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There are various ways to obtain detailed information about the influence computations. Colored diagrams showing influence are possible from a colored xterm or rxvt window.
There are two options controlling when to generate diagrams:
Show diagrams for the initial influence computation. This is done
twice, the first time before make_dragons()
is run and the second time
after. The difference is that dead dragons are taken into account the
second time. Tactically captured worms are taken into account both
times.
Show influence diagrams after the move at the given location. An important limitation of this option is that it's only effective for moves that the move generation is considering.
The other options control which diagrams should be generated in these situations. You have to specify at least one of the options above and at least one of the options below to generate any output.
The options below must be combined with one of the two previous ones, or the diagram will not be printed. For example to print the influence diagram, you may combine 0x08 and 0x010, and use the option -m 0x018.
Show colored display of territory/moyo/area regions.This feature is very useful to get an immediate impression of the influence regions as GNU Go sees them.
- territory: cyan
- moyo: yellow
- area: red
Show numerical influence values for white and black. These come in two separate diagrams, the first one for white, the second one for black. Notice that the influence values are represented by floats and thus have been rounded in these diagrams.
This generates two diagrams showing the permeability for black and white influence on the board.
This shows the strength of the influence sources for black and white across the board. You will see sources at each lively stone (with strength depending on the strength of this stone), and sources contributed by patterns.
This shows the attenuation with which the influence sources spread influence across the board. Low attenuation indicates far-reaching influence sources.
This shows the territory valuation of GNU Go. Each intersection is shown with a value between -1.0 and +1.0 (or -2 resp. +2 if there is a dead stone on this intersection). Positive values indicate territory for white. A value of -0.5 thus indicates a point where black has a 50% chance of getting territory.
Finally, there is the debug option -d 0x1 which turns on
on DEBUG_INFLUENCE
. This gives a message for each influence pattern
that gets matched. Unfortunately, these are way too many messages making
it tedious to navigate the output. However, if you discover an influence
source with -m 0x80 that looks wrong, the debug output can
help you to quickly find out the responsible pattern.