#1
I have quite small hands. With some chords, like powerchords, my fingers are arced *except* for the last bone of my fingers. If I try to arc them too, I cannot stretch wide enough to do a powerchord, at least at the first frets. This is something a teacher (not mine) remarked on my playing. So is this wrong and how should I fix this?

Crappy pictures to follow:
Each / is a finger bone (there are 3!).

My technique:

.._ Hand
./
/
Guitar

Instead of:

._ Hand
/
|
Guitar
#2
My technique:

.._ Hand
./
/
Guitar

Instead of:

._ Hand
/
|
Guitar


hahaha that is hilarious...if you have small hands though you probably can't do anything about it even though it's wrong, you'll just have to deal with it

EDIT: in fact, in might even help you to mute your lower strings having it flat like that
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#3
What sort of guitar do you play?
You may want to try a guitar with a slimmer neck, Ibanez Wizzards etc.
JS1000 for example.
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#4
There are some problems with playing like that. You probably would have a hard time playing a B minor chord for example, or barre chords. It will probably improve if you play a lot; your hands will become stronger and more flexible.
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#5
I have a PRS SE Custom, whose neck is between Gibson and Fender. I will try the fingering on a friend's RG later, though I didn't like its Jumbo Frets.

Haha, wow, Bm is really impossible. Took me a few minutes to finger all strings correctly and sure enough, finger 3 is again straight... :\