I am trying to use stockfish to evaluate a chess position using FEN notation all in Python. I am mainly using two libraries (pgnToFen I found on github here: https://github.com/SindreSvendby/pgnToFen and Stockfish the MIT licensed one here: https://github.com/zhelyabuzhsky/stockfish). After many bugs I have reached problem after problem. Stockfish not only can't analyse this FEN position (3b2k1/1p3pp1/8/3pP1P1/pP3P2/P2pB3/6K1/8 b f3 -) but it infinitely loops! "No worries!" and thought changing the source code would be accomplishable. Changed to _put(), but basically I am unable to put dummy values in because stdin.flush() won't execute once I give it those values! Meaning I don't even think I can skip to the next row in my dataframe. :( The code I changed is below.
def _put(self, command: str, tmp_time) -> None:
if not self.stockfish.stdin:
raise BrokenPipeError()
self.stockfish.stdin.write(f"{command}\n")
try:
self.stockfish.stdin.flush()
except:
if command != "quit":
self.stockfish.stdin.write('isready\n')
try:
time.sleep(tmp_time)
self.stockfish.stdin.flush()
except:
#print ('Imma head out', file=sys.stderr)
raise ValueError('Imma head out...')
#sys.stderr.close()
def get_evaluation(self) -> dict:
"""Evaluates current position
Returns:
A dictionary of the current advantage with "type" as "cp" (centipawns) or "mate" (checkmate in)
"""
evaluation = dict()
fen_position = self.get_fen_position()
if "w" in fen_position: # w can only be in FEN if it is whites move
compare = 1
else: # stockfish shows advantage relative to current player, convention is to do white positive
compare = -1
self._put(f"position {fen_position}", 5)
self._go()
x=0
while True:
x=x+1
text = self._read_line()
#print(text)
splitted_text = text.split(" ")
if splitted_text[0] == "info":
for n in range(len(splitted_text)):
if splitted_text[n] == "score":
evaluation = {
"type": splitted_text[n + 1],
"value": int(splitted_text[n + 2]) * compare,
}
elif splitted_text[0] == "bestmove":
return evaluation
elif x == 500:
evaluation = {
"type": 'cp',
"value": 10000,
}
return evaluation
and last but not least change to the init_ contructor below:
self._stockfish_major_version: float = float(self._read_line().split(" ")[1])
And the code where I am importing this code to is below, this is where errors pop up.
import pandas as pd
import re
import nltk
import numpy as np
from stockfish import Stockfish
import os
import sys
sys.path.insert(0, r'C:\Users\path\to\pgntofen')
import pgntofen
#nltk.download('punkt')
#Changed models.py for major version line 39 in stockfish from int to float
stockfish = Stockfish(r"C:\Users\path\to\Stockfish.exe")
file = r'C:\Users\path\to\selenium-pandas output.csv'
chunksize = 10 ** 6
for chunk in pd.read_csv(file, chunksize=chunksize):
for index, row in chunk.iterrows():
FullMovesStr = str(row['FullMoves'])
FullMovesStr = FullMovesStr.replace('+', '')
if "e.p" in FullMovesStr:
row.to_csv(r'C:\Users\MyName\Logger.csv', header=None, index=False, mode='a')
print('Enpassant')
continue
tokens = nltk.word_tokenize(FullMovesStr)
movelist = []
for tokenit in range(len(tokens)):
if "." in str(tokens[tokenit]):
try:
tokenstripped = re.sub(r"[0-9]+\.", "", tokens[tokenit])
token = [tokenstripped, tokens[tokenit+1]]
movelist.append(token)
except:
continue
else:
continue
DFMoves = pd.DataFrame(movelist, columns=[['WhiteMove', 'BlackMove']])
DFMoves['index'] = row['index']
DFMoves['Date'] = row['Date']
DFMoves['White'] = row['White']
DFMoves['Black'] = row['Black']
DFMoves['W ELO'] = row['W ELO']
DFMoves['B ELO'] = row['B ELO']
DFMoves['Av ELO'] = row['Av ELO']
DFMoves['Event'] = row['Event']
DFMoves['Site'] = row['Site']
DFMoves['ECO'] = row['ECO']
DFMoves['Opening'] = row['Opening']
pd.set_option('display.max_rows', DFMoves.shape[0]+1)
print(DFMoves[['WhiteMove', 'BlackMove']])
seqmoves = []
#seqmovesBlack = []
evalmove = []
pgnConverter = pgntofen.PgnToFen()
#stockfish.set_fen_position("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
#rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
for index, row in DFMoves.iterrows():
try:
stockfish.set_fen_position("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
except:
evalmove.append("?")
continue
#stockfish.set_fen_position("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
pgnConverter.resetBoard()
WhiteMove = str(row['WhiteMove'])
BlackMove = str(row['BlackMove'])
if index == 0:
PGNMoves1 = [WhiteMove]
seqmoves.append(WhiteMove)
#seqmoves.append(BlackMove)
else:
seqmoves.append(WhiteMove)
#seqmoves.append(BlackMove)
PGNMoves1 = seqmoves.copy()
#print(seqmoves)
try:
pgnConverter.pgnToFen(PGNMoves1)
fen = pgnConverter.getFullFen()
except:
break
try:
stockfish.set_fen_position(fen)
print(stockfish.get_board_visual())
evalpos = stockfish.get_evaluation()
evalmove.append(evalpos)
except:
pass
try:
stockfish.set_fen_position("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
except:
evalmove.append("?")
continue
pgnConverter.resetBoard()
if index == 0:
PGNMoves2 = [WhiteMove, BlackMove]
seqmoves.append(BlackMove)
else:
seqmoves.append(BlackMove)
PGNMoves2 = seqmoves.copy()
try:
pgnConverter.pgnToFen(PGNMoves2)
fen = pgnConverter.getFullFen()
except:
break
try:
stockfish.set_fen_position(fen)
print(stockfish.get_board_visual())
evalpos = stockfish.get_evaluation()
print(evalpos)
evalmove.append(evalpos)
except:
pass
#DFMoves['EvalWhite'] = evalwhite
#DFMoves['EvalBlack'] = evalblack
print(evalmove)
So the detailed question is getting stockfish.get_evalution() to just skip, or better yet fix the problem, for this ( 3b2k1/1p3pp1/8/3pP1P1/pP3P2/P2pB3/6K1/8 b f3 - ) FEN position. I have been working on this problem for quite a while so any insight into this would be very much appreciated.
My specs are Windows 10, Python 3.9, Processor:Intel(R) Core(TM) i9-10980XE CPU @ 3.00GHz 3.00 GHz and RAM is 64.0 GB.
Thanks :)
