This is the first in a new weekly series of playing tips. This one helps with understanding the left hand barre, a major obstacle when learning the guitar.

Full Left Hand Barre
The left hand barre, sometimes called the bar, is possibly the main reason some young guitarists get no further with their studies. Unlike advanced guitar techniques such as tremelo, rasguedo, cross string trills, the Barre comes up very quickly in all players studies, and at the time there appears no going forward until you can “master” it.
Barre is of course where your left hand first finger covers more than one string. A full barre, like the above illustration, covers all strings, and straight away, the first mis-concept comes to the fore. And this because the player often thinks he/she has to cover all six strings at the same time, with same pressure across all strings. Not only is that difficult, to get equal pressure, but in classical playing, prolonged barre playing (and this occurs a lot) leads to left hand fatigue, and the hand simply cannot function efficiently. The main problem here is left hand pressure, and the thumb pressing too hard on the fingerboard to try to get clean sound.

fig 1
But if you look closely at the diagram left, you will see that the barre, while across all strings, only needs to be actually employed for the notes on string 6, 2, and 1. The other fingers are fingering same as open string version of the chord E major. While practicing, play only these three strings, then only the three inner (non barred) strings to understand what the barre is used for, exactly. Now lift off fingers on strings 3,4,5, leaving only the barre in place, and pluck strings 6, 2 and 1 together. The exact point here being that it is not necessary to apply full pressure across all strings at the same time to play this chord, the barre only needs strings 6,1 and 2 to sound clear. With every barred chord you play, establish which strings need to sound while covered by the bar, and practise ways of relaxing the left hand in areas which the barre is not needed. It is awareness such as this which will lessen left hand fatigue. And often, simply being aware is the first stage in eliminating the problem.
When you get more proficient with barre playing, try also taking your left hand thumb off the fingerboard, and pressing down with the left arm. This will prove how much arm pressure is needed for the barre, so as to best minimize thumb pressure, which is what causes pain and fatigue.
Another barre technique is using these two barred chords;
Again, note how, in the second chord, the last string is not needed for the barre. Now, string at fret 7, play slow strum with right hand fingers chord 1. Then relax left hand, switch left hand fingers to form second chord (while keeping the barre in place) and press left hand fingers down to play the second chord, again slow strum, checking for any buzzes. If you get buzzes, listen for the exact string they occur on, and try the barre alone to see if you are pressing the barre correctly.
After you get more fluent, try same exercise at fret 6, then back to 5, and so on, each time employing the same discipline, play, relax, switch, press, in that order. At first, this needs to be slow, then build up the speed.
Later on, add this barred chord to the exercise (D major when played at fret 2)
If you use the full barre here, not just half barre like in the picture, this chord becomes much more difficult, so save this for later in your studies. But then add it to the other three chords, to play the exercises.
The point here is that left hand fingers move more efficiently, while the had is relaxed. If you attempt finger movement while pressing the barre down, left hand fatigue will occur, impairing accuracy of playing. So these exercises are mean for the fingers to move only when pressure is not applied. Don’t worry at first how long this takes, speed and fluency will develop with practice.