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303 Commits

Author SHA1 Message Date
Marco Costalba
e3af492142 Remove a stale assignment 
No more used after previous patch.

Spotted by Jekaa .

No functional change.
 2016-08-18 10:40:56 +02:00
Stefano80
9585f8ef58 Retire pawn span 
Retire pawn span and replace with pawn count in evaluate_scale_factor.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 26482 W: 4929 L: 4818 D: 16735

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 61938 W: 8400 L: 8335 D: 45203

Bench: 7662861
 2016-08-18 10:16:56 +02:00
Marco Costalba
190d2ea4bc Restore standard passed pawn definition 
Use the usual and accepted passed pawn semantic
instead of a non-standard one and remove a FIXME.

STC (http://tests.stockfishchess.org/tests/view/576401350ebc5972faa1608d):
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 29646 W: 5663 L: 5557 D: 18426

LTC (http://tests.stockfishchess.org/tests/view/5764e4e90ebc5972faa160c3):
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 40224 W: 5578 L: 5484 D: 29162

bench: 7543902
 2016-06-25 11:46:17 +02:00
Stéphane Nicolet
ab0f4c0353 Simplify doubled pawn 
Only use doubled pawn malus when the doubled pawns are on consecutive squares.

Passed STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 7678 W: 1469 L: 1325 D: 4884

And LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 26739 W: 3562 L: 3449 D: 19728

Bench: 8211685
 2016-05-26 12:33:44 +02:00
Stéphane Nicolet
16c603ce9b Double pawn simplification 
Try doubled pawn simplification, with psq
table compensation.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 36094 W: 6558 L: 6463 D: 23073

LTC:
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 102352 W: 13417 L: 13404 D: 75531

Bench: 8716243
 2016-05-13 13:01:59 +02:00
Stéphane Nicolet
2694ef23c3 Isolated pawn simplification 
STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 117822 W: 21697 L: 21744 D: 74381

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 92307 W: 12330 L: 12305 D: 67672

Bench: 8813983

Resolves #659
 2016-04-30 22:23:22 +01:00
Alain SAVARD
29b5842da8 Backward simplication 
On top of the usual conditions
a) some opponent in front (but no lever)
b) some neighbours (in front) (but no neighbour behind or same rank)
c) < rank_5

to find out if a pawn is backward we look at the squares in front of this pawn to reach the same rank as the next neighbour.

In current master, a pawn is backward if any of those squares is controlled by an enemy pawn on an adjacent file

In this version, a pawn is ALSO backward if any of those squares is occupied by an enemy pawn.

STC:
http://tests.stockfishchess.org/tests/view/56fe7efd0ebc59301a3541f1
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 19051 W: 3557 L: 3433 D: 12061

LTC:
http://tests.stockfishchess.org/tests/view/56febc2d0ebc59301a354209
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 40810 W: 5619 L: 5526 D: 29665

Bench: 7525245

Resolves #614
 2016-04-08 19:12:55 +01:00
mstembera
8fb45caade Simplify popcnt 
Also a speedup(about 1%) on 64-bit w/o hardware popcnt

Retire Max15 and Full template parameters
(Contributed by Marco Costalba)

Now that we have just SW and HW versions, use
template default parameter to get rid of explicit
template parameters.

Retire bitcount.h and move the only defined
function to bitboard.h

No functional change

Resolves #620
 2016-04-08 18:52:15 +01:00
fanon
5d1644ba69 Simplify pawns King Safety calculation 
STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 130209 W: 23516 L: 23581 D: 83112

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 33541 W: 4563 L: 4460 D: 24518

Bench: 8644370

Resolves #604
 2016-03-27 20:08:56 +01:00
hxim
56dd58e6f9 Remove Weights 
Removed remaining redundant weights for pawn structure,
passed pawns, space and king safety by redistributing them
into individual evaluation terms.

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 15173 W: 2790 L: 2659 D: 9724

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 43433 W: 5936 L: 5846 D: 31651

Bench: 7156237

Resolves #586
 2016-02-07 21:00:24 +00:00
Lyudmil Antonov
89723339d9 Assorted English grammar changes 
No functional change

Resolves #567
 2016-01-16 21:34:29 +00:00
lucasart
aa31f7f096 Retire CenterBind 
And compensate in the PSQT.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 27714 W: 5161 L: 5052 D: 17501

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 36354 W: 5008 L: 4909 D: 26437

Bench: 8603285

Resolves #556
 2016-01-03 17:33:36 +00:00
Alain SAVARD
1de97337c2 Fine tuning of unsupported pawn penalty 
Adjust the unsupported pawn penalty when the pawn is supporting 2 pawns
(for example g7 in f6-g7-h6)

Passed STC
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 23833 W: 4384 L: 4158 D: 15291

Passed LTC
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 42711 W: 5918 L: 5655 D: 31138

Bench: 8390233

Resolves #549
 2016-01-03 14:15:29 +00:00
ppigazzini
d4af15f682 Update AUTHORS and copyright notice 
No functional change

Resolves #555
 2016-01-02 09:43:51 +00:00
Marco Costalba
9742fb10fd Update Copyright year 
No functional change.

Resolves #554
 2016-01-01 10:17:36 +00:00
Alain SAVARD
6a79d5d10e Correct Pawn Trace Score + Code Clean up 
No functional change

Resolves #542
 2015-12-30 11:30:28 +00:00
Marco Costalba
52eac1e535 Simplify outpost code 
Also inline defintions of SpaceMask and CenterBindMask.

Verified from assembly that compiler computes the values
at compile time, so it is also theoretical faster.

While there factor out scale factor evaluation.

No functional change.
 2015-12-05 11:16:19 +01:00
Stefan Geschwentner
cccf3c815c Bonus for reachable outpost 
Give a bonus for outpost squares which in reach of a bishop or knight.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 22725 W: 4570 L: 4339 D: 13816

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 15019 W: 2333 L: 2157 D: 10529

Bench: 8503181

Resolves #495
 2015-11-14 06:31:45 -08:00
Alain SAVARD
55758344d3 Simplify threats 
Using less parameters and code to compute Threats
Includes also a few spacing edits.

Run as a simplification.

Passed STC 10+0.1
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 18879 W: 3725 L: 3600 D: 11554

Passed LTC 60+0.4
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 74116 W: 11001 L: 10958 D: 52157

bench: 8004751
 2015-10-24 10:08:26 +02:00
Stéphane Nicolet
7ea5659c5f Asymmetry bonus for the attacking side 
Use asymmetry in the position (king separation, pawn structure) to
compute an "initiative bonus" for the attacking side.

Passed STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 14563 W: 2826 L: 2636 D: 9101

And LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 14363 W: 2317 L: 2141 D: 9905

Bench: 8116244

Resolves #462
 2015-10-15 21:27:52 -07:00
Marco Costalba
e6310b3469 Rename Position::list 
Use Position::square and Position::squares instead.

This allow us to remove king_square(), simplify
endgames and to have more naming uniformity.

Moreover, this is a prerequisite step in case
in the future we decide to retire piece lists
altoghter and use pop_lsb() to loop across
pieces and serialize the moves. In this way
we just need to change definition of Position::square
to something like:

template<PieceType Pt> inline
Square Position::square(Color c) const {
  return lsb(byColorBB[c]);
}

No functional change.
 2015-08-04 09:51:06 +02:00
lucasart
5ebdf2f8c8 Tune pawn shelter/storm 
STC
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 31679 W: 6183 L: 5912 D: 19584

LTC
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 43550 W: 6885 L: 6602 D: 30063

Bench: 9219343

Resolves #360
 2015-06-02 12:09:19 -07:00
Stéphane Nicolet
4502a1934f Tweak backward pawns definition 
Advanced pawns cannot be backward. Also lower the backward penalty in
endgame.

Passed STC:
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 18534 W: 3588 L: 3433 D: 11513

and LTC:
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 21319 W: 3415 L: 3217 D: 14687

Bench: 7271152

Resolves #359
 2015-06-02 12:07:02 -07:00
lucasart
8e95c39bfa Simplify backward pawn scoring 
STC

LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 52322 W: 10011 L: 9945 D: 32366

LTC

LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 14143 W: 2334 L: 2203 D: 9606

Bench: 7976423

Resolves #354
 2015-05-27 20:05:20 +01:00
Marco Costalba
6c42575208 Assorted code style of latest commits 
No functional chnage.
 2015-03-29 10:16:10 +02:00
Alain SAVARD
8463fa479e PSV3_1 
Small speed-up in pawn.cpp
Results for 10 tests for each version:

Base      Test      Diff
Mean    1435636   1445238   -9602
StDev   22576     23189     1848

p-value: 1
speedup: 0.007

No functional change

Resolves #295
 2015-03-29 07:30:46 +08:00
lucasart
d477a0d611 connected should be bool, not Bitboard 
There's no reason to define it as a Bitboard, so for consistency, use bool.

This is even a speedup on my machine: i7-3770k, using gcc 4.9.1 (linux):

    stat        test     master    diff
    mean   2,341,338  2,327,998  13,134
    stdev     15,765     14,717   5,405

    speedup       0.56%
    P(speedup>0) 100.0%

No functional change.

Resolves #298
 2015-03-18 20:21:41 +00:00
Marco Costalba
be50952533 Sync with master 
bench: 8285241
 2015-03-07 10:56:01 +01:00
hxim
3017e8c604 Transform minKingPawnDistance into a local variable 
minKingPawnDistance is used only as local variable in one place so we don't need it to be part of "Pawns::Entry" structure.

No functional change.

Resolves #277
 2015-03-07 09:03:19 +00:00
Joona Kiiski
856a5f3aaa Revert C++11 merge 
Restore the state of repo back to commit 'Simplify pawn code a bit' (1e6d21dbb6)

No functional change
 2015-03-07 07:38:22 +00:00
Marco Costalba
0da7295795 Sync with master 
bench: 8285241
 2015-02-28 20:22:28 +01:00
Stéphane Nicolet
1e6d21dbb6 Simplify pawn code a bit 
Simplify a bit the number of bitwise operators used to calculate the
pawn evaluation in pawns.cpp

No functional change.

Resolves #269
 2015-03-01 01:01:37 +08:00
Marco Costalba
2dbb1adf2a Sync with master 
bench: 8069601
 2015-02-26 20:50:39 +01:00
Marco Costalba
8a2c4134a6 Normalize twice supported pawns 
Align codying style to current conventions and move
formula for twice supported pawns to Pawns::init()
where it should be.

No functional change.
 2015-02-27 01:56:16 +08:00
Alain SAVARD
fce799294c Apex Pawns 
Pawns which are supported already have a bonus. Apex are pawns which are
supported twice.
This patch gives an additional 50% bonus for them.

STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 6549 W: 1333 L: 1209 D: 4007

LTC
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 18002 W: 3037 L: 2850 D: 12115

Bench: 8069601

Resolves #267
 2015-02-27 01:52:23 +08:00
Marco Costalba
153fb216a1 Small tweaks in pawns.cpp 
No functional change.
 2015-02-24 11:45:29 +01:00
snicolet
2f46592736 Mobile phalanxes 
Try to create mobile phalanxes

STC:
LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 52393 W: 10912 L: 10656 D: 30825

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 30398 W: 5315 L: 5063 D: 20020

Bench: 8253813

Resolves #261
 2015-02-20 19:56:57 +00:00
Joona Kiiski
e118570038 Pawn Center Bind Bonus 
Bonus for two pawns controlling the same central square

STC:

LLR: 3.14 (-2.94,2.94) [-1.50,4.50]
Total: 15974 W: 3291 L: 3133 D: 9550

LTC:

LLR: 3.24 (-2.94,2.94) [0.00,6.00]
Total: 10449 W: 1837 L: 1674 D: 6938

Idea from Lyudmil Tsvetkov.

Bench: 7699138

Resolves #248
 2015-02-08 19:28:01 +00:00
NicklasPersson
ddccb5355c Improved King Safety values 
From an SPSA-session on king safety.

STC:
ELO: 3.21 +-2.1 (95%) LOS: 99.8%
Total: 40000 W: 8181 L: 7812 D: 24007

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 47765 W: 8091 L: 7785 D: 31889

Bench: 8589262

Resolves #241
 2015-02-03 04:00:52 +08:00
Marco Costalba
a7592e69d7 Fix a MSVC warning 
warning C4805: '|' : unsafe mix of type 'Bitboard' and type 'bool' in operation

No functional change.
 2015-01-31 10:19:00 +01:00
Alain SAVARD
8aa8608c2a Simplify backward pawn definition 
Make use of 'lever' attribute

No functional change

Resolves #234
 2015-01-28 21:29:04 +00:00
NicklasPersson
7837fb2aca King safety tuning with values obtained by SPSA. 
Part I:

LTC:

LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 11529 W: 2075 L: 1882 D: 7572

Part II:

LTC:

ELO: 2.07 +-2.1 (95%) LOS: 97.3%
Total: 34859 W: 5967 L: 5759 D: 23133

Bench: 7374604

Resolves #228
 2015-01-28 21:05:21 +00:00
Marco Costalba
42b48b08e8 Update copyright year 
No functional change.
 2015-01-10 11:46:28 +01:00
Marco Costalba
3fda064a66 Retire one implementation of pop_lsb() 
We have two implementations that are equivalent,
so retire one.

Plus usual tidy up of comments and code reshuffle.

No functional change.
 2015-01-03 22:16:30 +01:00
Marco Costalba
91cc82aa25 Let material probing to access per-thread table 
It is up to material (and pawn) table look up
code to know where the per-thread tables are,
so change API to reflect this.

Also some comment fixing while there

No functional change.
 2015-01-02 21:31:02 +01:00
Stefan Geschwentner
25b492ab58 Big King Safety tuning 
All king safety related terms (shelterweakness, stormdanger,
attackunits, ..) was tuned together. Additionally for attack units a
finer granularity (factor 4) is used.

STC
ELO: 9.22 +-3.1 (95%) LOS: 100.0%
Total: 19514 W: 4340 L: 3822 D: 11352

LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 6399 W: 1192 L: 1056 D: 4151

Bench: 8224782

Resolves #184
 2015-01-03 03:33:02 +08:00
Marco Costalba
6933f05f4b Use score and value consistently 
And other assorted small fixing, code style
tweaks and reshuffles in evaluate.cpp

No functional change.
 2014-12-28 19:06:56 +01:00
Marco Costalba
296534f234 Prefer names to numbers in storm code 
Also replaces some tabs with spaces and
change StormDanger order to reflect
ShelterWeakness one.

No functional change.
 2014-12-22 08:33:07 +01:00
Stefan Geschwentner
3231038262 Big King Safety tuning 
ShelterWeakness and Stormdanger array are now indexed additionally by
file pair (a/h,b/g,c/f,d/e). The special case of king blocking a pawn
is incorporated in the StormDanger array.  Finally the 93 parameters
are tuned by SPSA on LTC.

STC
ELO: 3.46 +-2.2 (95%) LOS: 99.9%
Total: 40000 W: 8275 L: 7877 D: 23848

LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 10311 W: 1876 L: 1721 D: 6714

Bench: 9498821

Resolves #163
 2014-12-21 01:53:44 +08:00
joergoster
f6d220ab14 Halve StormDanger bonus for blocked pawn on A/H file 
STC
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 3410 W: 758 L: 641 D: 2011

LTC
LLR: 2.95 (-2.94,2.94) [0.00,6.00]
Total: 33225 W: 5708 L: 5445 D: 22072

Bench: 8465811

Resolves #153
 2014-12-11 13:08:29 -05:00