It happens that more then 70% of cases are HxL, where
we call see() anyway. The mesured saving of calling
see is about 0,5% of total time, but considering the
added burden in score_captures() the saving is only
0,35% locally and due to more difficult inlining of
the function it ends up that we have no advantage at all,
possibly a small slow down!
So revert.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Does not seem to improve anything.
Anyhow idea is nice, maybe we still have to find
correct recipe.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
EvalInfo has missing attack info when a specialized
endgame function is used.
We missed this case and were using an empty attack bitboard
instead so that no captures were generated for endgames.
After testing the EvalInfo optimization gave worst results,
so after a (long) debug session this nasty bug was found.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Add infrastructure to threat killer moves as a vector,
this will allow us to easily parametrize the number of
killer moves, instead of hardcode this value to two as is now.
This patch just add the infrastructure, no functional
change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Instead of pospone until picking. No functional
change and probably no performance change but it is
needed for following patch.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
More testing is needed and better do not risk
just before release.
Reverted:
Disable LSN filtering as defualt for release
Use MVV/LVA in score_evasions()
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Do not calculate SEE on all the moves in MovePicker::score_captures()
but delay until pick_move_from_list() when only the best ones are
double checked against their see value.
If a beta cut-off occurs then we avoid calculating SEE on all
the moves, but just the picked ones.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
We have a regression somewhere here so restart from zero
and proceed one change at a time.
With this modification we have the same strenght of
"Introduce Stockfish" patch that is our strongest to date.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This fix a couple of dubious bugs in MVV/LVA
ordering.
Tests seems to confirm now is slightly better.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This seems to increase strenght (about 15 ELO),
still to test some variations on this theme that
could increase ELO even more.
Idea from Rebel (http://members.home.nl/matador/chess840.htm)
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Without this patch MSVC crashes when compiled
in release mode. It survives and works as
expected in debug mode and with gcc and Intel
compilers.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
We don't need a full swap here because once found
and returned the best move will not be used again.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
