Mastermind intrigued me in the same way as the author some time ago, and I've used it as a standard problem when trying out new computational frameworks/methods ever since.

Here is my Rust version with multi-threading, SIMD, WASM running on your device inside a WebApp: https://0xbe7a.github.io/mastermind/

Repo: https://github.com/0xbe7a/mastermind

It is quite fast (1.8 Billion position pairs evaluated in 1652ms on my device) and can also exploit some symmetries inside the solution space.