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https://github.com/lichess-org/lila-tablebase
Tablebase server
https://github.com/lichess-org/lila-tablebase
chess http-api lichess rust syzygy tablebase
Last synced: 14 days ago
JSON representation
Tablebase server
- Host: GitHub
- URL: https://github.com/lichess-org/lila-tablebase
- Owner: lichess-org
- License: agpl-3.0
- Created: 2018-04-13T10:07:08.000Z (over 6 years ago)
- Default Branch: main
- Last Pushed: 2024-07-23T22:09:14.000Z (4 months ago)
- Last Synced: 2024-08-01T15:08:48.213Z (3 months ago)
- Topics: chess, http-api, lichess, rust, syzygy, tablebase
- Language: Rust
- Homepage: https://tablebase.lichess.ovh
- Size: 778 KB
- Stars: 81
- Watchers: 8
- Forks: 14
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: COPYING
Awesome Lists containing this project
README
lila-tablebase
==============
Tablebase server for [lichess.org](https://tablebase.lichess.ovh),
based on [shakmaty-syzygy](https://crates.io/crates/shakmaty-syzygy).
Blog posts
----------
- [Optimizing the tablebase server](https://lichess.org/@/revoof/blog/optimizing-the-tablebase-server/MetV0ZQd)
- [7 piece tablebases are complete](https://lichess.org/@/lichess/blog/7-piece-syzygy-tablebases-are-complete/W3WeMyQA)
Usage
-----
```
cargo run --release -- --help
```
HTTP API
--------
### `GET /standard`
```
curl http://tablebase.lichess.ovh/standard?fen=4k3/6KP/8/8/8/8/7p/8_w_-_-_0_1
```
name | type | default | description
--- | --- | --- | ---
**fen** | string | *required* | FEN of the position. Underscores allowed.
```javascript
{
"dtz": 1, // dtz50'' with rounding or null if unknown
"precise_dtz": 1, // dtz50'' (only if guaranteed to be not rounded) or null if unknown
"dtm": 17, // depth to mate or null if unknown
"dtw": null, // depth to antichess win or null if unknown
"checkmate": false,
"stalemate": false,
"variant_win": false, // only in chess variants (atomic, antichess)
"variant_loss": false, // only in chess variants
"insufficient_material": false,
"category": "win", // win, unknown, maybe-win, cursed-win, draw, blessed-loss, maybe-loss, loss
"moves": [ // information about legal moves, best first
{
"uci": "h7h8q",
"san": "h8=Q+",
"dtz": -2,
"precise_dtz": -2,
"dtm": -16,
"dtw": null,
"zeroing": true,
"checkmate": false,
"stalemate": false,
"variant_win": false,
"variant_loss": false,
"insufficient_material": false,
"category": "loss" // loss, unknown, maybe-loss, blessed-loss, draw, cursed-win, maybe-win, win
},
// ...
]
}
```
### `GET /standard/mainline`
```
curl http://tablebase.lichess.ovh/standard/mainline?fen=4k3/6KP/8/8/8/8/7p/8_w_-_-_0_1
```
name | type | default | description
--- | --- | --- | ---
**fen** | string | *required* | FEN of the position. Underscores allowed.
```javascript
{
"dtz": 1,
"mainline": [ // dtz mainline or empty if drawn
{ "uci": "h7h8q", "san": "h8=Q+", "dtz": -2 },
{ "uci": "e8d7", "san": "Kd7", "dtz": 1 },
{ "uci": "h8h2", "san": "Qxh2", "dtz": -14 },
{ "uci": "d7c6", "san": "Kc6", "dtz": 13 },
{ "uci": "h2e5", "san": "Qe5", "dtz": -12 },
{ "uci": "c6b6", "san": "Kb6", "dtz": 11 },
{ "uci": "g7f6", "san": "Kf6", "dtz": -10 },
{ "uci": "b6a6", "san": "Ka6", "dtz": 9 },
{ "uci": "e5b2", "san": "Qb2", "dtz": -8 },
{ "uci": "a6a5", "san": "Ka5", "dtz": 7 },
{ "uci": "f6e5", "san": "Ke5", "dtz": -6 },
{ "uci": "a5a4", "san": "Ka4", "dtz": 5 },
{ "uci": "e5d4", "san": "Kd4", "dtz": -4 },
{ "uci": "a4a5", "san": "Ka5", "dtz": 3 },
{ "uci": "d4c5", "san": "Kc5", "dtz": -2 },
{ "uci": "a5a4", "san": "Ka4", "dtz": 1 },
{ "uci": "b2a2", "san": "Qa2#", "dtz": -1 }
],
"winner": "w" // (w) white, (b) black, (null) draw
}
```
Claims draw by 50-move rule as soon as possible and ends the mainline.
Error 404 if not a tablebase position or required tables not present.
### `GET /atomic`
### `GET /antichess`
Acknowledgements
----------------
Thanks to Ronald de Man for his [Syzygy endgame tables](https://github.com/syzygy1/tb).
Thanks to Bojun Guo for generating and [sharing](http://www.talkchess.com/forum/viewtopic.php?t=66797) 7-piece tables.
License
-------
lila-tablebase is licensed under the GNU Affero General Public License 3.0 (or any later version at your
option). See the COPYING file for the full license text.