bayes8

 Author pyfex Submission date 2011-06-23 17:13:50.799223 Rating 7048 Matches played 4734 Win rate 68.61

Use rpsrunner.py to play unranked matches on your computer.

Source code:

``````# See http://overview.cc/RockPaperScissors for more information about rock, paper, scissors
# a simplified bayes7 version

from collections import defaultdict
import operator
import random

if input == "":
score = {'RR': 0, 'PP': 0, 'SS': 0, 'PR': 1, 'RS': 1, 'SP': 1,'RP': -1, 'SR': -1, 'PS': -1,}
cscore = {'RR': 'r', 'PP': 'r', 'SS': 'r', 'PR': 'b', 'RS': 'b', 'SP': 'b','RP': 'c', 'SR': 'c', 'PS': 'c',}

rps = ['R', 'P', 'S']

def counter_prob(probs):
weighted_list = []
for h in ['R', 'P', 'S']:
weighted = 0
for p in probs.keys():
points = score[h+p]
prob = probs[p]
weighted += points * prob
weighted_list.append((h, weighted))

return max(weighted_list, key=operator.itemgetter(1))[0]

played_probs = defaultdict(lambda: 1)

opp_answers = {'c': 1, 'b': 1, 'r': 1}
my_answers = {'c': 1, 'b': 1, 'r': 1}

opp2_answers = {'c': 1, 'b': 1, 'r': 1}
my2_answers = {'c': 1, 'b': 1, 'r': 1}

patterndict = defaultdict(str)
patterndict2 = defaultdict(str)

output = random.choice(["R", "P", "S"])
hist = ""
my = opp = my2 = opp2 = ""
else:
if my and opp:
if my2 and opp2:

for length in range(min(10, len(hist)), 0, -2):
pattern = patterndict[hist[-length:]]
if pattern:
for length2 in range(min(10, len(pattern)), 0, -2):
patterndict2[pattern[-length2:]] += output + input
patterndict[hist[-length:]] += output + input

played_probs[input] += 1

hist += output + input

my = opp = my2 = opp2 = ""

for length in range(min(12, len(hist)), 0, -2):
pattern = patterndict[hist[-length:]]
if pattern != "":
my = pattern[-2]
opp = pattern[-1]
for length2 in range(min(12, len(pattern)), 0, -2):
pattern2 = patterndict2[pattern[-length2:]]
if pattern2 != "":
my2 = pattern2[-2]
opp2 = pattern2[-1]
break
break

probs = {}
for hand in rps:
probs[hand] = played_probs[hand]

if my and opp:
for hand in rps: