AttoChess Delivers Full Chess Gameplay on 16‑bit x86 DOS in Just 278 Bytes

A new project showcases AttoChess, a fully functional chess program for DOS. The software runs on 16‑bit x86 processors and occupies only 278 bytes. Despite its tiny size, it supports complete chess rules and move validation. The code is written in assembly language to achieve extreme compression. Users can launch the program from a DOS prompt and play against the computer. The implementation demonstrates advanced techniques for size‑optimised coding. The source and documentation are hosted on a public repository. Developers can study the project to learn about low‑level optimization. The release invites challenges to create even smaller or more feature‑rich versions.