Opening books for 19x19 very limited usefulness because the board is so big.
  You are out of book after just a couple of moves.  It could be used to
place the first stone and have an instant response to the first stone the
opponent places but it's not likely to take you farther than that.

In 9x9 it could be critical as you could cover most reasonable plays to a
modest depth.    In 7x7 you could almost have a book that plays the toughest
part of the game for you.

Don



On Mon, Jul 11, 2011 at 8:13 AM, Hendrik Baier <[email protected]
> wrote:

> Good morning,
>
> I'm sorry I have to repeat my question: Can anyone point me to a paper on
> opening books in 19x19 Go? Or have you seen only cosmetic improvements by
> using them, but no strength improvements?
> It would be great if some of you program authors could give a one-line
> answer on that.
>
> best regards,
> Hendrik Baier
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