rot100

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

Source code:

import random

k2i={'R':0,'P':1,'S':2}
i2k={0:'R',1:'P',2:'S'}

def mdl(N):
    N%=3
    if N<0:
       N+=3
    return N

if not input:
   DNA=[""]*3
   flag=False
   subs=[0]*6
   prin=[[0]*6]*3
   meta=[0]*3
   output=random.choice("RPS")
else:
   if flag:
      for i in range(3):
          j=prin[i].index(max(prin[i]))
          k=mdl(subs[j]-k2i[input])
          if k==2:
             meta[i]-=1
          else:
             meta[i]+=k
      for j in range(6):
          for i in range(1,3):
              prin[i][j]*=0.9
          k=mdl(subs[j]-k2i[input])
          if k==1:
             for i in range(3):
                 prin[i][j]+=1
          elif k==2:
             for i in range(3):
                 if i<2:
                    prin[i][j]-=1
                 elif prin[i][j]<3:
                    prin[i][j]-=1.5
                 else:
                    prin[i][j]*=0.5
          elif prin[2][j]<3:
             prin[2][j]-=0.25
          else:
             prin[2][j]=0.75*prin[2][j]+0.5
   DNA[0]+=input
   DNA[1]+=output
   DNA[2]+=i2k[mdl(k2i[output]-k2i[input])]
   i=min(101,len(DNA[2]))
   j=-1
   while i>1 and j<0:
         i-=1
         RNA=DNA[2][-i:]
         j=DNA[2].rfind(RNA,0,-1)
   flag=(j>=0)
   output=random.choice("RPS")
   if flag:
      k=i+j
      for i in range(2):
          for j in range(3):
              subs[3*i+j]=mdl(k2i[DNA[i][k]]-k2i[DNA[i][k-1]]+k2i[DNA[i][len(DNA[2])-1]]-j+i+1)
      i=meta.index(max(meta))
      output=i2k[subs[prin[i].index(max(prin[i]))]]