Probe Marc Bourzutschky's partial 8-piece tablebase.
The tablebase covers all 8-piece endgames with at least one pair of opposing pawns on the same file, short op1. This accounts for more than half of the 8-piece positions reached in practical play on Lichess.
The provided metric is Depth to Conversion (DTC), the number of moves to a capture or promotion that retains the game theoretical outcome, ignoring the 50-move rule.
https://op1.lichess.ovh/tables/
Low-level tablebase probing library adapted from a debug and research tool, mbeval.cpp.
Provides an HTTP API that can be used directly, or more conveniently via
lila-tablebase, where it
provides one of multiple metrics.
curl 'https://op1.lichess.ovh/probe?fen=R7/8/8/8/7q/2K1B2p/7P/2Bk4_w_-_-_0_1'
{
"root": 584,
"children": {
"e3g5": 0,
"e3a7": 3,
"a8c8": 0,
"c1a3": 0,
"e3b6": 3,
"a8a7": 0,
"e3d2": 4,
"a8a2": 0,
"a8f8": -583,
"c1b2": 3,
"e3c5": 0,
"e3h6": 4,
"e3d4": 6,
"a8a4": 1,
"a8b8": 0,
"c3b3": 0,
"a8e8": 0,
"a8a6": 0,
"e3f2": 1,
"a8a1": 0,
"a8h8": 1,
"c1d2": 6,
"e3g1": 3,
"e3f4": 0,
"a8a3": 0,
"a8d8": 1,
"c3b2": 0,
"c3d3": 6,
"a8g8": 0,
"a8a5": 0
}
}The server is licensed under the the GNU Affero General Public License 3.0 (or any later version at your option). See the COPYING file for the full license text.
mveval-sys is derived from mbeval.cpp, (c) Marc Bourzutschky, and
may be available under additional licenses.