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Stockfish Polyglot - Page 2 Empty Asking for explanation between several variants

Post  kazimirovich on Wed Feb 13, 2019 12:56 pm

Hello, first all all thx for this thread.

I have no idea on what are the differences between geral varial, modern, etc.

If someone could explain would be great. Thx in advance.

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Post  kramnik on Sat Feb 23, 2019 1:34 am

I guess it's all related to the computer and the processor you have: for Haswells use BMI2, for Xeons use POPCNT, for new cpus use MODERN, for old computers use OLD, et cetera.

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Post  kramnik on Sat Feb 23, 2019 5:10 pm

Stockfish Polyglot 2019-02-23.

This distribution is the expansion of Stockfish beta having timestamp: 1549618288 - Add KNNvKP Endgame Heuristic.

Author: Kurtbusch
Date: Thu Feb 21 19:53:03 2019 +0100
Timestamp: 1550775183

Add KNNvKP Endgame Heuristic

This is a somewhat different patch. It fixes blindspots for two knights vs pawn endgame.

With local testing starting from random KNNvKP positions where the pawn has not advanced beyond the 4th rank (thanks @protonspring !) at 15+0.15 (4 cores), this went +105=868-27 against master. All except two losses were won in reverse.

The heuristic is simple but effective - the strategy in these endgames is to push the opposing king to the corner, then move the knight that's blocking the pawn in for the checkmate while the pawn is free to move and prevents stalemate. This patch gives SF the little boost it needs to search the relevant king-cornering mating lines.

See the discussion in pull request 1939 for some more good results for this test in independant tests:
https://github.com/official-stockfish/Stockfish/pull/1939%22

Bench: 3310239


Author: MJZ1977
Date: Thu Feb 21 19:36:48 2019 +0100
Timestamp: 1550774208

ProbCutCount limit dependancy to cutNode

Use the ProbCutCount limit `2 + 2 * cutNode` instead of constant 3.

STC
LLR: -2.95 (-2.94,2.94) [0.50,4.50]
Total: 61812 W: 13599 L: 13459 D: 34754 Elo +0.79
http://tests.stockfishchess.org/tests/view/5c6d19240ebc5925cffca07a%22

LTC LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 27549 W: 4614 L: 4363 D: 18572 Elo +3.17
http://tests.stockfishchess.org/tests/view/5c6d45c10ebc5925cffca7a6%22

Closes https://github.com/official-stockfish/Stockfish/pull/2015%22 .

Bench: 3368889

Author: protonspring
Date: Thu Feb 21 19:24:02 2019 +0100
Timestamp: 1550773442

Remove PvNode dimension from Reductions array

This is a functional simplification: if we simply subtract one to Reductions[]
when PvNode is set, we can remove this dimension of the multidimensional array.
I think this saves about 8K of memory.

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 10118 W: 2282 L: 2138 D: 5698 Elo +4.95
http://tests.stockfishchess.org/tests/view/5c6332b60ebc5925cffbdfed%22

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 70765 W: 11617 L: 11575 D: 47573 Elo +0.21
http://tests.stockfishchess.org/tests/view/5c63379e0ebc5925cffbe0de%22

Closes https://github.com/official-stockfish/Stockfish/pull/2010%22 .

Bench 3261078

Author: protonspring
Date: Thu Feb 21 19:18:02 2019 +0100
Timestamp: 1550773082

Remove skipQuiets variable in search()

This is a functional simplification. The moveCountPruning variable and the skipQuiets variable are similar enough in function that they can be combined. This removes the skipQuiets variable in search.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 23278 W: 5210 L: 5091 D: 12977 Elo +1.78
http://tests.stockfishchess.org/tests/view/5c65dc490ebc5925cffc12e9%22

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 77107 W: 12792 L: 12761 D: 51554 Elo +0.14
http://tests.stockfishchess.org/tests/view/5c65e4360ebc5925cffc1490%22

Closes https://github.com/official-stockfish/Stockfish/pull/2011%22 .

bench 3640330


Binaries of the latest version:

Windows:

- Stockfish_Polyglot_2019-02-23_32bit.exe
- Stockfish_Polyglot_2019-02-23_32bit_general.exe
- Stockfish_Polyglot_2019-02-23_32bit_old.exe
- Stockfish_Polyglot_2019-02-23_32bit_popc.exe
- Stockfish_Polyglot_2019-02-23_x64.exe
- Stockfish_Polyglot_2019-02-23_x64_bmi2.exe
- Stockfish_Polyglot_2019-02-23_x64_general.exe
- Stockfish_Polyglot_2019-02-23_x64_modern.exe
- Stockfish_Polyglot_2019-02-23_x64_popc.exe


Linux:

- Stockfish_Polyglot_2019-02-23_32bit
- Stockfish_Polyglot_2019-02-23_32bit_general
- Stockfish_Polyglot_2019-02-23_32bit_old
- Stockfish_Polyglot_2019-02-23_32bit_popc
- Stockfish_Polyglot_2019-02-23_x64
- Stockfish_Polyglot_2019-02-23_x64_bmi2
- Stockfish_Polyglot_2019-02-23_x64_general
- Stockfish_Polyglot_2019-02-23_x64_modern
- Stockfish_Polyglot_2019-02-23_x64_popc

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Post  kazimirovich on Mon Feb 25, 2019 7:34 pm

kramnik wrote:I guess it's all related to the computer and the processor you have: for Haswells use BMI2, for Xeons use POPCNT, for new cpus use MODERN, for old computers use OLD, et cetera.

Great, thx for the information. Guess I have to use the modern one, as I have an AMD Athlon X4 860K Quad Core Processor. Pls, correct me if I'm wrong.

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Post  kramnik on Mon Feb 25, 2019 7:37 pm

No, you are right.

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Post  kramnik on Thu Mar 07, 2019 10:08 am

Stockfish Polyglot: Updated March, 7 2019

- Matching official Stockfish beta having timestamp : 1549618288 - Add KNNvKP Endgame Heuristic. - ONLY FOR WINDOWS! NO LINUX, NO ANDROID, NO MACOS.

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Post  kramnik on Fri Mar 29, 2019 4:09 am

Stockfish Polyglot: Updated March, 29 2019.

Changelog:

This distribution is the expansion of Stockfish beta having timestamp: 1553445685 - Simplify pawn asymmetry (remove use of semiopen files). (#2054)

This is a functional simplification.

To me, the exclusive OR of semiopenFiles here is quite convoluted. Looks like it can be removed.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 43885 W: 9731 L: 9653 D: 24501 Elo +0.62
http://tests.stockfishchess.org/tests/view/5c9041680ebc5925cfff10ea

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 68437 W: 11577 L: 11533 D: 45327 Elo +0.22
http://tests.stockfishchess.org/tests/view/5c9101740ebc5925cfff1cbf

bench 3575627

Author: Joost VandeVondele
Date: Sun Mar 24 17:40:29 2019 +0100
Timestamp: 1553445629

Remove unneeded condition. (#2057)

This is covered by the line just before. If we would like to protect
against the piece value of e.g. a N == B, this could be done by an
assert, no need to do this at runtime.

No functional change.

Author: protonspring
Date: Sun Mar 24 17:37:38 2019 +0100
Timestamp: 1553445458

Simplify Passed Pawns (#2058)

This is a non-functional simplification/speedup.

The truth-table for popcount(support) >= popcount(lever) - 1 is:
------------------lever
------------------0-------1---------2
support--0------X-------X---------0
-----------1------X-------X---------X
-----------2------X-------X---------X

Thus, it is functionally equivalent to just do: support || !more_than_one(lever) which removes the expensive popcounts and the -1.

Result of 20 runs:
base (...h_master.exe) = 1451680 +/- 8202
test (./stockfish ) = 1454781 +/- 8604
diff = +3101 +/- 931

STC
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 35424 W: 7768 L: 7674 D: 19982 Elo +0.92
Http://tests.stockfishchess.org/tests/view/5c970f170ebc5925cfff5e28

No functional change.

Author: xoto10
Date: Wed Mar 20 14:57:34 2019 +0100
Timestamp: 1553090254

Remove !extension check #2045

While looking at pruning using see_ge() (which is very valuable)
it became apparent that the !extension test is not adding any
value - simplify it away.

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 56843 W: 12621 L: 12569 D: 31653 Elo +0.32
http://tests.stockfishchess.org/tests/view/5c8588cb0ebc5925cffe77f4

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 78622 W: 13223 L: 13195 D: 52204 Elo +0.12
http://tests.stockfishchess.org/tests/view/5c8611cc0ebc5925cffe7f86

Further work could be to optimize the remaining see_ge() test. The idea of less pruning at higher depths is valuable, but perhaps the test (-PawnValueEg * depth) can be improved.

Bench: 3188688

Author: CoffeeOne
Date: Wed Mar 20 14:50:41 2019 +0100
Timestamp: 1553089841

Skip skipping thread scheme (#1972)


Several simplification tests (all with the bounds [-3,1]) were run:
5+0.05 8 threads, failed very quickly:
http://tests.stockfishchess.org/tests/view/5c439a020ebc5902bb5d3970

20+0.2 8 threads, also failed, but needed a lot more games:
http://tests.stockfishchess.org/tests/view/5c44b1b70ebc5902bb5d4e34

60+0.6 8 threads passed:
http://tests.stockfishchess.org/tests/view/5c48bfe40ebc5902bca15325

60+0.6 4 threads passed:
http://tests.stockfishchess.org/tests/view/5c4b71a00ebc593af5d49904

No functional change.

Author: Marco Costalba
Date: Tue Mar 12 08:35:10 2019 +0100
Timestamp: 1552376110

Increase thread stack for OS X (#2035)

On OS X threads other than the main thread are created with a reduced stack
size of 512KB by default, this is dangerously low for deep searches, so
adjust it to TH_STACK_SIZE. The implementation calls pthread_create() with
proper stack size parameter.

Verified for no regression at STC enabling the patch on all platforms where
pthread is supported.

LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 50873 W: 9768 L: 9700 D: 31405 Elo +0.46

No functional change.

Author: protonspring
Date: Sun Mar 10 10:53:39 2019 +0100
Timestamp: 1552211619

Remove popcount16() (#2038)

This is a non-functional simplification / code-style change.

This popcount16 method does nothing but initialize the PopCnt16 arrays.

This can be done in a single bitset line, which is less lines and more clear. Performance for this code is moot.

No functional change.

Author: xoto10
Date: Sun Mar 10 10:47:42 2019 +0100
Timestamp: 1552211262

Simplify failedLow away #1986

FailedLow doesn't seem to add any value so remove it.

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 43915 W: 9682 L: 9604 D: 24629 Elo +0.62
http://tests.stockfishchess.org/tests/view/5c5339770ebc592fc7baef74

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 58515 W: 9670 L: 9609 D: 39236 Elo +0.36
http://tests.stockfishchess.org/tests/view/5c53cc840ebc592fc7baf6c1

Ideas for further work:

Tune the values in the revised fallingEval calculation
Consider adding a term using delta, e.g. c * (delta - 20) as an indicator of eval instability

Bench: 3318033

Author: Marco Costalba
Date: Sat Mar 9 13:28:11 2019 +0100
Timestamp: 1552134491

Revert "Allowing singular extension in mate positions"

It was causing an assert: value > -VALUE_INFINITE
under some conditions.

See https://github.com/official-stockfish/Stockfish/issues/2036

Bench: 3318033

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Post  kramnik on Thu Apr 04, 2019 6:00 am

Stockfish Polyglot: Updated Avril, 4 2019.

This distribution is the expansion of Stockfish beta having timestamp: 1554025656 - Assorted trivial cleanups 3/2019 (#2030).

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Post  kramnik on Sun Apr 14, 2019 12:03 am

Stockfish Polyglot: Updated Avril, 13 2019.

This distribution is the expansion of Stockfish beta having timestamp: 1555069684 - Revert "Shuffle detection #2064".

The value max_threads = std::thread::hardware_concurrency(); has been added to ucioption.cpp so that the engine settings dialog box is set by default with the maximum number of threads.
This modification has been made by me being inspired by the Raubfisch default settings.

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Post  kramnik on Mon Apr 15, 2019 4:46 pm

Stockfish Polyglot: Updated Avril, 15 2019 and fixed.

This distribution is the expansion of Stockfish beta having timestamp: 1555069684 - Revert "Shuffle detection #2064".

- The bug on the UCI interface regarding the number of threads has been corrected (thanks to the user "engine ratings").
- The bug of the OwnBook checkbox not active has been corrected.


Changes since the last Stockfish Polyglot release:

Author: Joost VandeVondele
Date: Sat Apr 13 17:17:47 2019 +0200
Timestamp: 1555168667

Remove two useless assignments (#2093)

These variables are initialized before their use in the movepicker loop.

passed STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 138732 W: 30727 L: 30838 D: 77167 Elo -0.28
http://tests.stockfishchess.org/tests/view/5cb07af40ebc5925cf012c32

No functional change.

Author: Joost VandeVondele
Date: Sat Apr 13 17:15:15 2019 +0200
Timestamp: 1555168515

Give penalty for all early quiets of prev. ply

passed STC:
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 32884 W: 7283 L: 7184 D: 18417 Elo +1.05
http://tests.stockfishchess.org/tests/view/5cacb1b20ebc5925cf00ce97

passed LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 22869 W: 3920 L: 3803 D: 15146 Elo +1.78
http://tests.stockfishchess.org/tests/view/5cacbd760ebc5925cf00cfce

Bench: 3723099

Author: protonspring
Date: Sat Apr 13 16:58:41 2019 +0200
Timestamp: 1555167521

Simplify Connected Pawn Scoring #2090

This is a functional simplification that simplifies
connected scoring of pawns.

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 37472 W: 8318 L: 8228 D: 20926 Elo +0.83
http://tests.stockfishchess.org/tests/view/5cae74ef0ebc5925cf00f8a5

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 43035 W: 7366 L: 7281 D: 28388 Elo +0.69
http://tests.stockfishchess.org/tests/view/5caea3b50ebc5925cf00fe1e

Bench: 3470173  

Author: Massimiliano Goi
Date: Sat Apr 13 23:30:04 2019 +0200

The value max_threads = std::thread::hardware_concurrency(); has been added to ucioption.cpp so that the
engine settings dialog box is set by default with the maximum number of threads.

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Post  kramnik on Fri Apr 26, 2019 10:52 pm

Stockfish Polyglot: Updated Avril, 26 2019.

This distribution is the expansion of Stockfish beta having timestamp: 1556128317 - Remove useless initializations (#2115)".

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Post  Ginelu on Sun Apr 28, 2019 1:41 pm

kramnik wrote:Stockfish Polyglot: Updated Avril, 26 2019.

This distribution is the expansion of Stockfish beta having timestamp: 1556128317 - Remove useless initializations (#2115)".

Thank you very much! Even though Stockfish does not help me much in mailing, I continue to ask her for an analysis of about an hour. It's the best engine in the world and I can not ignore it completely. Even if he loses the matches with the engines using BOOK.bin, he manages to take many draws and even win.

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Post  kramnik on Sun Apr 28, 2019 10:57 pm

You are free to do as you wish, of course. But if I were you I would definitely use CorChess or Komodo 12.3 for correspondence chess... Besides if you have Fritz there is the Clouding Room where you can rent monstrous computer for analysis. I often rent the one with most cores (hawk) or ducu7: both of them have asmFish and they behave very well in analysis, while asmfish running on my computer have the same incoherence problems than Stockfish and Raubfisch.

There is not a specific rule in chess, the last word is up to you, I can only show you a path. Experiment and find your own best combination.

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Post  Ginelu on Mon Apr 29, 2019 1:51 am

kramnik wrote:You are free to do as you wish, of course. But if I were you I would definitely use CorChess or Komodo 12.3 for correspondence chess... Besides if you have Fritz there is the Clouding Room where you can rent monstrous computer for analysis. I often rent the one with most cores (hawk) or ducu7: both of them have asmFish and they behave very well in analysis, while asmfish running on my computer have the same incoherence problems than Stockfish and Raubfisch.

There is not a specific rule in chess, the last word is up to you, I can only show you a path. Experiment and find your own best combination.

You are perfectly right. In other words, each one stretches as his blanket is.
 I did a test of 89 games Stockfish 270419 - Stockfish Polyglot 260419 at 1m + 1s and I was surprised that Sockfish 270419 won 12-10, the remaining draws. I gave Stockfish Polyglot Book.bin Goi5.1. I expect to win Stockfish Polyglot ...

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Post  kramnik on Mon Apr 29, 2019 2:16 am

There is a significant elo raising in Stockfish270419:

Total: 17133 W: 3952 L: 3701 D: 9480 Elo +5.09
http://tests.stockfishchess.org/tests/view/5cc3550b0ebc5925cf02dada

passed LTC
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 37316 W: 6470 L: 6188 D: 24658 Elo +2.63

So I'm not surprised so much... Anyway I'm curious on what book did you use for Stockfish270419...

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Post  Ginelu on Mon Apr 29, 2019 12:18 pm

kramnik wrote:There is a significant elo raising in Stockfish270419:

Total: 17133 W: 3952 L: 3701 D: 9480 Elo +5.09
http://tests.stockfishchess.org/tests/view/5cc3550b0ebc5925cf02dada

passed LTC
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 37316 W: 6470 L: 6188 D: 24658 Elo +2.63

So I'm not surprised so much... Anyway I'm curious on what book did you use for Stockfish270419...

Since Stockfish 270419 does not have the Book.bin option, I think it will refer to Book.ctg. This was Goi5.1, downloaded free of charge from your site and for which I want to thank you very much.

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Post  kramnik on Tue Apr 30, 2019 8:00 am

So in other words you have just tested Goi 5.1 BIN vs Goi 5.1 CTG update 2... My books are not for engines testing as they are very long, unless you fix the book moves up to move #3 or something around that. If you plan to test engines you should use a very low number of book moves or a book very, very short.

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Post  Ginelu on Tue Apr 30, 2019 2:02 pm

kramnik wrote:So in other words you have just tested Goi 5.1 BIN vs Goi 5.1 CTG update 2... My books are not for engines testing as they are very long, unless you fix the book moves up to move #3 or something around that. If you plan to test engines you should use a very low number of book moves or a book very, very short.

I wanted to test at the same time Goi 5.1.ctg. At first I was somewhat disappointed, because I did not find variants longer than 14 moves. I insisted after you repeated that the variants are long. I found in the French Defense (V. Tarrasch) a variant of 77 mutants that ended with the mat. I was surprised to find that the variation went on in a totally unbalanced position: Queen, Rook and pawn vs Rook! In such an end, no computer is needed. The sequel is useful in a difficult ending, such as a Queen ending or a finale with the difficulty of a study. We found a variant until moving 59 and Immortal v17. Now it depends on who played those variations: a GM, a long-time match engine ...

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Post  kramnik on Thu May 02, 2019 4:14 am

Stockfish Polyglot: Updated May, 2 2019.

This distribution is the expansion of Stockfish beta having timestamp: 1556390826 - Allow for address sanitizer. (#2119).

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Post  Ginelu on Thu May 02, 2019 12:27 pm

kramnik wrote:Stockfish Polyglot: Updated May, 2 2019.

This distribution is the expansion of Stockfish beta having timestamp: 1556390826 - Allow for address sanitizer. (#2119).

Thank you very much!

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Post  kramnik on Wed May 15, 2019 1:46 pm

Stockfish Polyglot: Updated May, 15 2019.

This distribution is the expansion of Stockfish beta having timestamp: 1557912187 - Update failedHighCnt rule #2063..

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