https://eieio.games/blog/one-million-chessboards/ eieio.games by nolen royalty media & speakingblog & all workwhat's my deal Table of Contents One Million ChessboardsWhatHowCan I play eieio.games by nolen royalty media & speakingblog & all workwhat's my deal One Million Chessboards a million chessboards that anyone can play on Apr 28, 2025 I made a website. It's called One Million Chessboards. It has one million chessboards on it. Moving a piece moves it for everyone, instantly. There are no turns. You can move between boards. Loading... moving some pieces What Well last year I made this game called One Million Checkboxes. It was a pretty fun time! So I thought I'd do something like this again. I worked really hard on this one. I hope you like it. How This was the most technically challenging thing that I've worked on in a long time. I'm going to save a full technical writeup until I see how my decisions pan out, since I think there's a decent chance I'll need to make a lot of changes. But I'll summarize a few things for you. * Unlike One Million Checkboxes, I designed this for scale * The game runs on a single server (!) * The board is stored fully in-memory; it's a 2D array of 64 million uint64s * The backend is written in go. This is my first go project. * I use a single writer thread, tons of reader threads, and coordinate access to the board with a mutex * The frontend optimistically applies all moves you make immediately. It then builds up a dependency graph of the moves you've made, and backs them out if it receives a conflicting update before the server acks your move. That last part - optimistic move application with what games people sometimes call "rollback" - is about 1,600 lines of code that took me a ~7 days of fulltime work to write. I don't remember the last time I wrestled with a problem that hard! Can I play Yes! Play it here. I really hope you like this one. More updates to come :) Thanks for reading! Keep up with me on my socials Or sub to my newsletter here!