I'm not sure either, but perhaps "one-handed"? Having the name Alfonso Nava at the end like that makes me think maybe he is the author or the presenter? Are you sure the punctuation is correct, and that his name is not meant to be on a separate line?
I found the original press release - and there is a 'by' (By Alfons Nava) missing from my title.
So that's where the confusion arose. SoI am guessing he is a solo virtuoso - he doesn't play with one hand...
I have seen him play - on you tube - and he doesn't play with one hand and I would have thought playing with one hand would be impossible in a guitar - unless it means he plays the frets only and gets a sound out - but i don't know
I bow to your superior Spanish - so I will investigate further
I found a clip of him playing with 1 hand on the fret board absolutely amazing sound.
thanks very much for forcing me to investigate this a lot more - my understanding would have been completely wrong
Thanks very much