Stockfish Development Versions are build automatically if there are changes on the master branch in the git repository (https://github.com/official-stockfish/Stockfish). Use it at your own risk.
They are compiled with gcc/mingw 7.3 on Ubuntu 18.04.
2.Jan.2016: BMI build now slightly faster due to profiling.
Read the FAQ or leave a comment.

goto Gull
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Author: ElbertoOne
Date: Sat Dec 1 10:29:10 2018 +0100
Timestamp: 1543656550

Remove Overload bonus

Compensate by giving the Hanging bonus to weak doubly-attacked
non pawn enemies pieces.

STC: http://tests.stockfishchess.org/tests/view/5bfd53c40ebc5902bced9237
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 62107 W: 13664 L: 13622 D: 34821 Elo +0.23

LTC: http://tests.stockfishchess.org/tests/view/5bfd74700ebc5902bced9618
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 86406 W: 14381 L: 14365 D: 57660 Elo +0.06

A possible follow up would be to tune the hanging bonus and/or try to
simplify the hanging bonus condition.

Bench: 3810849
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Linux x64
Author: Stéphane Nicolet
Date: Thu Nov 29 16:17:23 2018 +0100
Timestamp: 1543504643

Restore development version

No functional change
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Author: Stéphane Nicolet
Date: Thu Nov 29 15:45:26 2018 +0100
Timestamp: 1543502726

Stockfish 10

Official release version of Stockfish 10.

This is also the 10th anniversary version of the Stockfish project, which
started exactly ten years ago! I wish to extend a huge thank you to
all contributors and authors in our amazing community :-)

Bench: 3939338
Windows x64 for Haswell CPUs
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Windows x64
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Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: Stéphane Nicolet
Date: Thu Nov 29 15:15:43 2018 +0100
Timestamp: 1543500943

Update list of authors

No functional change
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Author: Sebastian Buchwald
Date: Thu Nov 29 15:01:54 2018 +0100
Timestamp: 1543500114

Use emplace_back() in TB code

The patch was tested for correctness by running bench with and
without the change against current master, and the tablebase hit
numbers were found to be identical in both cases. See the pull
request comments for details:
https://github.com/official-stockfish/Stockfish/pull/1826

No functional change.
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Author: 31m059
Date: Tue Nov 27 08:53:14 2018 +0100
Timestamp: 1543305194

Simplify casting extension

On November 16th, before the removal of the depth condition, I tried
revising castling extensions to only handle castling moves, rather than
moves that change castling rights generally. It appeared to be a slight
Elo gain at STC but insufficient to pass [0, 4] (+0.5 Elo), but what I
overlooked was that it made pos.can_castle(us) irrelevant and should
have been a simplification. Recent discussion with @Chess13234 and
Michael Chaly (@Vizvezdenec) inspired me to take a second look, and
the simplification continues to pass when rebased on the current master.

This replaces two conditions with one, because type_of(move) == CASTLING
implies pos.can_castle(Us), allowing us to remove the latter condition.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 110948 W: 24209 L: 24263 D: 62476 Elo -0.17
http://tests.stockfishchess.org/tests/view/5bf8f65c0ebc5902bced3a63

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 88283 W: 14681 L: 14668 D: 58934 Elo +0.05
http://tests.stockfishchess.org/tests/view/5bf994a60ebc5902bced4349

Bench: 3939338
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Linux x64
Author: Steinar H. Gunderson
Date: Tue Nov 27 08:39:23 2018 +0100
Timestamp: 1543304363

Turn on MADV_RANDOM for Syzygy mmaps (on Unix-like builds)

When running on a cloud VM (n1-highcpu-96) with several NVMe SSDs and
some non-SSDs for tablebases, I noticed that the average SSD request size was
more than 256 kB. This doesn't make a lot of sense for Syzygy tablebases,
which have a block size of 32 bytes and very low locality.

Seemingly, the tablebase access patterns during probing make the OS,
at least Linux, think that readahead is advantageous; normally, it
gives up doing readahead if there are too many misses, but it doesn't,
perhaps due to the fairly high overall hit rates. (It seems the kernel cannot
distinguish between reading a block that was paged in because the userspace
wanted it explicitly, and one that was read as part of readahead.)

Setting MADV_RANDOM effectively turns off readahead, which causes
the request size to drop to 4 kB. In the aforemented cloud VM test,
this roughly tripled the amount of I/O requests that were able to go
through, while reducing the total traffic from 2.8 GB/sec to 56 MB/sec
(moving the bottleneck to the non-SSDs; it seems the SSDs could have
sustained many more requests).

Closes https://github.com/official-stockfish/Stockfish/pull/1829

No functional change.
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Author: Jörg Oster
Date: Sun Nov 25 11:27:40 2018 +0100
Timestamp: 1543141660

Qsearch simplification. (#1828)

Don't do an extra TT update in case of a fail-high,
but simply break off the moves loop and let the TT update
at the end of qsearch do this job.
Same workflow/logic as in our main search function now.

Tested for no regression to be on the safe side.
STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 30237 W: 6665 L: 6560 D: 17012 Elo +1.21
http://tests.stockfishchess.org/tests/view/5bf928e80ebc5902bced3f3a

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 51067 W: 8625 L: 8553 D: 33889 Elo +0.49
http://tests.stockfishchess.org/tests/view/5bf937180ebc5902bced3fdc

No functional change.
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Author: Vizvezdenec
Date: Sat Nov 24 02:14:18 2018 +0100
Timestamp: 1543022058

Reintroduce tropism to kingdanger

Tropism in kingdanger was simplified away in this pull request #1821.
This patch reintroduces tropism in kingdanger with using quadratic scaling.

Passed STC http://tests.stockfishchess.org/tests/view/5bf7c1b10ebc5902bced1f8f
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 52803 W: 11835 L: 11442 D: 29526 Elo +2.59

Passed LTC http://tests.stockfishchess.org/tests/view/5bf816e90ebc5902bced24f1
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 17204 W: 2988 L: 2795 D: 11421 Elo +3.90

How do we continue from there?

I've recently tried to introduce tropism difference term in kingdanger which
passed STC 6 times but failed LTC all the time. Maybe using quadratic scaling
for it will also be helpful.

Bench 4041387
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Author: 31m059
Date: Sat Nov 24 02:09:35 2018 +0100
Timestamp: 1543021775

Remove the tropism term from kingDanger

A recent LTC tuning session by @candirufish showed this term decreasing significantly. It appears that it can be removed altogether without significant Elo loss.

I also thank @GuardianRM, whose attempt to remove tropism from king danger inspired this one.

After this PR is merged, my next step will be to attempt to tune the coefficients of this new, simplified kingDanger calculation.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 12518 W: 2795 L: 2656 D: 7067 Elo +3.86
http://tests.stockfishchess.org/tests/view/5befadda0ebc595e0ae3a289

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 164771 W: 26463 L: 26566 D: 111742 Elo -0.22
http://tests.stockfishchess.org/tests/view/5befcca70ebc595e0ae3a343

LTC 2, rebased on Stockfish 10 beta:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 75226 W: 12563 L: 12529 D: 50134 Elo +0.16
http://tests.stockfishchess.org/tests/view/5bf2e8910ebc5902bcecb919

Bench: 3412071
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Author: Joost VandeVondele
Date: Tue Nov 20 08:00:19 2018 +0100
Timestamp: 1542697219

Force time check on TB probe in search.

Because of aggressive time management and optimistic assumptions
about move overhead, it's still very easy to get Stockfish to forfeit
on time when we hit an endgame and have Syzygy EGTB on a spinning
drive. The latency from serving a few thousand EGTB probes (~10ms each),
of which there can currently be up to 4000 outstanding before a time
check, will easily overwhelm the default Move Overhead of 30ms.

This problem was first raised by Gian-Carlo Pascutto and some solutions
and improvements were discussed in the following pull requests:
https://github.com/official-stockfish/Stockfish/pull/1471
https://github.com/official-stockfish/Stockfish/pull/1623
https://github.com/official-stockfish/Stockfish/pull/1783

This patch is a minimal change proposed by Marco Costalba to lower
the impact of the bug. We now force a check of the clock right after
each tablebase read.

No functional change.
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Author: xoto10
Date: Tue Nov 20 07:50:12 2018 +0100
Timestamp: 1542696612

Bonus for restricting opponent's piece moves

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 51883 W: 11297 L: 10915 D: 29671 Elo +2.56
http://tests.stockfishchess.org/tests/view/5bf1e2ee0ebc595e0ae3cacd

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 15859 W: 2752 L: 2565 D: 10542 Elo +4.10
http://tests.stockfishchess.org/tests/view/5bf337980ebc5902bcecbf62

Notes:

(1) The bonus value has not been carefully tested, so it may be possible
to find slightly better values.

(2) Plan is to now try adding similar restriction for pawns. I wanted to
include that as part of this pull request, but I was advised to do it as
two separate pull requests. STC is currently running here, but may not add
enough value to pass green.

Bench: 3679086
Windows x64 for Haswell CPUs
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Author: Stéphane Nicolet
Date: Mon Nov 19 11:18:21 2018 +0100
Timestamp: 1542622701

Stockfish 10-beta

Preparation commit for the upcoming Stockfish 10 version, giving a chance to catch last minute feature bugs and evaluation regression during the one-week code freeze period. Also changing the copyright dates to include 2019.

No functional change
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Author: SFisGOD
Date: Mon Nov 19 10:50:55 2018 +0100
Timestamp: 1542621055

Tweak Queen PSQT based on tuned values

STC: (Yellow)
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 63140 W: 13433 L: 13353 D: 36354 Elo +0.44
http://tests.stockfishchess.org/tests/view/5bed42c90ebc595e0ae37cf5

LTC: (Green)
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 47714 W: 7785 L: 7485 D: 32444 Elo +2.18
http://tests.stockfishchess.org/tests/view/5bec3b8c0ebc595e0ae36dec

Closes https://github.com/official-stockfish/Stockfish/pull/1816

Bench: 3717396
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Linux x64
Author: Kurt
Date: Mon Nov 19 10:42:46 2018 +0100
Timestamp: 1542620566

Tune evaluation scores

STC:
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 84697 W: 18173 L: 18009 D: 48515 Elo +0.67
http://tests.stockfishchess.org/tests/view/5bea366f0ebc595e0ae34793

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 157625 W: 25533 L: 24893 D: 107199 Elo +1.41
http://tests.stockfishchess.org/tests/view/5be8b69e0ebc595e0ae33024

Personally, I feel like SF has been tuned to death recently and that we
need to step away from existing-parameter tunes for a bit and focus more
on new ideas. I don't really think there's much more ELO in these tunes
(for now). For me at least, this was the last existing-parameter tune I'll
be running for quite a while. Cheers!

Bench: 3572567
Windows x64 for Haswell CPUs
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Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: protonspring
Date: Mon Nov 19 10:37:34 2018 +0100
Timestamp: 1542620254

Remove BlockedStorm array

Apparently, only RANK_3 is relevant. This removes a look-up and the
BlockedStorm array, but adds another conditional.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 84340 W: 18054 L: 18054 D: 48232 Elo +0.00
http://tests.stockfishchess.org/tests/view/5bea10f40ebc595e0ae3457b

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 31874 W: 5135 L: 5032 D: 21707 Elo +1.12
http://tests.stockfishchess.org/tests/view/5beadb6a0ebc595e0ae35542

Closes https://github.com/official-stockfish/Stockfish/pull/1814

Bench: 3799443
Windows x64 for Haswell CPUs
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Linux x64
Author: VoyagerOne
Date: Mon Nov 19 10:28:55 2018 +0100
Timestamp: 1542619735

Simplify Castle Extension

Remove depth condition in castle extension, also don't extend if
Singular Extension and Check Extansion fail to extend.

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 42070 W: 9118 L: 9036 D: 23916 Elo +0.68
http://tests.stockfishchess.org/tests/view/5be899cc0ebc595e0ae32f07

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 78278 W: 12490 L: 12458 D: 53330 Elo +0.14
http://tests.stockfishchess.org/tests/view/5be8ac420ebc595e0ae33010

Bench: 3611041
Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: protonspring
Date: Mon Nov 19 10:16:07 2018 +0100
Timestamp: 1542618967

Code style in search.cpp

It does not appear to be not necessary or advantageous to
conditionally initialize kingRing[Us] or kingAttackersCount[Them],
so the 'else' can be removed.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 22873 W: 4923 L: 4804 D: 13146 Elo +1.81
http://tests.stockfishchess.org/tests/view/5be9a8270ebc595e0ae33c7e

No functional change
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Author: Nikolay Kostov
Date: Mon Nov 19 10:10:47 2018 +0100
Timestamp: 1542618647

Update a comment in the evaluate.cpp file to reflect recent change

No functional change
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Author: SFisGOD
Date: Mon Nov 19 10:02:31 2018 +0100
Timestamp: 1542618151

Rook PSQT Tuned

Failed STC (Yellow )
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 56302 W: 12007 L: 11953 D: 32342 Elo +0.33
http://tests.stockfishchess.org/tests/view/5be69d210ebc595e0ae3185b

Passed 1st LTC (Green)
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 8745 W: 1480 L: 1301 D: 5964 Elo +7.11
http://tests.stockfishchess.org/tests/view/5be682960ebc595e0ae31818

Failed 2nd LTC (Red)
LLR: -2.96 (-2.94,2.94) [0.00,4.00]
Total: 19398 W: 3040 L: 3133 D: 13225 Elo -1.67
http://tests.stockfishchess.org/tests/view/5be69b840ebc595e0ae31856

Passed 3rd LTC (Green)
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 107516 W: 17342 L: 16858 D: 73316 Elo +1.56
http://tests.stockfishchess.org/tests/view/5bea879a0ebc595e0ae34d80

Closes https://github.com/official-stockfish/Stockfish/pull/1809

How to continue from there?

The values in the rook table now look a bit strange for a human eye
and are hard to explain, maybe it would be nice to simplify them
by hand and see if we can pass another (clean) double green with a
more regular array.

Bench: 3188070
Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: Vizvezdenec
Date: Mon Nov 19 09:47:19 2018 +0100
Timestamp: 1542617239

Change default contempt from 21 to 24 centipawns

To top the rating lists and get more interesting middle play, it
is a good habit to set the default contempt to the highest value
that does not regress against contempt=0. We recently decreased
PawnValueEg it is logical that to raise a little bit the default
higher contempt because of the following internal dependency in
line 334 of search.cpp :

````
int ct = int(Options["Contempt"]) * PawnValueEg / 100; // From centipawns
````

STC: contempt=24 passed non-regression vs contempt=0
http://tests.stockfishchess.org/tests/view/5bd6d7f80ebc595e0ae21e14

LTC: contempt=24 passed non-regression LTC vs contempt=0
http://tests.stockfishchess.org/tests/view/5bd6e0980ebc595e0ae21f07

On 2018-11-01, we also tested the effects of contempt=21 and contempt=24
against Stockfish 9, and the net result was neutral:

Contempt 21
ELO: 51.68 +-1.9 (95%) LOS: 100.0%
Total: 40000 W: 9487 L: 3581 D: 26932 Elo +51.68
http://tests.stockfishchess.org/tests/view/5bdb1a140ebc595e0ae2620a

Contempt 24
ELO: 52.21 +-2.0 (95%) LOS: 100.0%
Total: 40000 W: 9759 L: 3793 D: 26448 Elo +52.21
http://tests.stockfishchess.org/tests/view/5bdb1b680ebc595e0ae2620d

Bench: 3459874
Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
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Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: Nooby
Date: Mon Nov 19 09:40:42 2018 +0100
Timestamp: 1542616842

Clear TableBase mappings in Search::clear()

This patch will make possible to free mapped TB files with "ucinewgame" command.

We wrote this patch specifically to address a problem that arose while
running Stockfish with 7-piece tablebases as a kibitzer at TCEC for
extended periods of time across multiple games. It was noted that after
some time, the NPS of the kibitzing Stockfish (which is usually 3x faster
than the Stockfish actually competing) would drop precipitously, eventually
falling to preposterously low numbers until restarted.

Their eval bot basically inputs FEN, go infinite, stop and loop, it probably
didn't do ucinewgame either. As time goes it gradually slowed down and OS
starts to use swap, this is not reasonable since the engine only uses 16GB
hash and the machine has 1TB physical RAM and does nothing else.

Author : noobpwnftw

Closes https://github.com/official-stockfish/Stockfish/pull/1790

No functional change.
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Author: protonspring
Date: Mon Nov 12 20:33:07 2018 +0100
Timestamp: 1542051187

Replace the PassedDanger array by an equation

This equation seems to do as well as the current PassedDanger array.

Master values were: 3, 7, 11, 20
The new values given by the equation are: 3, 6, 11, 18

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 84301 W: 18155 L: 18156 D: 47990 Elo -0.00
http://tests.stockfishchess.org/tests/view/5bda03180ebc595e0ae2518e

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 7940 W: 1358 L: 1217 D: 5365 Elo +6.17
http://tests.stockfishchess.org/tests/view/5bdc69880ebc595e0ae27d28

We stopped a LTC run after 70000 games:
LLR: 0.74 (-2.94,2.94) [0.00,4.00]
Total: 70257 W: 11319 L: 11064 D: 47874 Elo +1.26
http://tests.stockfishchess.org/tests/view/5bdca8420ebc595e0ae281a9

Bench: 3913185
Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: mstembera
Date: Mon Nov 12 19:45:05 2018 +0100
Timestamp: 1542048305

Remove redundant king square parameter

We don't need to pass the king square as an explicit parameter to the functions
king_safety() and do_king_safety() since we already pass in the position.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 69686 W: 14894 L: 14866 D: 39926 Elo +0.14
http://tests.stockfishchess.org/tests/view/5be84ac20ebc595e0ae3283c

No functional change.
Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: 31m059
Date: Sun Nov 11 22:14:28 2018 +0100
Timestamp: 1541970868

Simplify tropism. (#1807)

We calculate tropism as a sum of two factors. The first is the number of squares in our kingFlank and Camp that are attacked by the enemy; the second is number of these squares that are attacked twice. Prior to this commit, we excluded squares we defended with pawns from this second value, but this appears unnecessary. (Doubly-attacked squares near our king are still dangerous.) The removal of this exclusion is a possible small Elo gain at STC (estimated +1.59) and almost exactly neutral at LTC (estimated +0.04).

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 20942 W: 4550 L: 4427 D: 11965 Elo +2.04
http://tests.stockfishchess.org/tests/view/5be4e0ae0ebc595e0ae308a0

LTC:
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 56941 W: 9172 L: 9108 D: 38661 Elo +0.39
http://tests.stockfishchess.org/tests/view/5be4ec340ebc595e0ae30938

Bench: 3813986

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