Created
December 20, 2015 15:48
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Calculation for the Chess SE question: http://chess.stackexchange.com/questions/8561/top-player-with-the-lowest-drawing-rate
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#!/usr/bin/python | |
from __future__ import division | |
from collections import Counter | |
import pgn | |
import operator | |
import os | |
from matplotlib import pyplot as plt | |
from matplotlib import rcParams | |
rcParams.update({'figure.autolayout': True}) | |
import numpy as np | |
PGN_DIR = 'pgns' | |
PGN_SUBDIRS = {'men', 'women'} | |
def calculate_draw_rates(directory): | |
pgn_files = os.listdir(os.path.join(PGN_DIR, directory)) | |
draw_rates = dict() | |
for fname in pgn_files: | |
pgn_file = open(os.path.join(PGN_DIR, directory, fname), 'r') | |
player_name = fname.split('.')[0] | |
pgn_text = pgn_file.read() | |
pgn_file.close() | |
games = pgn.loads(pgn_text) | |
results = [game.result for game in games] | |
num_games = len(results) | |
counts = Counter(results) | |
num_draws = counts['1/2-1/2'] | |
draw_rate = round(num_draws / num_games, 3) | |
draw_rates[player_name] = draw_rate | |
return draw_rates | |
def plot_draw_rates(draw_rates, directory): | |
sorted_results = sorted(draw_rates.items(), key=operator.itemgetter(1)) | |
player_names = [item[0] for item in sorted_results] | |
draws = [item[1] for item in sorted_results] | |
average_draw_rate = np.mean(draws) | |
plt.bar(range(0, len(player_names)), draws) | |
plt.axhline(y=average_draw_rate, color='red', linewidth='4', label='Average') | |
plt.xticks(range(0, len(player_names)), player_names, rotation=90) | |
plt.title("Draw rates " + directory, size=18) | |
plt.xlabel("Player name", size=14) | |
plt.ylabel("Draw rate", size=14) | |
plt.grid(True) | |
plt.legend(loc=2) | |
plt.savefig("draw_rates_"+directory+".png") | |
plt.clf() | |
plt.close() | |
for dir_entry in PGN_SUBDIRS: | |
data = calculate_draw_rates(dir_entry) | |
plot_draw_rates(data, dir_entry) |
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