Can someone help me with explanation of this code?

Question

from position import Position
import sys
class FlatMCBot(object):

result2value = { 0: 0, 1: 100, 2: -100, 3: 0 }

def __init__(self):
self.pos = Position()

self.ncnt = 0 #nodes

def _perft(self, state, d):
if d == 0:
return 1
if state.game_over() != 0:
return 1
cnt = 0 ## leafs
for m in state.legal_moves():
state.move(m)
cnt += self._perft(state, d-1)
state.is_legal(m)##??
return cnt

Answer 1

James, thanks you. Here u can find rest of code. Please help me with explanation. I have an exam on Wednesday. http://www.sololearn.com/app/JUMP_LINK__&&__python__&&__JUMP_LINK/playground/cOZ469dRP8wr/