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Chess player: Difference between revisions
→{{header|Python}}: add a simple Python engine using python-chess
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==={{libheader|VPython}}===
There is a 3D-Chess-Board in the [http://vpython.org/contents/contributed/chessboard.py VPython contributed section].
==={{libheader|python-chess}}===
A very simple chess engine (two-ply search plus mobility) using [https://github.com/niklasf/python-chess python-chess]. The computer plays Black.
The default Unicode board may look wonky and misaligned with certain terminal fonts. To use an ASCII board instead (like shown below), replace "print(board.unicode())" with "print(board)".
<lang python># Simple Python chess engine
# Computer plays Black
import sys, chess
from collections import Counter
board = chess.Board()
while not board.outcome():
while True:
try:
move = input("Your move? ")
if move == "quit": sys.exit()
board.push_uci(move)
except ValueError: print("Sorry?")
else: break
moves = {}
for mymove in board.legal_moves:
board.push(mymove)
for yourmove in board.legal_moves:
board.push(yourmove)
v = Counter(board.fen().split()[0])
p = (9 * (v['q']-v['Q']) + 5 * (v['r']-v['R']) + 3 * (v['b']-v['B'])
+ 3 * (v['n']-v['N']) + v['p'] - v['P'])
mobility = len(list(board.legal_moves))
p += mobility / 1000
#print(mymove, yourmove, p)
old = moves.get(mymove, 1e6)
if p < old: moves[mymove] = p
board.pop()
board.pop()
try: sel = sorted(moves.items(), key=lambda item: -item[1])[0][0]
except: break
print(sel)
board.push(sel)
print(board.unicode())
print(f"Game finished, result is {board.result()}")</lang>
{{Output}} (in ASCII)
<pre>$ python3 simplechess.py
Your move? e2e4
e7e6
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
Your move? g1f3
d8f6
r n b . k b n r
p p p p . p p p
. . . . p q . .
. . . . . . . .
. . . . P . . .
. . . . . N . .
P P P P . P P P
R N B Q K B . R
Your move?</pre>
Here is the PGN of a full game against Stockfish. Like many simple chess engines, it has an unfortunate tendency to rush out with its Queen early in the game, leading to its loss:
<pre>
[Event "Stockfish vs Python World Championship"]
[Site "Rosetta Code"]
[Date "2022.05.08"]
[Round "1"]
[White "Stockfish"]
[Black "Python Simple Chess"]
[Result "1-0"]
1.e4 e6 2.Nf3 Qf6 3.Nc3 Qf4 4.d4 Qg4 5.Be2 Qxg2 6.Rg1 Qh3 7.Bg5 Nc6 8.Rg3
Qh5 9.Nh4 Qxg5 10.Rxg5 Bd6 11.Rxg7 Nf6 12.e5 Bxe5 13.dxe5 Nxe5 14.Qd4 Ke7
15.Qxe5 Ne8 16.Qg5+ Kd6 17.O-O-O+ Kc6 18.Qb5# 1-0
</pre>
=={{header|Wren}}==
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