NNUE chess engine that compresses to less than 64kb.

The implementation was based on:

• Cfish - engine source code foundation
• Obsidian - elegant NNUE reference code
• bullet - for training NNUE
• Primer - for creating .bullet format training data, modified to improve filtering

Training data:

• source binpack training data - T77 unfiltered, T79 v6-dd, used as source data
• final bullet training data - filtered data used for training

Created for the FIDE & Google Efficient Chess AI Challenge