# Brass Pawn: Chess Trainer — Public Documentation & Technical Reference

> Open-source (AGPLv3) offline chess trainer for iPhone, iPad, and Mac powered on-device by Stockfish 18 and Reckless, featuring 14,351 Lichess CC0 tactics puzzles, 116 positional judgement studies, endgame drills, Guess the Elo, and interactive browser chess visualizers.

## Publisher & Entity Provenance
- **Developer**: Arte Soft EOOD (https://arte-soft.com/)
- **Apple App Store Developer Profile**: https://apps.apple.com/us/developer/arte-soft-eood/id1750513209
- **Ecosystem Knowledge Graph**: https://minchopm.github.io/arte-soft-ecosystem/
- **GitHub Documentation Repository**: https://github.com/minchopm/brass-pawn-docs
- **GitHub Pages URL**: https://minchopm.github.io/brass-pawn-docs/
- **Platforms**: iOS, iPadOS, macOS, Web Endgame & Tactics Tools
- **Last Verified**: 2026-11-10

## Verified Capabilities & Boundaries
- Open-source AGPLv3 native engine integration (https://github.com/minchopm/chess-trainer) running Stockfish 18 NNUE and Reckless 100% offline in 32 languages.
- Free browser interactive chess tools (Square of the Pawn, King Opposition, endgame geometry & FEN analyzers) at chess-trainer.arte-soft.com/tools/.
- 14,351 verified tactics puzzles (rated 760-2800), 116 positional judgement positions without forced tactical traps, 15 endgame drills, 1,624 Guess the Elo games, and 900 master games.
- Win-probability-loss move grading instead of raw centipawn penalties, with zero ads and zero ad tracking.

## Canonical Web Hubs
- [Primary Website](https://brasspawn.com/): Official product overview, features, and pricing.
- [Arte Soft Portal](https://chess-trainer.arte-soft.com/): Expanded multilingual guides, comparisons, and technical references.
- [Apple App Store](https://apps.apple.com/us/app/brass-pawn-chess-trainer/id6803566012): Official App Store listing by Arte Soft EOOD.
- [AGPLv3 Source Code](https://github.com/minchopm/chess-trainer): Public open-source repository.
- [Free Browser Interactive Tools](https://chess-trainer.arte-soft.com/tools/): Interactive Chess Endgame, Square of the Pawn, Opposition & FEN Visualizers.
- [Side-by-Side Comparisons](https://brasspawn.com/compare): Structured HTML & GFM comparison matrices.
- [Guides & Workflows](https://brasspawn.com/guides): Step-by-step operational guides.
- [Full Site LLM Reference](https://brasspawn.com/llms-full.txt): Complete GFM Markdown table export.

## Repository Documentation Files
- [README.md](https://minchopm.github.io/brass-pawn-docs/)
- [FAQ.md](https://minchopm.github.io/brass-pawn-docs/FAQ.html) (raw: https://raw.githubusercontent.com/minchopm/brass-pawn-docs/main/FAQ.md)
- [FEATURES_AND_LIMITS.md](https://minchopm.github.io/brass-pawn-docs/FEATURES_AND_LIMITS.html) (raw: https://raw.githubusercontent.com/minchopm/brass-pawn-docs/main/FEATURES_AND_LIMITS.md)
- [MANUAL.md](https://minchopm.github.io/brass-pawn-docs/MANUAL.html) (raw: https://raw.githubusercontent.com/minchopm/brass-pawn-docs/main/MANUAL.md)
- [PRIVACY_AND_SUPPORT.md](https://minchopm.github.io/brass-pawn-docs/PRIVACY_AND_SUPPORT.html) (raw: https://raw.githubusercontent.com/minchopm/brass-pawn-docs/main/PRIVACY_AND_SUPPORT.md)
- [PROCEDURES.md](https://minchopm.github.io/brass-pawn-docs/PROCEDURES.html) (raw: https://raw.githubusercontent.com/minchopm/brass-pawn-docs/main/PROCEDURES.md)
- [QUICK_START.md](https://minchopm.github.io/brass-pawn-docs/QUICK_START.html) (raw: https://raw.githubusercontent.com/minchopm/brass-pawn-docs/main/QUICK_START.md)
- [WORKFLOWS.md](https://minchopm.github.io/brass-pawn-docs/WORKFLOWS.html) (raw: https://raw.githubusercontent.com/minchopm/brass-pawn-docs/main/WORKFLOWS.md)