Opening theory and the art of bookmaking

Having looked more in detail into 'my' repertoire,
i.e. the opening book(s) i made for Arena it
appears that gradually i'm getting into new theory.

This is because conventional theory, and also
most 'conventional' opening books are based on (top)
GM games. But the deeper you get into a line, the
fewer games there are, after which the theory gets
very dependent on just one or a few games.

The statistics then get unreliable, and it the of
course is interesting to analyze some of the most important/frequent positions with the top engine
Rybka (in the past most computer chess programs,
i.e. 'engines' were positionally not good enough
to make good moves/ evaluations, but with the latest
Rybka 2.3.2 i believe it can be used to make
professional/GM quality evaluations); this sometimes
leads to interesting results, eg. more solid defences
for black in lines such as the closed Ruy Lopez,
Zaitsev or Breyer variations (doing a full minimax
with the old Bookbuilder 3.6 certainly was useful
in such cases, a/o because of transpositions;
but ofcourse much depends then on the
engine evaluation, and the subvariations which
are already in the book, whether played by GM's ,
having been analyzed myself, or being added
as result of computergames, either downloaded
or played myself in some Arena tournaments..)

In some cases i've checked the results against the
latest Rybka book (rybka2.ctg), and in the
Ruy Lopez i found some improvements for black;
with, i must confess, the conclusion that black is ok.

A similar exercise to check my repertoire against
d4 confirmed that black also is ok in this case,
although the defence with the QueensIndian
(against 1.d4 2.c4 3.Nf3!) was most difficult.

So although we cannot say that 1.e4 is the best
move, but for beginners of course it still is
highly recommended.
This also in some ways 'follows' the history
of chess, where initially (19th century) almost
only 1.e4 was played, whereas the more positional
1.d4 (with sometimes some highly complex play
, eg. against the Benko gambit) came
later, i.e. in the 20th century.

Some preliminary conclusions:
------------------
1) conventional chess is a draw (but not dead,
as RJ Fischer who passed away just recently,
claimed in his later years)
2) the repertoire given in my e-book basically
still is correct and can be used both by
beginners as well as more advanced players,
especially if they play against players of almost
equal ability
3) with Rybka analysis the lines have been improved
although i still have to write them down in detail
4) as a result some of the recommended subvariations
eg. against Caro Kann have changed again a bit
5) against weaker players it would be interesting
to develop a gambit repertoire, both for white
(then i still recommend e4) and with black (where
possible); currently i'm in the process of
researching such a repertoire and making a 2nd
Arena 'gambit' book
6) when becoming stronger chess players can
also develop a '3rd' repertoire with 1.d4 also
this will be a tedious task if it is done
in detail, but the spinoff could be it would
be useful against highly tactical (better?)
players; in such a way it might also be
useful to aim for a draw against stronger players
(maybe later i'll make a 3rd Arena book with
d4 for white but i like to do this as thoroughly
as i've done for e4, so it might take a few years..)