counter

Rust version of the counter chess engine. Supports NNUE evaluation on Apple Silicon. Currently early alpha version, single thread search only.

You need to have nnue file in working dir, binary dir or ~/chess dir.

Motivation for migrate from go to rust

Go does not help you to use SIMD instructions. In the era of deep learning SIMD calculations play a big role. Rust supports auto-vectorization, so your code can be effective on different CPUs. For example, calculate dotProduct(RELU(hidden_outputs), wieghts):

	hidden_outputs
            .iter()
            .zip(weights.iter())
            .fold(0_f32, |acc, (&x, &w)| unsafe {
                std::intrinsics::fadd_fast(acc, x.max(0_f32) * w)
            });

Manual compilation

Install nightly rust version to use std::intrinsics::fadd_fast:

$ rustup toolchain install nightly

Use nightly for project:

$ cd ~/projects/counter
$ rustup override set nightly

Build binary:

$ cargo build --release

Or optimize for you processor with possible better performance:

$ RUSTFLAGS='-C target-cpu=native' cargo build --release