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Update README.md

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• reorder some sections of the README file
• add reference to the AUTHORS file
• rename Syzygybases to Syzygy tablebases
• add pointer to the Discord channel
• more precise info about the GPLv3 licence

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Stéphane Nicolet 2021-02-16 16:19:37 +01:00
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@ -25,23 +25,14 @@ This distribution of Stockfish consists of the following files:
* Copying.txt, a text file containing the GNU General Public License version 3. * Copying.txt, a text file containing the GNU General Public License version 3.
* AUTHORS, a text file with the list of authors for the project
* src, a subdirectory containing the full source code, including a Makefile * src, a subdirectory containing the full source code, including a Makefile
that can be used to compile Stockfish on Unix-like systems. that can be used to compile Stockfish on Unix-like systems.
* a file with the .nnue extension, storing the neural network for the NNUE * a file with the .nnue extension, storing the neural network for the NNUE
evaluation. Binary distributions will have this file embedded. evaluation. Binary distributions will have this file embedded.
Note: to use the NNUE evaluation, the additional data file with neural network parameters
needs to be available. Normally, this file is already embedded in the binary or it can be downloaded.
The filename for the default (recommended) net can be found as the default
value of the `EvalFile` UCI option, with the format `nn-[SHA256 first 12 digits].nnue`
(for instance, `nn-c157e0a5755b.nnue`). This file can be downloaded from
```
https://tests.stockfishchess.org/api/nn/[filename]
```
replacing `[filename]` as needed.
## UCI options ## UCI options
Currently, Stockfish has the following UCI options: Currently, Stockfish has the following UCI options:
@ -53,6 +44,9 @@ Currently, Stockfish has the following UCI options:
* #### Hash * #### Hash
The size of the hash table in MB. It is recommended to set Hash after setting Threads. The size of the hash table in MB. It is recommended to set Hash after setting Threads.
* #### Clear Hash
Clear the hash table.
* #### Ponder * #### Ponder
Let Stockfish ponder its next move while the opponent is thinking. Let Stockfish ponder its next move while the opponent is thinking.
@ -109,7 +103,7 @@ Currently, Stockfish has the following UCI options:
* #### SyzygyProbeDepth * #### SyzygyProbeDepth
Minimum remaining search depth for which a position is probed. Set this option Minimum remaining search depth for which a position is probed. Set this option
to a higher value to probe less aggressively if you experience too much slowdown to a higher value to probe less aggressively if you experience too much slowdown
(in terms of nps) due to TB probing. (in terms of nps) due to tablebase probing.
* #### Syzygy50MoveRule * #### Syzygy50MoveRule
Disable to let fifty-move rule draws detected by Syzygy tablebase probes count Disable to let fifty-move rule draws detected by Syzygy tablebase probes count
@ -139,13 +133,10 @@ Currently, Stockfish has the following UCI options:
Tells the engine to use nodes searched instead of wall time to account for Tells the engine to use nodes searched instead of wall time to account for
elapsed time. Useful for engine testing. elapsed time. Useful for engine testing.
* #### Clear Hash
Clear the hash table.
* #### Debug Log File * #### Debug Log File
Write all communication to and from the engine into a text file. Write all communication to and from the engine into a text file.
## A note on classical and NNUE evaluation ## A note on classical evaluation versus NNUE evaluation
Both approaches assign a value to a position that is used in alpha-beta (PVS) search Both approaches assign a value to a position that is used in alpha-beta (PVS) search
to find the best move. The classical evaluation computes this value as a function to find the best move. The classical evaluation computes this value as a function
@ -158,18 +149,29 @@ The NNUE evaluation was first introduced in shogi, and ported to Stockfish after
It can be evaluated efficiently on CPUs, and exploits the fact that only parts It can be evaluated efficiently on CPUs, and exploits the fact that only parts
of the neural network need to be updated after a typical chess move. of the neural network need to be updated after a typical chess move.
[The nodchip repository](https://github.com/nodchip/Stockfish) provides additional [The nodchip repository](https://github.com/nodchip/Stockfish) provides additional
tools to train and develop the NNUE networks. tools to train and develop the NNUE networks. On CPUs supporting modern vector instructions
(avx2 and similar), the NNUE evaluation results in much stronger playing strength, even
if the nodes per second computed by the engine is somewhat lower (roughly 80% of nps
is typical).
On CPUs supporting modern vector instructions (avx2 and similar), the NNUE evaluation Notes:
results in stronger playing strength, even if the nodes per second computed by the engine
is somewhat lower (roughly 60% of nps is typical).
Note that the NNUE evaluation depends on the Stockfish binary and the network parameter 1) the NNUE evaluation depends on the Stockfish binary and the network parameter
file (see EvalFile). Not every parameter file is compatible with a given Stockfish binary. file (see the EvalFile UCI option). Not every parameter file is compatible with a given
The default value of the EvalFile UCI option is the name of a network that is guaranteed Stockfish binary, but the default value of the EvalFile UCI option is the name of a network
to be compatible with that binary. that is guaranteed to be compatible with that binary.
## What to expect from Syzygybases? 2) to use the NNUE evaluation, the additional data file with neural network parameters
needs to be available. Normally, this file is already embedded in the binary or it
can be downloaded. The filename for the default (recommended) net can be found as the default
value of the `EvalFile` UCI option, with the format `nn-[SHA256 first 12 digits].nnue`
(for instance, `nn-c157e0a5755b.nnue`). This file can be downloaded from
```
https://tests.stockfishchess.org/api/nn/[filename]
```
replacing `[filename]` as needed.
## What to expect from the Syzygy tablebases?
If the engine is searching a position that is not in the tablebases (e.g. If the engine is searching a position that is not in the tablebases (e.g.
a position with 8 pieces), it will access the tablebases during the search. a position with 8 pieces), it will access the tablebases during the search.
@ -187,9 +189,9 @@ will not report a mate score, even if the position is known to be won.**
It is therefore clear that this behaviour is not identical to what one might It is therefore clear that this behaviour is not identical to what one might
be used to with Nalimov tablebases. There are technical reasons for this be used to with Nalimov tablebases. There are technical reasons for this
difference, the main technical reason being that Nalimov tablebases use the difference, the main technical reason being that Nalimov tablebases use the
DTM metric (distance-to-mate), while Syzygybases use a variation of the DTM metric (distance-to-mate), while the Syzygy tablebases use a variation of the
DTZ metric (distance-to-zero, zero meaning any move that resets the 50-move DTZ metric (distance-to-zero, zero meaning any move that resets the 50-move
counter). This special metric is one of the reasons that Syzygybases are counter). This special metric is one of the reasons that the Syzygy tablebases are
more compact than Nalimov tablebases, while still storing all information more compact than Nalimov tablebases, while still storing all information
needed for optimal play and in addition being able to take into account needed for optimal play and in addition being able to take into account
the 50-move rule. the 50-move rule.
@ -272,8 +274,9 @@ generic rather than being focused on Stockfish's precise implementation.
Nevertheless, a helpful resource. Nevertheless, a helpful resource.
* The latest source can always be found on [GitHub](https://github.com/official-stockfish/Stockfish). * The latest source can always be found on [GitHub](https://github.com/official-stockfish/Stockfish).
Discussions about Stockfish take place in the [FishCooking](https://groups.google.com/forum/#!forum/fishcooking) Discussions about Stockfish take place these days mainly in the [FishCooking](https://groups.google.com/forum/#!forum/fishcooking)
group and engine testing is done on [Fishtest](https://tests.stockfishchess.org/tests). group and on the [Stockfish Discord channel](https://discord.gg/nv8gDtt).
The engine testing is done on [Fishtest](https://tests.stockfishchess.org/tests).
If you want to help improve Stockfish, please read this [guideline](https://github.com/glinscott/fishtest/wiki/Creating-my-first-test) If you want to help improve Stockfish, please read this [guideline](https://github.com/glinscott/fishtest/wiki/Creating-my-first-test)
first, where the basics of Stockfish development are explained. first, where the basics of Stockfish development are explained.
@ -288,9 +291,10 @@ it (either by itself or as part of some bigger software package), or
using it as the starting point for a software project of your own. using it as the starting point for a software project of your own.
The only real limitation is that whenever you distribute Stockfish in The only real limitation is that whenever you distribute Stockfish in
some way, you must always include the full source code, or a pointer some way, you MUST always include the full source code, or a pointer
to where the source code can be found. If you make any changes to the to where the source code can be found, to generate the exact binary
source code, these changes must also be made available under the GPL. you are distributing. If you make any changes to the source code,
these changes must also be made available under the GPL.
For full details, read the copy of the GPL v3 found in the file named For full details, read the copy of the GPL v3 found in the file named
*Copying.txt*. *Copying.txt*.