening and suddenly attacks it, by starting from Seigan — and the battle begins. Or, as in our case, we begin our training.