What is the ruling on concentrated grape juice? Is it considered alcohol?

Fatwa, posted 4.22.2010, from Iraq, in:
Religious Authority: 
Ali al-Sistanti
Fatwa Question or Essay Title: 
What is the ruling on concentrated grape juice? Is it considered alcohol?

If it boils but two thirds of it does not evaporate, then it is not permissible to drink.

ماحکم عصیر العنب المکثف هل یعتبر من الکحول؟ إذا غلی ولم یذهب ثلثاه فلایجوز شربه.