"readme" for "40H-PGN" Databases. Copyright (c) 2014-24 by Norman Pollock. All Rights Reserved. These PGN database files are freeware. They consist of games between human players ("gm" databases) or computer engines ("cc" databases) that are available in the Public Domain on the Internet. They were edited by Norman Pollock. No warranty, expressed or implied, is made that the information provided in the databases or the readme-pgn-db.txt is accurate. This includes names of players, game moves and game results. No warranty, expressed or implied, is made as to the worthiness of these files for chess usage. The user bears full responsibility for any consequences from the use or misuse of these files. The editor is not responsible for any damages or losses of any kind. These database files can be freely distributed provided they are distributed "as is". The editor is not responsible for any changes made by others. "40H Chess Tools, Utilities and Databases" has 2 download sites: 40hchess.epizy.com nk-qy.info/40h (Thanks to Frank Quisinsky) Please bookmark. contact: rc1242(at)yahoo(dot)com ========================== "40H-PGN" "gm" databases ========================== The "40H-PGN" "gm" databases are high quality databases containing mostly long time-control (LTC), over-the-board (OTB) games between high-level human players. Game inclusion is selective and is based on filters described below. The files are: gm1831.pgn, gm1931.pgn, gm1981.pgn. and gm2016.pgn. Each file covers a specified time period: gm1831.pgn : 1831-1930; gm1931.pgn : 1931-1980; gm1981.pgn : 1981-2015; gm2016.pgn : 2016-. As of 01 January 2016, games in the "FIDE World Rapid Championship", both Men and Women, are included. Games were removed if any of the following terms, or similar terms, occurred in the "Event" or "Site" tags: Rapid (except FIDE World Rapid Championship 2016-present) Blitz Speed Bullet Armageddon Blindfold Consultation Correspondence Simultaneous Exhibition Friendly Casual Internet (almost all are rapid or shorter games) Chess960 A specific required opening (eg Vienna Gambit, Sicilian) Whenever the "Event" or "Site" tag indicates a short time-control, the games are removed. But since many such games do not give an indication of their short time-control, it is likely that many of those games are present in this database. Only games with ply counts between 41 and 500 inclusive are included. Duplicate games (same moves as an existing game) and many twin games (near-duplicate games) were removed. Comments and variations were removed. Games were checked for technical errors using "joined" by Andreas Stable and "PGN-Extract" by David Barnes. Such games were fixed or removed. Games were scanned by "Game Analyser" by Thomas McBurney for early blunders (a change of 750+ centipawns) in the first 20 moves. Such games were removed. Games with a FEN tag were removed, including Chess960 games. "ECO" codes were recalculated using extended "SCID" ECO codes. Games were sorted by the following keys: ECO, White, Black, Result, and Date. Games have full-move formatting on each line. --------------- Each file has its own additional filtering: (1) gm1831.pgn Games were played from 1831 to 1930. Number of games = 21,567 Number of players = 546 Number of clusters = 1 Minimum # games each player = 10 Minimum player score percent = 20.0% Minimum plies each game = 41 Maximum plies each game = 500 Date Range = 1831.01.01 : 1930.12.31 Version = 2024.04.08 --------------- (2) gm1931.pgn Games were played from 1931 to 1980. Number of games = 173,884 Number of players = 3,198 Number of clusters = 1 Minimum # games each player = 12 Minimum player score percent = 20.0% Minimum plies each game = 41 Maximum plies each game = 500 Date Range = 1931.01.01 : 1980.12.31 Version = 2024.04.07 --------------- (3) gm1981.pgn Games were played from 1981 to 2015. Number of games = 414,441 Number of players = 3,541 Number of clusters = 1 Minimum Elo Rating each player = 2400 Minimum # games each player = 16 Minimum player score percent = 20.0% Minimum plies each game = 41 Maximum plies each game = 500 Date Range = 1981.01.01 : 2015.12.31 Version = 2024.04.08 --------------- (4) gm2016.pgn Games were played from 2016 to 2024. Number of games = 135,542 Number of players = 2,020 Number of clusters = 1 Minimum Elo Rating each player = 2400 Minimum # games each player = 20 Minimum player score percent = 20.0% Minimum plies each game = 41 Maximum plies each game = 500 Date Range = 2016.01.01 : 2024.04.08 Version = 2024.04.08 ============================== "40H-PGN" "cc" databases ============================== cc-tcec.pgn "cc-tcec.pgn" is an edited collection of selected games from the TCEC chess competitions ( https://tcec-chess.com ). The games are presented in a readable format arranged by openings. TCEC is regarded by many chess enthusiasts as the "unofficial" world championship competition between chess engines. All games are played on high-end computers with long time-controls. These selected games are from the TCEC "Season" competitions starting with "Season 11" (2018). They were played in the "Division P" section up through the "Superfinal" section, including any intermediate sections. In TCEC competitions, openings are selected by chess experts. The openings are intentionally selected to be biased in favor of White in order to reduce the number of draws. Competitors play each opening from both sides of the board in consecutive games to balance out the intentional bias. As a result of the intentional opening bias, the ratio of White wins to Black wins is very high. For further information on the intentional biased openings: https://wiki.chessdom.org/Openings_FAQ The full unedited "pgn" of every game is available in the "Archive" section of "https://tcec-chess.com". Here you will find all TCEC games. A huge "Thank You" to the TCEC organization, and its sponsor "Chessdom Arena", for organizing these competitions and for putting their games into the Public Domain. ---------- EDITING LOG: Removed version data from the chess engine names. Users should be aware that chess engines were updated for each new season. Removed comments and variations. Removed some Tags. Rearranged the order of the Tags. Replaced ECO codes with "Scid vs PC" extended ECO codes. Sorted the games by ECO codes. Re-formatted the "Move" section of each game (full moves are on the same line). Removed games with non-standard terminations. Checked games for technical problems and any problem was either fixed or the game was removed. Links in old "Site" tags were updated. "https://tcec-chess.com" was replaced by "http://tcec.chessdom.com". ---------- Number of games = 5,024 Number of players = 22 Number of clusters = 1 Minimum plies each game = 41 Maximum plies each game = 500 Date Range = 2018.02.13 : 2023.10.29 Seasons = 11 : 25 Version = 2023.10.29 ============================== ==============================