# cereal2

 Author pyfex Submission date 2011-07-06 15:30:13.203937 Rating 7036 Matches played 4603 Win rate 72.69

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

## Source code:

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

if input == '':
import random
import collections
rps = ['R', 'P', 'S']
beat = {'R': 'P', 'P': 'S', 'S': 'R'}
score = {'RR': 0, 'PP': 0, 'SS': 0, 'PR': 1, 'RS': 1, 'SP': 1,'RP': -1, 'SR': -1, 'PS': -1,}
beatboth = {'RR': 'P', 'PP': 'S', 'SS': 'R', 'PR': 'P', 'RS': 'R', 'SP': 'S','RP': 'P', 'SR': 'R', 'PS': 'S',}
hist = ""
patterns = collections.defaultdict(lambda: 1)
output = random.choice(rps)
rnd = 0
lastplayed = dict.fromkeys(['R', 'P', 'S'], 0)
found = 0
foundscore = 0
else:
rnd += 1
for i in range(1, min(1+len(hist)/2,5)):
patterns[hist[-i*2:]+input] += 1
hist += output+input

probs = [1, 1, 1]
for i in range(1, min(1+len(hist)/2,5)):
probs = [probs[0]*patterns[hist[-i*2:]+'R'], probs[1]*patterns[hist[-i*2:]+'P'], probs[2]*patterns[hist[-i*2:]+'S']]
s = sum(probs)
ma = max(probs)
mi = min(probs)
if s > 10 and 100 * ma / s > 90:
found += 1
output = beat[rps[probs.index(ma)]]
elif s > 10 and mi * 100/s < 10 and s > 1:
found += 1
guess = rps[:]
del guess[probs.index(mi)]
output = beatboth["".join(guess)]
else:
lastplayed[input] = rnd
m = min(lastplayed.values())
candidates = [k for k in lastplayed if lastplayed[k] != m]
if rnd-m > 7:
output = beat[random.choice(candidates)]
else:
output = random.choice(rps)``````