Bitboard chess engine written from scratch in C#
v0.3.0 is playable on lichess
- PeStO's Evaluation Function
- Negamax
- Alpha-Beta Pruning
- Iterative Deepening
- Transposition Tables
- Move Ordering
- Null Move Forward Pruning
- Quiescence Search
- Principal Variation Search
- Killer Heuristic
- History Heuristic
| Version | BLITZ 2+1 | 40/2 FRC | 40/15 |
|---|---|---|---|
| 0.1.0 | ? | ? | ? |
| 0.2.0 | ? | ? | ? |
| 0.3.0 | 1984 | ? | ? |
By default, the engine starts with a search at a certain depth, in order to "pre compile" some of the code that's going to run during the search. You can disable this by starting the engine with the --fastinit flag.
help
uci
output
id name Lxna
id author Lxdovic
uciok
isready
output
readyok
ucinewgame
output
8 ♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜
7 ♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟
6
5
4
3
2 ♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟
1 ♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜
a b c d e f g h
SideToMove: White
EnPassant: NoSquare
Castling: KQkq
position [fen <fenstring> | startpos] moves <move1> ... <movei>
example input
position fen r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - moves e2a6 b4c3
example output
8 ♜ ♚ ♜
7 ♟ ♟ ♟ ♛ ♟ ♝
6 ♝ ♞ ♟ ♞ ♟
5 ♟ ♞
4 ♟
3 ♟ ♛ ♟
2 ♟ ♟ ♟ ♝ ♟ ♟ ♟
1 ♜ ♚ ♜
a b c d e f g h
SideToMove: White
EnPassant: NoSquare
Castling: KQkq
example input
go
- Search x plies
depth <x> - Search with x time (ms) left on the clock for white
wtime <x> - Search with x time (ms) left on the clock for black
btime <x> - Search until the stop command is called
infinite - Executes a performance test x plies
example input
perft <x>
go depth 8
example output
move F3F6 depth 1 score 330, nodes 52 time 77ms
move B2C3 depth 2 score 20, nodes 120 time 77ms
move D2G5 depth 3 score 230, nodes 3,269 time 78ms
move B2C3 depth 4 score -80, nodes 5,223 time 82ms
move B2C3 depth 5 score 120, nodes 77,864 time 114ms
move D2C3 depth 6 score -110, nodes 81,983 time 170ms
move D2C3 depth 7 score 190, nodes 751,752 time 342ms
move D2C3 depth 8 score -210, nodes 469,464 time 613ms
bestmove d2c3
example input
go perft 5
example output
move A2A3 nodes 181,046 KN/s 7,872 time: 23
move A2A4 nodes 217,832 KN/s 9,729 time: 41
move B2B3 nodes 215,255 KN/s 10,588 time: 58
move B2B4 nodes 216,145 KN/s 11,220 time: 74
move C2C3 nodes 222,861 KN/s 11,447 time: 92
move C2C4 nodes 240,082 KN/s 11,651 time: 111
move D2D3 nodes 328,511 KN/s 11,924 time: 136
move D2D4 nodes 361,790 KN/s 12,169 time: 163
move E2E3 nodes 402,988 KN/s 12,365 time: 193
move E2E4 nodes 405,385 KN/s 12,464 time: 224
move F2F3 nodes 178,889 KN/s 12,482 time: 239
move F2F4 nodes 198,473 KN/s 12,477 time: 254
move G2G3 nodes 217,210 KN/s 12,542 time: 270
move G2G4 nodes 214,048 KN/s 12,545 time: 287
move H2H3 nodes 181,044 KN/s 12,522 time: 302
move H2H4 nodes 218,829 KN/s 12,540 time: 319
move B1A3 nodes 198,572 KN/s 12,572 time: 334
move B1C3 nodes 234,656 KN/s 12,596 time: 352
move G1F3 nodes 233,491 KN/s 12,614 time: 370
move G1H3 nodes 198,502 KN/s 12,605 time: 386
perft depth 5 nodes 4,865,609 time 386
stop
move <move>
example input
move e2e4
example output
8 ♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜
7 ♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟
6
5
4 ♟
3
2 ♟ ♟ ♟ ♟ ♟ ♟ ♟
1 ♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜
a b c d e f g h
SideToMove: Black
EnPassant: E3
Castling: KQkq
fen
quit
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