CheckAI

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Changelog ​

All notable changes to CheckAI are documented here. The format follows Keep a Changelog and the project adheres to Semantic Versioning.

[0.4.0] — 2026-03-05 ​

Added ​

  • Modern TypeScript Web UI — Complete modular rewrite with @bquery/bquery v1.4, Tailwind CSS v4, and Vite v7
    • 12 modular TypeScript source files with reactive signal-driven architecture
    • SVG chess board with click selection, legal move indicators, check highlight, board flip
    • Analysis panel with real-time polling and score formatting (including mate detection)
    • Promotion dialog, FEN/PGN toolbar tools, WebSocket indicator with auto-reconnect
    • Vite-built SPA embedded into the Rust binary via dual rust-embed (DistAssets + WebAssets fallback)
  • FEN/PGN API endpoints
    • GET /api/games/{id}/fen — Export full 6-field FEN
    • POST /api/games/fen — Create game from FEN string
    • GET /api/games/{id}/pgn — Export PGN with Seven Tag Roster
  • King safety evaluation — Pawn shield, open file penalties, enemy piece tropism
  • Piece mobility evaluation — Per-phase square counts for knights, bishops, rooks, queens
  • Static Exchange Evaluation (SEE) — Filters bad captures at low depth
  • Futility pruning — Skips quiet moves when static eval is far below alpha
  • Build script (build.rs) — Ensures web/dist/ exists at compile time so rust-embed works without a prior web build
  • Bun as frontend package manager (replaces Node.js/npm)

Changed ​

  • rust-embed uses include-exclude feature to exclude TS source from legacy embed
  • VitePress documentation updated for all new features

Fixed ​

  • Promotion dialog not showing piece symbols (read wrong data- attribute)
  • CI compile error when web/dist/ missing — added build.rs to ensure the directory exists
  • Clippy warnings: collapsed nested ifs, RangeInclusive::contains

[0.3.1] — 2026-03-02 ​

Added ​

  • VitePress documentation site — Complete project documentation built with VitePress and deployed to GitHub Pages
    • Guide: Getting Started, CLI Commands, Docker, Configuration, Web UI, Analysis Engine, Opening Book, Tablebases, Architecture, i18n
    • API Reference: REST API, WebSocket API, Analysis API with full endpoint docs and code samples
    • Agent Protocol: Overview, Game State, Move Output, Chess Rules (FIDE 2023), Special Actions, Examples
    • Local search, edit-on-GitHub links, dark mode
  • GitHub Actions workflow (docs.yml) — Auto-deploys docs to GitHub Pages on every release

[0.3.0] — 2026-03-02 ​

Added ​

  • Deep game analysis engine — Asynchronous analysis of complete games with a minimum search depth of 30 plies
    • Alpha-beta search with PVS/Negascout, transposition table (configurable, default 64 MB), null-move pruning, late move reductions, killer/history heuristics, quiescence search
    • PeSTO-style position evaluation with midgame/endgame piece-square tables, pawn structure analysis, bishop pair bonus
    • Move quality classification: Best, Excellent (≤10 cp), Good (≤25 cp), Inaccuracy (≤50 cp), Mistake (≤100 cp), Blunder (>100 cp)
    • Per-move centipawn loss, principal variation, accuracy percentages per side
    • Zobrist hashing with compile-time key generation
  • Opening book support — Polyglot .bin format reader with binary search lookups
  • Endgame tablebase support — Syzygy tablebase interface with analytical probing for common endgames (KvK, KRvK, KQvK, etc.)
  • Analysis REST API at /api/analysis/* — Architecturally isolated from player-facing endpoints
    • POST /api/analysis/game/{id} — Submit game for async analysis
    • GET /api/analysis/jobs — List all analysis jobs
    • GET /api/analysis/jobs/{id} — Get job status and results
    • DELETE /api/analysis/jobs/{id} — Cancel or delete a job
  • Docker support — Multi-stage Dockerfile, docker-compose.yml with volume mounts
  • Docker image CI — Release workflow builds and pushes Docker images to GHCR with semver tags
  • CLI flags for analysis: --book-path, --tablebase-path, --analysis-depth, --tt-size-mb

[0.2.2] — 2026-03-01 ​

Fixed ​

  • Draw offer logic: offers now persist correctly after the offerer makes a move
  • AGENT.md example 15: corrected en_passant field from null to "e3" after 1. e4

Added ​

  • 37 comprehensive unit tests covering all critical chess engine edge cases

[0.2.1] — 2026-03-01 ​

Fixed ​

  • Web UI now embedded into the binary via rust-embed, eliminating the need for an external web/ directory
  • Removed actix-files dependency in favor of rust-embed

[0.2.0] — 2026-03-01 ​

Added ​

  • Full internationalization (i18n) for all user-facing strings (8 languages)
  • CI/CD pipelines for GitHub Actions
  • Cross-platform install and uninstall scripts
  • Automatic update check on startup
  • checkai update command for self-updating

Changed ​

  • All source code comments translated to English
  • Web UI default language changed from German to English

[0.1.0] — 2025-02-28 ​

Added ​

  • Complete chess engine with full FIDE 2023 rules support
  • REST API for AI agents
  • WebSocket API with real-time event broadcasting
  • Swagger/OpenAPI documentation
  • Terminal interface with colored board display
  • Game export in text, PGN, and JSON formats
  • Game archiving with zstd compression
  • Web UI for browser-based game viewing

Released under the MIT License.

Copyright © 2025-present JosunLP