Instead of crafting a clever formula to calculate the array offset, simply use a
3 dimensional array. Remove the comment while at it, because now the code is
self-documenting.
No functional change.
Resolves#344
Use symmetry along vertical middle axis of the board
to reduce the number of parameters.
For instance psqt value of SQ_A5 == SQ_A4 and value of
SQ_F8 == SQ_F1.
This is always true, at least until now nobody came in
with an asymmetric psqt table that worked.
Original patch by Lucas.
No functional change.
Easier for tuning psq tables:
TUNE(myParameters, PSQT::init);
Also move PSQT code in a new *.cpp file, and retire the
old and hacky psqtab.h that required to be included only
once to work correctly, this is not idiomatic for a header
file.
Give wide visibility to psq tables (previously visible only
in position.cpp), this will easy the use of psq tables outside
Position, for instance in move ordering.
Finally trivial code style fixes of the latest patches.
Original patch of Lucas Braesch.
No functional change.
