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This patch ports the efficiently updatable neural network (NNUE) evaluation to Stockfish. Both the NNUE and the classical evaluations are available, and can be used to assign a value to a position that is later used in alpha-beta (PVS) search to find the best move. The classical evaluation computes this value as a function of various chess concepts, handcrafted by experts, tested and tuned using fishtest. The NNUE evaluation computes this value with a neural network based on basic inputs. The network is optimized and trained on the evalutions of millions of positions at moderate search depth. The NNUE evaluation was first introduced in shogi, and ported to Stockfish afterward. 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. [The nodchip repository](https://github.com/nodchip/Stockfish) provides additional tools to train and develop the NNUE networks. This patch is the result of contributions of various authors, from various communities, including: nodchip, ynasu87, yaneurao (initial port and NNUE authors), domschl, FireFather, rqs, xXH4CKST3RXx, tttak, zz4032, joergoster, mstembera, nguyenpham, erbsenzaehler, dorzechowski, and vondele. This new evaluation needed various changes to fishtest and the corresponding infrastructure, for which tomtor, ppigazzini, noobpwnftw, daylen, and vondele are gratefully acknowledged. The first networks have been provided by gekkehenker and sergiovieri, with the latter net (nn-97f742aaefcd.nnue) being the current default. The evaluation function can be selected at run time with the `Use NNUE` (true/false) UCI option, provided the `EvalFile` option points the the network file (depending on the GUI, with full path). The performance of the NNUE evaluation relative to the classical evaluation depends somewhat on the hardware, and is expected to improve quickly, but is currently on > 80 Elo on fishtest: 60000 @ 10+0.1 th 1 https://tests.stockfishchess.org/tests/view/5f28fe6ea5abc164f05e4c4c ELO: 92.77 +-2.1 (95%) LOS: 100.0% Total: 60000 W: 24193 L: 8543 D: 27264 Ptnml(0-2): 609, 3850, 9708, 10948, 4885 40000 @ 20+0.2 th 8 https://tests.stockfishchess.org/tests/view/5f290229a5abc164f05e4c58 ELO: 89.47 +-2.0 (95%) LOS: 100.0% Total: 40000 W: 12756 L: 2677 D: 24567 Ptnml(0-2): 74, 1583, 8550, 7776, 2017 At the same time, the impact on the classical evaluation remains minimal, causing no significant regression: sprt @ 10+0.1 th 1 https://tests.stockfishchess.org/tests/view/5f2906a2a5abc164f05e4c5b LLR: 2.94 (-2.94,2.94) {-6.00,-4.00} Total: 34936 W: 6502 L: 6825 D: 21609 Ptnml(0-2): 571, 4082, 8434, 3861, 520 sprt @ 60+0.6 th 1 https://tests.stockfishchess.org/tests/view/5f2906cfa5abc164f05e4c5d LLR: 2.93 (-2.94,2.94) {-6.00,-4.00} Total: 10088 W: 1232 L: 1265 D: 7591 Ptnml(0-2): 49, 914, 3170, 843, 68 The needed networks can be found at https://tests.stockfishchess.org/nns It is recommended to use the default one as indicated by the `EvalFile` UCI option. Guidelines for testing new nets can be found at https://github.com/glinscott/fishtest/wiki/Creating-my-first-test#nnue-net-tests Integration has been discussed in various issues: https://github.com/official-stockfish/Stockfish/issues/2823 https://github.com/official-stockfish/Stockfish/issues/2728 The integration branch will be closed after the merge: https://github.com/official-stockfish/Stockfish/pull/2825 https://github.com/official-stockfish/Stockfish/tree/nnue-player-wip closes https://github.com/official-stockfish/Stockfish/pull/2912 This will be an exciting time for computer chess, looking forward to seeing the evolution of this approach. Bench: 4746616
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# List of authors for Stockfish, as of August 4, 2020
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# Founders of the Stockfish project and fishtest infrastructure
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Tord Romstad (romstad)
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Marco Costalba (mcostalba)
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Joona Kiiski (zamar)
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Gary Linscott (glinscott)
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# Authors and inventors of NNUE, training, NNUE port
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Yu Nasu (ynasu87)
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Motohiro Isozaki (yaneurao)
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Hisayori Noda (nodchip)
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# all other authors of the code in alphabetical order
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Aditya (absimaldata)
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Adrian Petrescu (apetresc)
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Ajith Chandy Jose (ajithcj)
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Alain Savard (Rocky640)
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Alayan Feh (Alayan-stk-2)
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Alexander Kure
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Alexander Pagel (Lolligerhans)
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Ali AlZhrani (Cooffe)
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Andrew Grant (AndyGrant)
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Andrey Neporada (nepal)
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Andy Duplain
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Aram Tumanian (atumanian)
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Arjun Temurnikar
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Auguste Pop
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Balint Pfliegel
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Ben Koshy (BKSpurgeon)
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Bill Henry (VoyagerOne)
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Bojun Guo (noobpwnftw, Nooby)
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braich
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Brian Sheppard (SapphireBrand, briansheppard-toast)
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Bryan Cross (crossbr)
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candirufish
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Chess13234
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Chris Cain (ceebo)
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Dan Schmidt (dfannius)
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Daniel Axtens (daxtens)
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Daniel Dugovic (ddugovic)
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Dariusz Orzechowski
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David Zar
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Daylen Yang (daylen)
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DiscanX
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Dominik Schlösser (domschl)
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double-beep
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Eduardo Cáceres (eduherminio)
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Eelco de Groot (KingDefender)
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Elvin Liu (solarlight2)
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erbsenzaehler
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Ernesto Gatti
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Linmiao Xu (linrock)
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Fabian Beuke (madnight)
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Fabian Fichter (ianfab)
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fanon
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Fauzi Akram Dabat (FauziAkram)
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Felix Wittmann
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gamander
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Gary Heckman (gheckman)
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gguliash
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Gian-Carlo Pascutto (gcp)
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Gontran Lemaire (gonlem)
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Goodkov Vasiliy Aleksandrovich (goodkov)
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Gregor Cramer
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GuardianRM
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Günther Demetz (pb00067, pb00068)
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Guy Vreuls (gvreuls)
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Henri Wiechers
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Hiraoka Takuya (HiraokaTakuya)
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homoSapiensSapiens
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Hongzhi Cheng
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Ivan Ivec (IIvec)
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Jacques B. (Timshel)
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Jan Ondruš (hxim)
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Jared Kish (Kurtbusch)
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Jarrod Torriero (DU-jdto)
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Jean Gauthier (OuaisBla)
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Jean-Francois Romang (jromang)
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Jekaa
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Jerry Donald Watson (jerrydonaldwatson)
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Jonathan Calovski (Mysseno)
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Jonathan Dumale (SFisGOD)
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Joost VandeVondele (vondele)
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Jörg Oster (joergoster)
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Joseph Ellis (jhellis3)
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Joseph R. Prostko
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jundery
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Justin Blanchard (UncombedCoconut)
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Kelly Wilson
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Ken Takusagawa
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kinderchocolate
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Kiran Panditrao (Krgp)
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Kojirion
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Leonardo Ljubičić (ICCF World Champion)
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Leonid Pechenik (lp--)
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Linus Arver (listx)
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loco-loco
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Lub van den Berg (ElbertoOne)
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Luca Brivio (lucabrivio)
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Lucas Braesch (lucasart)
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Lyudmil Antonov (lantonov)
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Maciej Żenczykowski (zenczykowski)
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Malcolm Campbell (xoto10)
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Mark Tenzer (31m059)
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marotear
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Matthew Lai (matthewlai)
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Matthew Sullivan (Matt14916)
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Michael An (man)
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Michael Byrne (MichaelB7)
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Michael Chaly (Vizvezdenec)
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Michael Stembera (mstembera)
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Michael Whiteley (protonspring)
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Michel Van den Bergh (vdbergh)
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Miguel Lahoz (miguel-l)
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Mikael Bäckman (mbootsector)
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Mira
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Miroslav Fontán (Hexik)
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Moez Jellouli (MJZ1977)
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Mohammed Li (tthsqe12)
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Nathan Rugg (nmrugg)
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Nick Pelling (nickpelling)
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Nicklas Persson (NicklasPersson)
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Niklas Fiekas (niklasf)
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Nikolay Kostov (NikolayIT)
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Nguyen Pham (nguyenpham)
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Norman Schmidt (FireFather)
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Ondrej Mosnáček (WOnder93)
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Oskar Werkelin Ahlin
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Pablo Vazquez
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Panthee
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Pascal Romaret
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Pasquale Pigazzini (ppigazzini)
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Patrick Jansen (mibere)
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pellanda
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Peter Zsifkovits (CoffeeOne)
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Praveen Kumar Tummala (praveentml)
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Rahul Dsilva (silversolver1)
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Ralph Stößer (Ralph Stoesser)
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Raminder Singh
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renouve
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Reuven Peleg
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Richard Lloyd
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Rodrigo Exterckötter Tjäder
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Ron Britvich (Britvich)
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Ronald de Man (syzygy1, syzygy)
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rqs
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Ryan Schmitt
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Ryan Takker
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Sami Kiminki (skiminki)
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Sebastian Buchwald (UniQP)
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Sergei Antonov (saproj)
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Sergei Ivanov (svivanov72)
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sf-x
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Shane Booth (shane31)
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Shawn Varghese (xXH4CKST3RXx)
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Stefan Geschwentner (locutus2)
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Stefano Cardanobile (Stefano80)
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Steinar Gunderson (sesse)
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Stéphane Nicolet (snicolet)
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Thanar2
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thaspel
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theo77186
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Tom Truscott
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Tom Vijlbrief (tomtor)
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Tomasz Sobczyk (Sopel97)
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Torsten Franz (torfranz, tfranzer)
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Tracey Emery (basepr1me)
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tttak
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Unai Corzo (unaiic)
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Uri Blass (uriblass)
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Vince Negri (cuddlestmonkey)
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zz4032
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# Additionally, we acknowledge the authors and maintainers of fishtest,
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# an amazing and essential framework for the development of Stockfish!
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#
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# https://github.com/glinscott/fishtest/blob/master/AUTHORS
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