UCI compliant chess engine in Rust.
This is only an engine, connect it with a gui for real usage.
Interested in how it works?
Check out the wiki at: https://github.com/fabianvdW/FabChess/wiki
Download latest release for your OS in the release section.
If you want to compile from source, make sure you have the latest version of Rust and Cargo installed, then do
git clone https://github.com/fabianvdW/FabChess.git
cd FabChess
cargo run --release
...
uci
< id name FabChess v1.13
< id author Fabian von der Warth, Contributor: Erik Imgrund
< uciok
go infinite
...
For a faster compile including popcount operation for new processors, run
cargo rustc --release --bin fabchess -- -C target-cpu=native
The binary will be in ./target/release
| Version | 40/4 | 40/40 | Comment |
|---|---|---|---|
| Latest Dev | +40 | +40 | Estimate |
| Version 1.13 | 2955-4CPU | 2840 | See CCRL |
| Version 1.12.6 | 2788 | 2762 | See CCRL |
| Version 1.12 | 2785 | - | See CCRL |
| Version 1.11 | - | 2606 | See CCRL |
| Version 1.10 | >2600 | Estimate | |
| Version 1.9.1 | 2510 | 2442 | See CCRL |
| Version 1.9 | 2534 | 2463 | See CCRL |
| Version 1.8 | 2409 | - | See CCRL |
FabChess supports more commands than the standard UCI specifies.
Use static to get a static evaluation of the position
> position startpos
> static
< cp 10
If you compile FabChess with an extra flag, it will also write a detailed overview of the evaluation to a logfile.
!!! Make sure not to run any go command with this, else it will quite literally produce a lot of text !!!
> cargo run --features "display-eval"
> position startpos
> static
< cp 10
Logfile called log.txt:
Evaluating GameState fen: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
Tempo:(10 , 15)
PSQT for White:
Pawns : (-225 , -216)
Knights: (-67 , -93)
Bishops: (-23 , -35)
Rooks: (24 , -56)
Queens: (22 , -5)
King : (47 , -88)
Sum: (-222 , -493)
PSQT for Black:
Pawns : (-225 , -216)
Knights: (-67 , -93)
Bishops: (-23 , -35)
Rooks: (24 , -56)
Queens: (22 , -5)
King : (47 , -88)
Sum: (-222 , -493)
PSQT Sum: (0 , 0)
Piece values for White
Pawns: 8 -> (888 , 1472)
Knights: 2 -> (1018 , 1588)
Bishops: 2 -> (992 , 1422)
Bishop-Pair: 1 -> (41 , 111)
Rooks: 2 -> (1310 , 2596)
Queens: 1 -> (1541 , 2449)
Sum: (5790 , 9638)
Piece values for Black
Pawns: 8 -> (888 , 1472)
Knights: 2 -> (1018 , 1588)
Bishops: 2 -> (992 , 1422)
Bishop-Pair: 1 -> (41 , 111)
Rooks: 2 -> (1310 , 2596)
Queens: 1 -> (1541 , 2449)
Sum: (5790 , 9638)
Piece value Sum: (5790 , 9638) - (5790 , 9638) -> (0 , 0)
Pawns for White:
Doubled: 0 -> (0 , 0)
Isolated: 0 -> (0 , 0)
Backward: 0 -> (0 , 0)
Supported: 0 -> (0 , 0)
Attack Center: 0 -> (0 , 0)
Mobility: 30 -> (270 , 360)
Passer Blocked/Not Blocked: 0 , 0 -> (0 , 0)
Rook behind passer: 0 -> (0 , 0)
Enemy Rook behind passer: 0 -> (0 , 0)
Weak passer: 0 -> (0 , 0)
Passers distance to kings -> (0 , 0)
Sum: (270 , 360)
Pawns for Black:
Doubled: 0 -> (0 , 0)
Isolated: 0 -> (0 , 0)
Backward: 0 -> (0 , 0)
Supported: 0 -> (0 , 0)
Attack Center: 0 -> (0 , 0)
Mobility: 30 -> (270 , 360)
Passer Blocked/Not Blocked: 0 , 0 -> (0 , 0)
Rook behind passer: 0 -> (0 , 0)
Enemy Rook behind passer: 0 -> (0 , 0)
Weak passer: 0 -> (0 , 0)
Passers distance to kings -> (0 , 0)
Sum: (270 , 360)
Pawn Sum: (270 , 360) - (270 , 360) -> (0 , 0)
Knights for White:
Supported by pawns: 0 -> (0 , 0)
Outposts: 0 -> (0 , 0)
Sum: (0 , 0)
Knights for Black:
Supported by pawns: 0 -> (0 , 0)
Outposts: 0 -> (0 , 0)
Sum: (0 , 0)
Knights Sum: (0 , 0) - (0 , 0) -> (0 , 0)
Piecewise for White:
Mobility Knight: (-10 , 22)
Mobility Bishop: (-6 , -62)
Bishop Diagonally Adj: (-54 , 106)
Mobility Rook : (-48 , -52)
Mobility Queen : (-12 , -40)
BishopXrayKing : 0 -> (0 , 0)
RookXrayKing : 0 -> (0 , 0)
QueenXrayKing : 0 -> (0 , 0)
Rooks on open : 0 -> (0 , 0)
Rooks on semi-open : 0 -> (0 , 0)
Queens on open : 0 -> (0 , 0)
Queens on semi-open : 0 -> (0 , 0)
Rooks on seventh: 0 -> (0 , 0)
Knight Attackers: Num: 0 , Val: (0 , 0)
Bishop Attackers: Num: 0 , Val: (0 , 0)
Rook Attackers: Num: 0 , Val: (0 , 0)
Queen Attackers: Num: 0 , Val: (0 , 0)
Sum Attackers: (Num: 0 , Val: (0 , 0)
Attack MG value: 0 * 0 / 100.0 -> 0
Attack EG value: 0 * -1 / 100.0 -> 0
Sum: (-130 , -26)
Piecewise for Black:
Mobility Knight: (-10 , 22)
Mobility Bishop: (-6 , -62)
Bishop Diagonally Adj: (-54 , 106)
Mobility Rook : (-48 , -52)
Mobility Queen : (-12 , -40)
BishopXrayKing : 0 -> (0 , 0)
RookXrayKing : 0 -> (0 , 0)
QueenXrayKing : 0 -> (0 , 0)
Rooks on open : 0 -> (0 , 0)
Rooks on semi-open : 0 -> (0 , 0)
Queens on open : 0 -> (0 , 0)
Queens on semi-open : 0 -> (0 , 0)
Rooks on seventh: 0 -> (0 , 0)
Knight Attackers: Num: 0 , Val: (0 , 0)
Bishop Attackers: Num: 0 , Val: (0 , 0)
Rook Attackers: Num: 0 , Val: (0 , 0)
Queen Attackers: Num: 0 , Val: (0 , 0)
Sum Attackers: (Num: 0 , Val: (0 , 0)
Attack MG value: 0 * 0 / 100.0 -> 0
Attack EG value: 0 * -1 / 100.0 -> 0
Sum: (-130 , -26)
Piecewise Sum: (-130 , -26) - (-130 , -26) -> (0 , 0)
King for White:
Shield pawn missing: 0 -> (5 , -16)
Shield pawn on open file missing: 0 -> (2 , 7)
Sum: (7 , -9)
King for Black:
Shield pawn missing: 0 -> (5 , -16)
Shield pawn on open file missing: 0 -> (2 , 7)
Sum: (7 , -9)
King Sum: (7 , -9) - (7 , -9) -> (0 , 0)
Sum: (0 , 0) + (0 , 0) + (0 , 0) + (0 , 0) + (0 , 0) + (0 , 0) + (10 , 15) -> (10 , 10) (EG/=1.5)
Phase: 128
Final Result: (10 * 128 + 10 * (128.0 - 128))/128.0 -> 10
You can run perft on an arbitrary position. Note that if there is no king on the board for either side or the position is otherwise illegal, FabChess will crash (intended).
> position startpos
> perft 6
<
a2a3: 4463267
b2b3: 5310358
c2c3: 5417640
d2d3: 8073082
e2e3: 9726018
f2f3: 4404141
g2g3: 5346260
h2h3: 4463070
a2a4: 5363555
b2b4: 5293555
c2c4: 5866666
d2d4: 8879566
e2e4: 9771632
f2f4: 4890429
g2g4: 5239875
h2h4: 5385554
g1f3: 5723523
g1h3: 4877234
b1a3: 4856835
b1c3: 5708064
119060324
Time 1.222 (97430707.03764321 nps)
Use d for a debug print of the board
> position startpos
> d
<
+---+---+---+---+---+---+---+---+
| r | n | b | q | k | b | n | r |
+---+---+---+---+---+---+---+---+
| p | p | p | p | p | p | p | p |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| P | P | P | P | P | P | P | P |
+---+---+---+---+---+---+---+---+
| R | N | B | Q | K | B | N | R |
+---+---+---+---+---+---+---+---+
Castle Rights:
White Kingside: true
White Queenside: true
Black Kingside: true
Black Queenside: true
En Passant Possible: 0
Half-Counter: 0
Full-Counter: 1
Side to Move: 0
Hash: 6214150092099736431
FEN: rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
- https://www.chessprogramming.org/Main_Page
- Stockfish
- Ethereal
- Asymptote
Special thanks to Andrew Grant for writing OpenBench, which is used for selfplay testing, in order to incrementally improve on the last versions.