Deep position analysis
This function
is used to analyse a specific position. It is very good for
getting deep and detailed analysis of a critical position, and
especially interesting for correspondence players. Deep position
analysis generates a detailed analysis tree for this position.
You can determine how deep and broad the tree should be and
what moves should be included or excluded from the analysis.
Time/depth: The precision of the analysis is determined by time available
per move, or by the fixed calculation depth you allocate. Time
per move is more flexible since it allows the program to go
much deeper in certain positions (e.g., in the endgame). If
on the other hand you are doing the analysis in the background
then fixed depth is better since the analysis will be fully
executed even if the program is only getting very little CPU
resources.
Plus
(root) allows you to add extra time or search depth
to the root position, so that it is analysed more deeply than
positions that occur in the search.
Branching: The branching factors for the 1st, 2nd and 3rd moves
define how many alternative moves are given. The higher the
values, the broader the analysis tree. However, the program
may change the branching factor if it thinks the position merits
that. This is dependent on the evaluation window described below.
If there are moves present after the position, these will always
be considered.
Branching: White, Black, both determines whether alternatives should be
given for one or both sides. Example: you want to show that
in a certain position White is winning by force. Then you are
not too interested in white alternatives and should set branching
for Black only.
Length
of variations: Sets the length of analysed variations.
Evaluation
window: This value, given in 100ths of a pawn, determines
when a variation will be discarded. The value 80, for instance,
means that moves which are 0.8 pawns worse than the best move
will not be investigated any further, even if the branching
factor would allow it.
At the end
of deep position analysis, all the variations that have been
generated are sorted and the strongest moves becomes the main
line.
Note
You can influence the analysis by entering continuations to
the game. These moves and variations will always be taken into
consideration. If you do not enter any moves then the program
is free to look at any lines it thinks are worthwhile.
If you
annotate a move with a "?" then it will not be taken
into consideration. So this is an excellent way to exclude lines
you know will lead to nothing, but which the program would otherwise
analyse extensively.
You can
use more than one engine to analyse a position. The engines
are used in the order in which they are listed – if you
have four engines and two lines then the first two engines will
be used for these.
It is often
better to give let the program analyse many alternatives for
one side only. For instance if you want to know if White can
force a win in a given position you may set a branching factor
only for Black to see if the program can find any defence against
the best white attack.
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