"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: gm1831-1930.pgn, gm1931-1980.pgn, and gm1981-2024.pgn. Each file covers the specified time period shown in their filename. To shorten the time period, use "minDate.exe" from "40H-PGN" tools. For example: mindate gm1931-1980.pgn 1961.01.01 1969.12.31 will extract games from the specified time period to "outA.pgn". 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 games are short time-control) Chess960 Showdown Whenever the "Event" or "Site" tag indicates a short time-control, the games are removed. But since many such games do not state their short time-control, many games of short time-control (in addition to World Rapid games) are present in the database files. 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) gm1831-1930.pgn Games were played from 1831 to 1930. Number of games = 21,552 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 = 2024.08.06 --------------- (2) gm1931-1980.pgn Games were played from 1931 to 1980. Number of games = 173,809 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 = 2024.08.06 --------------- (3) gm1981-2024.pgn Games were played from 1981 to 2024. Number of games = 562,119 Number of players = 4,149 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 = 1981.01.01 : 2024.08.26 Version = 2024.08.26 ============================== "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) to "Season 26" (2024). The selected games are from the "Division P" tournament up through the "Superfinal" tournament, including any intervening tournament(s). In TCEC competitions, the openings are selected by chess opening experts, NOT BY THE ENGINES OR BY OPENING BOOKS. The reason for using BIASED OPENINGS is to increase the number of decisive results ("1-0" or "0-1"). To balance out the biased openings, the chess engines play each opening from both sides of the board, in consecutive games. The biased openings are chosen to be at approximately the same level of bias for all the games of a particular tournament. For further information on the intentional biased openings: https://tcec-chess.com/articles/TCEC_Openings_FAQ.html 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: "http://tcec.chessdom.com" was replaced by "https://tcec-chess.com". ---------- Number of games = 5,347 Number of players = 23 Number of clusters = 1 Minimum plies each game = 41 Maximum plies each game = 500 Date Range = 2018.02.13 : 2024.06.01 Seasons = 11 : 26 Version = 2024.06.04 ============================== ==============================