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Hi, first time poster.  This is about getting an opening name from a transposed position  I've been working on a Chess React app for a while which provides stats, including win rates for openings.  I've created a JSON file of about 60000 lines which has lots of chess openings.  My code reads the games PGN, matches the first part of it to my JSON and returns that opening.  I've created seperate "game" logic in another project that converts the PGN to a FEN position. (I don't want to use this seperate code in my react app as it's quite large on its own.) The issue is, my code will only recognise the opening if the PGN matches, meaning that the moves must be in a correct order It will recognise this as the Italian Game, Blackburne Shilling Gambit: 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nd4 But it will recognise this as a Bishops opening: 1.e4 e5 2.Bc4 Nc6 3.Nf3 Nd4 Despite the FEN being the same  I'm looking for ways to get them both to say the correct opening, as well as all other openings. An idea would be to get every possible FEN and put the opening name to that, but considering the number of board positions that exist, that doesn't seem possible.  If this is more vague, I can definitely elaborate Uhh... How do you post images? 😅 I can't really explain this without a visual aid haha 

I now that you are busy working on api.chess.com, but would an api for chesskid.com work? I don't think that it could be public though do to it being "100% Safe!". But would it come some time in the future?

This link works fine on the site https://www.chess.com/club/matches/1510381 But the API lookup of the match fails. curl https://api.chess.com/pub/match/1510381 {"code":0,"message":"An internal error has occurred. Please contact Chess.com Developer's Forum for further help https://www.chess.com/club/chess-com-developer-community ."}

Returns this comment at the end of the string, following Registration matches. ,"comment":"Results are temporarily reduced to the most recent 500 matches for performance reasons" This is not shown in the spec for the end point as far as I can see.

A new chess board And apply a chess.com system?

Game URL format update: The `/pub/player/{username}/games/{yyyy}/{mm}` endpoint now uses a uuid for the url instead of large integer and has a slightly different path. So `https://www.chess.com/game/live/4795281310` is now `https://www.chess.com/game/a6e9f7d8-8b7f-11ea-9bde-eb3d40010001` although both urls still work and the legacy url is still present in the pgn data. This was first reported two weeks ago but I'm not sure exactly when it was changed as I couldn't find an official change log aside from the inactive pinned topic. Potentially new values in the results: I got these based off an old blog post I made where I put an example of what the endpoint returns but I'm not sure if I removed any values for brevity when I posted. Please correct me if you happen to have a more accurate version of the endpoint. rated - Boolean: true/false value probably representing if the user was playing rated chess? eco - String: This is a url to the chess.com wiki for the opening in the game, this was and still is available via the pgn data but it's nice that they put it there so we don't have to parse pgn data to get it. I should note that this was previously available and documented but was removed at some point. white.uuid and black.uuid - String: I'm not sure what these do but they are present. tcn - String: Possibly an encoded string representing the moves of a game. I'm not sure what encoding was used but it might be related to the implementation of web based stockfish https://github.com/lichess-org/stockfish.wasminitial_setup - String: I have been unable to find an example where this was populated but I'm guessing it has something to do with custom games with a custom setup---In this image I've underlined what I think they added in green and what they changed in red

When people go to settings nothing works... for last week 'till today on my chromebook

Example for member @rendiorton   Games last 90 days TO last 90 days TO Web stats API Calculated TO Last 20 games Standard 152 66 46% 0% 43% 0% Chess960 7 3 42% 35% 43% 35%   There appears to be no logic to the approach and no thought into how these results are presented.  How can this be trusted with the obvious inaccuracies?

can someone add this mode when it hides the rateing of my oppents? temorarly ofc tho.

Hi, The end point to get the members of club May the chess be with you gives an internal error and returns no data. The same API for other clubs seems works correctly. It's been like this for several days. https://api.chess.com/pub/club/may-the-chess-be-with-you/members Returns: {"code":0,"message":"An internal error has occurred.Please contact Chess.com Developer's Forum for further help https://www.chess.com/club/chess-com-developer-community ."} Can you check it? Thanks.

The creation of this guide may lead to blockades within the unofficial API, as it is not known if one or more pieces of data this guide contains may be purposely hidden by Chess.com for legal or their own reasons. However I hope this guide will not have a capacity to be used abusively. Let's start with a link to the official API documentation https://www.chess.com/news/view/published-data-api If you're still here you want undocumented stuff. Let me warn what it means to use undocumented endpoints: List of endpoints that don't exist:1. About Me in a player's profile I will send links and mention what useful stuff I found in them. In all of them, the website will look like this, with {username} replaced by hikaru, for hikaru's account: https://www.chess.com/callback/user/popup/{username} Let's start: https://www.chess.com/callback/user/popup/hikaru This is generated from trying to message hikaru, and answers the following questions?What's your status*? Are you a staff? What type of premium do you have? Can I gift you a premium subscription, and why? what's your Country ID? Are we friends? Did I send you a friend request? Did you send me a friend request? What's your top puzzle rush score? What's your best rating? In what time control your best rating is? * Status is not Biography of the user, it's the 50 character status as you input directly in your profile page. I will be honest. I don't have anything else, so I will let you know how to get the PGN of a game by its URL Step 1: Take a random URL you need. I will use this: https://www.chess.com/game/live/15360860817 Step 2: Go to this endpoint, the number being the ID of the game. Notice live and game are swapped for unknown reasons: https://www.chess.com/callback/live/game/15360860817 Step 3: From the unofficial endpoint of the callback fetch the date of the game. Step 4: Use the official API to fetch all games within the same month of one of the participants ( top or bottom ) Step 5: Find the URL of the game within the result, as the URL itself is given. Step 6: You also get a PGN. Step 7: ???? Profit https://www.chess.com/callback/member/activity/hikaru?page=1 This endpoint allows you to see hikaru's recent activity over Chess.com Let me know if you have other uses which you know the way to do / want to know how to do. https://www.chess.com/callback/user/games?locale=en_US&all=1&userId=15448422 This gets Hikaru's last games, which is extremely useful for some deep learning programs. The User ID of hikaru was found here, which is identical to one of the other callbacks in this guide: https://www.chess.com/callback/user/popup/hikaru https://www.chess.com/callback/live/stats/hikaru/chart?daysAgo=30&type=blitz This one finds a chart of Hikaru's changes in blitz. You can change time control and days to pinpoint data. https://www.chess.com/callback/member/stats/hikaru General stats of Hikaru from the unofficial API of Chess.com. It gives an important missing data of latest tactics rating. https://www.chess.com/callback/leagues/user-league/search/hikaru League stats of Hikaru from the unofficial API of Chess.com

Just wanted to share my progress on a Chess Gif Maker I'm currently working on.Got it to where you can choose custom colors, pieces, resolution, etc. just working on figuring out how I can make it faster and what I can do to make it better. Like ui, etc. Here's some results from exploration.

Hi guys,  When pulling the API: https://api.chess.com/pub/player/skywood55/games/2024/11, The game with the UUID:3f906267-a28d-11ef-bc0e-5206c001000f The PGN says this is an indian game black knights tango, when it is pretty far from that. Real Indian Game Black Knights tango:1.d4 Nf6 2.c4 Nc6 This game (Scotch Game): 1.e4 e5 2.Nf3 Nc6 3.d4 This game is a Scotch game and it even says so when you are doing an analysis on the game. Is this a mistake in the API or is it deciding that it somehow transposed into a bizarre Indian game black knights tango? Has anyone else seen errors like this in the data? I am working on a project and I have run into this and if there is errors in the data like this it would essentially ruin my project. I would have to clean my data once a month which would take way too long. 

Hi, I'm a developer and for my personal use, I'd like to programmatically fetch my game reviews. I'd like to monitor for example game accuracy or number of blunders etc. I don't plan to make a product out of this   but it's only for my personal use. Is it still possible to get access to such APIs?  thanks

Hi All, I recently made a chrome extension to calculate attackers and defenders for each piece, identify hanging pieces, and assess whether you can gain material in exchanges. The extension is not mean to cheat and will only work when playing against the computer or when completing puzzles. Any and all feedback is much appreciated. https://selmetwa.github.io/blunder-watching/

Hey, first of all I wanted to thank you guys for all the hard work providing APIs and stuff! A colleague and I are working on a chess AI for a university project. Our supervisor recommended us to test our AI through matching it against real players on chess.com. But for realizing that we would need an API, which enables matchmaking, getting the current board and pushing moves on it. Probably this is the purpose for which you are developing the interactive API you are talking about here? If it is, we would like to know, when you are planning to release it and how we could use it then. Thank you for your time, I really appreciate!

Way back when I was creating the 4teamchess competitions, I calculated how many players there were by chess.com rating. I generated a spreadsheet to illustrate the differences. But now I have forgotten how I did it. Please take a look and see if you can figure out how I can update the percentage to current numbers?: Back then there were 6 million 15 thousand players. I know I used information that was readily available here. rank number pct 25000 100 89717 0.014914 373 1 373 200 195111 0.032433 811 374 1184 300 328633 0.054629 1366 1185 2549 400 470841 0.078268 1957 2550 4506 500 572374 0.095146 2379 4507 6885 600 631917 0.105044 2626 6886 9511 700 628286 0.104440 2611 9512 12122 800 594633 0.098846 2471 12123 14593 900 516472 0.085853 2146 14594 16739 1000 442244 0.073514 1838 16740 18577 1100 359953 0.059835 1496 18578 20073 1200 293519 0.048792 1220 20074 21293 1300 230314 0.038285 957 21294 22250 1400 177690 0.029537 738 22251 22988 1500 135053 0.022450 561 22989 23550 1600 101053 0.016798 420 23551 23970 1700 74537 0.012390 310 23971 24279 1800 54458 0.009053 226 24280 24506 1900 38479 0.006396 160 24507 24666 2000 29077 0.004833 120 24667 24786 2100 19299 0.003208 80 24787 24866 2200 12724 0.002115 65 24867 24931 2300 8153 0.001355 60 24932 24991 2400 5143 0.000855 55 24992 25046 2500 2500 0.000416 50 25047 25096 2600 1744 0.000290 45 25097 25141 2700 1020 0.000170 40 25142 25181 2800 490 0.000081 35 25182 25216 2900 220 0.000037 30 25217 25246 3000 90 0.000015 20 25247 25266 3100 14 0.000002 14 25267 25280 3200 2 0.000000 2 25381 25282 6015760 25282 6015760

Seems this endpoint for player results, has been changed without any notice . This is the spec: "results": [ "played_as_white": "win", //result of game played as white, see "Game results codes" section "played_as_black": "win" //result of game played as black, see "Game results codes" section ], Always has been as_white with "," terminator followed by as_black and "]" terminator.Now in some cases it is reversed.How can changes like this be implemented without any specification change? This is out of control. Another instance of total lack of software quality assurance.

Just noticed this for the following member:- https://www.chess.com/member/pawn314159 The web 'last online' date clearly states Oct 26, 2022 wherever that data appears but the member's endpoint disagrees:- https://api.chess.com/pub/player/pawn314159 "last_online":1667598759 When I decode the time integer I get this:- tm_year=2022, tm_mon=11, tm_mday=4, tm_hour=21, tm_min=52, tm_sec=39, ..... i.e. Nov 4, 2022 I think I'm reading that correctly.

So im admin in a 1750 members club and the owner asked me to make a list of which countries have the most ammount of people in them. Im working on it but is there a faster way than just looking at the member list to update 1 person and do it 1750 times???