2048-rs

This is a Rust implementation of the famous 2048 game which runs in the terminal.

In addition to the standard user inputs, an AI can be used to perform the moves. This AI leverages the expectiminimax algorithm to recommend the best next move at each step.

Statistics

Here are the statistics of the AI with its default parameters:

max tile reached	frequency	average time to reach max tile
2048	100 %	12s
4096	100 %	23s
8192	96 %	74s
16384	70 %	202s
32768	10 %	673s

Average times have been computed on a macbook pro 3,5 GHz Dual-Core Intel Core i7

In particular, these statistics correspond to a minimum branch probability of 0.001. Decreasing this value would lead to better performance, as more branches would be explored, but this would also take more time.

Some other hardcoded parameters can be tweaked in order to further improve the algorithm. I have not performed an exhaustive grid search, thus the parameter set is probably sub-optimal.

Installation

Rust and cargo must be installed to run this game:

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

With Cargo

cargo install play-2048

Then, in order to play:

play-2048

From source

> git clone https://github.com/adrienball/2048-rs.git
> cd 2048-rs
> cargo run --release

Usage

You can change the probability of drawing a 4 tile:

> play-2048 --proba-4 0.5

Or adjust the minimum branch probability of the expectiminimax search:

> play-2048 --min-branch-proba 0.0001

To get the list of available options, simply run:

> play-2048 --help

License

Apache 2.0/MIT

All original work licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT) at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.