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Author SHA1 Message Date
Marco Costalba
279ed7ed48 Quiet a warning on Intel compiler 
Plus usual trailing whitespace noise.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:55:43 +02:00
Marco Costalba
af6571856e Shrink arguments in move generation functions 
Perhaps no speedup, but it is more readable.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:21 +02:00
Marco Costalba
0c8659721f Fix a bug in king discoveries checks 
Introduced in "Add a generate_piece_checks() specialization for the king"

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:20 +02:00
Marco Costalba
5dc2312121 Update copyright info 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:20 +02:00
Marco Costalba
aa94f2f4c2 Last little touches to movegen 
No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:19 +02:00
Marco Costalba
d7161c1ce6 Rename PawnOffsets in PawnParams 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:19 +02:00
Marco Costalba
e2af0e775b Pawn move generator: dispatch at compile time 
Instead of function pointers use templates to
dispatch shift operations.

It is more clear and possibly also faster because
branches are removed at compile time.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:19 +02:00
Marco Costalba
ad1bb084dd Start to templetize pawn move generators 
Still very soft, we will see if compiler is
enough or we need more aggressive templetization.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:18 +02:00
Marco Costalba
760f77872f Remove Positions::xxx_count() functions 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:18 +02:00
Marco Costalba
257689dec7 Remove white/black_pawn_attacks_square() 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:18 +02:00
Marco Costalba
ff211469ba Templetize Position::xxx_attacks_square() 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:17 +02:00
Marco Costalba
d4f14a8e83 Remove Position::xxx_list() functions 
No useful, only obfuscating.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:17 +02:00
Marco Costalba
7eb290a509 Add a generate_piece_checks() specialization for the king 
Also reshuffle the code a bit.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:17 +02:00
Marco Costalba
d316b02771 Remove white/black_pawn_attacks() 
Unuseful syntactic sugar, obfuscates the
real code.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:17 +02:00
Marco Costalba
d9e54ceaa1 Prefer template to name decoration 
This also allows faster code although bigger.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:16 +02:00
Marco Costalba
691de79eaa Fix a missing comma in BenchmarkPositions[] 
An old bug introduced in 3e0dc9ee84 almost
one month ago.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:16 +02:00
Marco Costalba
3f38cca072 Position::is_ok()give more info on failed test 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:16 +02:00
Marco Costalba
6b8a07eccc Fix an assert due to a missing parentesis 
Bitwise operators precedence issue here, was
causing an assert.

This is a fallout from recent patches.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:15 +02:00
Marco Costalba
8e85aa3a65 Final semplification of generate_evasions() 
Now it's readable!

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:15 +02:00
Marco Costalba
4f18528a1c Introduce generate_piece_blocking_evasions() 
Start to simplify generate_evasions

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:15 +02:00
Marco Costalba
4a4d62da13 Space inflate generate_evasions() 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-20 21:47:15 +02:00
Marco Costalba
72289fcfab movegen: Introduce generate_pawn_noncaptures() 
This is the last of pawn moves generators converted
to new unified form.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:35 +02:00
Marco Costalba
73d0d2c0b2 movegen: Introduce generate_pawn_captures() 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:35 +02:00
Marco Costalba
c1257d45b2 movegen: Fix just introduced move counter bug 
This is what happens when you don't tests your patches !!

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:35 +02:00
Marco Costalba
34a515f20b movegen: Introduce generate_pawn_checks() 
This greatly simplify redundant code.

Perhaps slihtly slower. Test needed.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:35 +02:00
Marco Costalba
5abe8a0816 generate_checks: fix a bug in black double pawn push 
It was written pos.black_pawn_attacks(ksq) instead of
pos.white_pawn_attacks(ksq)

Updated to the undrlying pos.pawn_attacks(WHITE, ksq)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:34 +02:00
Marco Costalba
35fd5ce5bc Space inflate generate_castle_moves() 
No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:34 +02:00
Marco Costalba
146bb2dfa7 Unify pieces check generation with generate_piece_checks() 
Could be slower: test needed!

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:34 +02:00
Marco Costalba
ea16985ea5 Do not special case generate_king_moves() 
Teoretically a little slowdown. If after testing we
verify the slowdown has impact on ELO we revert the
change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:34 +02:00
Marco Costalba
3b857d1625 Use a const pointer-to-member array for attacks 
Allow the compiler to optimize member
function access.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:34 +02:00
Marco Costalba
aa7121297d Use pointer-to-members to remove a bunch of duplicated code 
Remove all generate_XXX_moves() functions, use an array
of pointer to members instead.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:34 +02:00
Marco Costalba
94f1b31484 movegen: revert see ordering in score_captures() 
It works better with MVV ordering.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:33 +02:00
Marco Costalba
c852a94009 Movegen: further simplify generate_move_if_legal 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:33 +02:00
Marco Costalba
8be2c483a1 Unify black and white code in generate_move_if_legal() 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:33 +02:00
Marco Costalba
158911425b Space inflate movegen.cpp 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:33 +02:00
Marco Costalba
cf8ee79b76 Movepick: add and use find_best_index() helper 
This removes a bunch of redundant code.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:33 +02:00
Marco Costalba
06d6468ce9 Test with see 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:33 +02:00
Marco Costalba
173ecc0acf Use MVV to score captures when see >=0 
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>
 2008-10-18 21:35:32 +02:00
Marco Costalba
2943e1ca31 MovePicker: use const reference instead of pointers 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:32 +02:00
Marco Costalba
486ec580f9 Space inflate movepick.cpp 
Also added some FIXME to dubious points.

Still no functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:32 +02:00
Marco Costalba
a930aafce0 Better comment previous patch 
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:32 +02:00
Marco Costalba
b3744eb4d0 Always add psqt scoring 
When there is also history, history is always
preferred.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:32 +02:00
Marco Costalba
a03ab94f44 Shortcut sorting when no move is in history 
An alternative algorithm to psqt scoring.

Still unclear what is the best, more tests needed.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-18 21:35:20 +02:00
Marco Costalba
644db060ae Add psqt ordering when there is no history 
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>
 2008-10-15 07:18:05 +01:00
unknown
cb76e4a814 Introduce Stockfish 
Signed-off-by: unknown <Marco@.(none)>
 2008-10-13 22:45:47 +01:00
Marco Costalba
d8268024a9 Implement Last Seconds Noise (LSN) filtering 
When an engine is in deep trouble at few
seconds from time limit then giveup without
fighting anymore.

This is used to reduce "lucky draws" and time pressure
blunders noises that can obfuscate results during tests
blitz games (typical one minute games).

Goal of this technique is to reduce number of matches
needed to reliably prove then an engine A is stronger
then an opponent B.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-13 20:40:48 +02:00
Marco Costalba
4fa5dd4db5 Add a second margin to razoring 
Razor on ply one if the advantage is more then a pawn,
the only way to gap the advantage is to capture, so
go directly in quiesce.

This seems to have a positive effect.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-13 20:40:47 +02:00
Marco Costalba
58c7a5c477 Workaround a static data member bug in MSVC 
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>
 2008-10-13 20:40:47 +02:00
Marco Costalba
3901affb1d Yet another pop_1st_bit() optimization 
Always for 32 bit but withot relying on MSVC intrinsics.

It is very similar to previous ones, but this does not
segfaults due to -fno-strict-aliasing compiler option.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-12 14:34:54 +02:00
Marco Costalba
a6017aa728 Add mean calculation in debug tools 
Another simple performance counter...

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
 2008-10-11 19:25:16 +02:00