Why does the か come before です in this question?


I'm looking through a book of [go](http://en.wikipedia.org/wiki/Go_%28game%29)
problems, and ran across the following sentence accompanied by the problem
diagram:

> 隅の黒一子が次にアタリですが、ここをどう考えるかです

A rough translation is relatively simple, along the lines of "Black's single
stone in the corner is 1 move away from atari (technical term), what do you
think about this position?" (By implication: how should black play to
survive?)

The go problem is relatively simple. The bit that confused me was the か
landing before the です in this question. What does this mean and how does it
affect the sentence?




You know that you can use "koto" or "no" or "mono" to nominalize a
proposition, don't you? Well, you can with "ka" as well, when the proposition
is a question, direct or indirect.

For example:

  1. いつ行くか教えてください. "Tell me when you leave." (Which is nothing else than "Xを教えてください" but where you drop the を because of か.)
  2. ポイントは、いつ行くかです。"The point is when you leave." (Which is nothing else than "XはYです".)

