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This commit introduces Full Threat Input features, which are a subset of Piece(Square)-Piece(Square) pairs. In any given position, the active features consist of pairs where the second piece’s square lies in the attack set of the first piece. This is an extremely simplified explanation that leaves out many details. The already-used HalfKAv2_hm feature set completes the input features. Minor quantization changes have also been made. The net nn-49c1193b131c.nnue was trained by vondele using the following setup: https://github.com/vondele/nettest/blob/7de71238e9b295e3f88ed7c9c5936af632c9b981/threats.yaml A graphical version of an earlier scheme (with less refinement) that illustrates the core concepts can be found attached. [NewInputs.pdf](https://github.com/user-attachments/files/23478441/NewInputs.pdf) Further information, as well as a brief description of the history of development, can be found attached. [Stockfish threat inputs PR summary.pdf](https://github.com/user-attachments/files/23478634/Stockfish.threat.inputs.PR.summary.pdf) This has been a huge effort spanning over half a year, with the original [discussion thread](https://discord.com/channels/435943710472011776/1336647760388034610) reaching over 11k messages. Thanks to everyone who has contributed. Monty PRs: https://github.com/official-monty/Monty/pull/87 (Initial threat input PR) https://github.com/official-monty/Monty/pull/114 (Fixed threat indexing to take into account colour correctly) https://github.com/official-monty/Monty/pull/116 (i8 quantisation of weights whilst keeping calculations in i16) Yukari commit: https://github.com/yukarichess/yukari/commit/2d482c64a79cec03cf4987d5289334b9cdc737bc (Threat inputs merged) Plentychess PRs: https://github.com/Yoshie2000/PlentyChess/pull/400 (Threat inputs merged) https://github.com/Yoshie2000/PlentyChess/pull/411 (Threat input weights quantised to i8) Passed STC: LLR: 2.93 (-2.94,2.94) <0.00,2.00> Total: 63424 W: 16956 L: 16591 D: 29877 Ptnml(0-2): 276, 7522, 15797, 7795, 322 https://tests.stockfishchess.org/tests/view/69105b3dec1d00d2c195c569 Passed LTC: LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 27876 W: 7417 L: 7110 D: 13349 Ptnml(0-2): 23, 3033, 7530, 3318, 34 https://tests.stockfishchess.org/tests/view/6910d817ec1d00d2c195c66e Passed VVLTC (Hash accidentally set to 1/2 normal value for both sides): LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 12458 W: 3353 L: 3102 D: 6003 Ptnml(0-2): 0, 1106, 3767, 1355, 1 https://tests.stockfishchess.org/tests/view/69115a26ec1d00d2c195c7cd This version has also passed non-regression LTC against the originally passed version: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 51144 W: 13086 L: 12903 D: 25155 Ptnml(0-2): 22, 5167, 15018, 5336, 29 https://tests.stockfishchess.org/tests/view/69138a317ca87818523314bf LTC elo estimate on ARM: 1 patch : 13.9 1.9 38296.5 73728 52 2 master : 0.0 ---- 35431.5 73728 48 closes https://github.com/official-stockfish/Stockfish/pull/6411 bench: 2626086 Co-authored-by: Shawn Xu <xu107288696@gmail.com> Co-authored-by: Timothy Herchen <timothy.herchen@gmail.com> Co-authored-by: Viren6 <94880762+Viren6@users.noreply.github.com> Co-authored-by: Yoshie2000 <patrick.leonhardt@gmx.net> Co-authored-by: Joost Vandevondele <Joost.VandeVondele@gmail.com> Co-authored-by: rn5f107s2 <clemens.lerchl@gmail.com> Co-authored-by: cj5716 <125858804+cj5716@users.noreply.github.com> Co-authored-by: AliceRoselia <63040919+AliceRoselia@users.noreply.github.com> Co-authored-by: Linmiao Xu <linmiao.xu@gmail.com> Co-authored-by: Disservin <disservin.social@gmail.com>
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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, and 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 Stockfish code (in alphabetical order)
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87flowers
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Aditya (absimaldata)
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Adrian Petrescu (apetresc)
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Ahmed Kerimov (wcdbmv)
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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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Alfredo Menezes (lonfom169)
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Ali AlZhrani (Cooffe)
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AliceRoselia
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Andreas Jan van der Meulen (Andyson007)
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Andreas Matthies (Matthies)
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Andrei Vetrov (proukornew)
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Andrew Grant (AndyGrant)
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Andrey Neporada (nepal)
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Andy Duplain
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Antoine Champion (antoinechampion)
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Aram Tumanian (atumanian)
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Arjun Temurnikar
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Aron Petkovski (fury)
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Arseniy Surkov (codedeliveryservice)
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Artem Solopiy (EntityFX)
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Auguste Pop
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Balazs Szilagyi
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Balint Pfliegel
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Baptiste Rech (breatn)
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Ben Chaney (Chaneybenjamini)
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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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borg323
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Boštjan Mejak (PedanticHacker)
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braich
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Brian Sheppard (SapphireBrand, briansheppard-toast)
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Bruno de Melo Costa (BM123499)
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Bruno Pellanda (pellanda)
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Bryan Cross (crossbr)
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candirufish
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Carlos Esparza Sánchez (ces42)
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Chess13234
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Chris Bao (sscg13)
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Chris Cain (ceebo)
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Ciekce
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clefrks
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Clemens L. (rn5f107s2)
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Cody Ho (aesrentai)
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CSTENTOR
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Dale Weiler (graphitemaster)
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Daniel Axtens (daxtens)
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Daniel Dugovic (ddugovic)
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Daniel Monroe (daniel-monroe)
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Daniel Samek (DanSamek)
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Dan Schmidt (dfannius)
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Dariusz Orzechowski (dorzechowski)
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David (dav1312)
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David Zar
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Daylen Yang (daylen)
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Deshawn Mohan-Smith (GoldenRare)
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Dieter Dobbelaere (ddobbelaere)
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DiscanX
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Dominik Schlösser (domschl)
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double-beep
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Douglas Matos Gomes (dsmsgms)
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Dubslow
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Eduardo Cáceres (eduherminio)
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Eelco de Groot (KingDefender)
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Ehsan Rashid (erashid)
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Elvin Liu (solarlight2)
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erbsenzaehler
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Ernesto Gatti
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evqsx
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Fabian Beuke (madnight)
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Fabian Fichter (ianfab)
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Fanael Linithien (Fanael)
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fanon
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Fauzi Akram Dabat (fauzi2)
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Felix Wittmann
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gamander
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Gabriele Lombardo (gabe)
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Gahtan Nahdi
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Gary Heckman (gheckman)
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George Sobala (gsobala)
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gguliash
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Giacomo Lorenzetti (G-Lorenz)
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Gian-Carlo Pascutto (gcp)
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Goh CJ (cj5716)
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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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Guy Vreuls (gvreuls)
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Günther Demetz (pb00067, pb00068)
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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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Jake Senne (w1wwwwww)
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Jan Ondruš (hxim)
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Jared Kish (Kurtbusch, kurt22i)
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Jarrod Torriero (DU-jdto)
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Jasper Shovelton (Beanie496)
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Jean-Francois Romang (jromang)
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Jean Gauthier (OuaisBla)
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Jekaa
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Jerry Donald Watson (jerrydonaldwatson)
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jjoshua2
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Jonathan Buladas Dumale (SFisGOD)
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Jonathan Calovski (Mysseno)
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Jonathan McDermid (jonathanmcdermid)
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Joost VandeVondele (vondele)
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Joseph Ellis (jhellis3)
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Joseph R. Prostko
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Jost Triller (tsoj)
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Jörg Oster (joergoster)
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Julian Willemer (NightlyKing)
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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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Kenneth Lee (kennethlee33)
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kevlu8
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Kian E (KJE-98)
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Kieren Pearson (KierenP)
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kinderchocolate
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Kiran Panditrao (Krgp)
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Kirill Zaripov (kokodio)
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Kojirion
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Krisztián Peőcz
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Krystian Kuzniarek (kuzkry)
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Leonardo Ljubičić (ICCF World Champion)
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Leonid Pechenik (lp--)
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Li Ying (yl25946)
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Liam Keegan (lkeegan)
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Linmiao Xu (linrock)
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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 Marosi (Mapika)
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Mark Tenzer (31m059)
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marotear
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Mathias Parnaudeau (mparnaudeau)
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Matt Ginsberg (mattginsberg)
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Matthew Lai (matthewlai)
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Matthew Sullivan (Matt14916)
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Max A. (Disservin)
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Maxim Masiutin (maximmasiutin)
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Maxim Molchanov (Maxim)
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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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Mike Babigian (Farseer)
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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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Muzhen J (XInTheDark)
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Nathan Rugg (nmrugg)
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Nguyen Pham (nguyenpham)
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Nicklas Persson (NicklasPersson)
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Nick Pelling (nickpelling)
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Nicolas Duhamel (nikloskoda)
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Niklas Fiekas (niklasf)
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Nikolay Kostov (NikolayIT)
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Norman Schmidt (FireFather)
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notruck
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Nour Berakdar (Nonlinear)
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Ofek Shochat (OfekShochat, ghostway)
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Ondrej Mosnáček (WOnder93)
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Ondřej Mišina (AndrovT)
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Oskar Werkelin Ahlin
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Ömer Faruk Tutkun (OmerFarukTutkun)
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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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Patrick Leonhardt (Yoshie2000)
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Peter Schneider (pschneider1968)
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Peter Zsifkovits (CoffeeOne)
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PikaCat
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Praveen Kumar Tummala (praveentml)
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Prokop Randáček (ProkopRandacek)
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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 (R-Peleg)
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Richard Lloyd (Richard-Lloyd)
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Robert Nürnberg (robertnurnberg)
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Rodrigo Exterckötter Tjäder
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Rodrigo Roim (roim)
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Ronald de Man (syzygy1, syzygy)
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Ron Britvich (Britvich)
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rqs
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Rui Coelho (ruicoelhopedro)
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rustam-cpp
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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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Sergio Vieri (sergiovieri)
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sf-x
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Shahin M. Shahin (peregrine)
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Shane Booth (shane31)
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Shawn Varghese (xXH4CKST3RXx)
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Shawn Xu (xu-shawn)
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Siad Daboul (Topologist)
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Stefan Geschwentner (locutus2)
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Stefano Cardanobile (Stefano80)
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Stefano Di Martino (StefanoD)
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Steinar Gunderson (sesse)
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Stéphane Nicolet (snicolet)
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Stephen Touset (stouset)
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Stockfisher69
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Styx (styxdoto)
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Syine Mineta (MinetaS)
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Taras Vuk (TarasVuk)
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Thanar2
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thaspel
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theo77186
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TierynnB
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Timothy Herchen (anematode)
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Ting-Hsuan Huang (fffelix-huang)
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Tobias Steinmann
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Tomasz Sobczyk (Sopel97)
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Tom Truscott
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Tom Vijlbrief (tomtor)
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Torsten Franz (torfranz, tfranzer)
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Torsten Hellwig (Torom)
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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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Viren
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Wencey Wang
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windfishballad
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xefoci7612
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Xiang Wang (KatyushaScarlet)
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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 Stockfish development!
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#
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# https://github.com/official-stockfish/fishtest/blob/master/AUTHORS
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