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Update gtp_connection_go2.py #1

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17 changes: 12 additions & 5 deletions assignment2/Go2/gtp_connection_go2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -60,8 +60,8 @@ def safety_cmd(self, args):
except Exception as e:
self.respond('Error: {}'.format(str(e)))

def negamax(self, node, color, curtime, delta):
if int(time.time() - curtime) > delta:
def negamax(self, node, color, curtime, delta, α, β):
if (int(time.time() - curtime) > delta) or
print("score -- ", node.state.score(self.go_engine.komi))
return node.state.score(self.go_engine.komi)[0]

Expand All @@ -82,24 +82,31 @@ def negamax(self, node, color, curtime, delta):
# print(coord)
nodecopy.state.move(point, GoBoardUtil.color_to_int(color))
if color == "b":
v = -self.negamax(nodecopy, "w", curtime, delta)
v = -self.negamax(nodecopy, "w", curtime, delta, -β, -α) #alpha and beta switch with each negamax call
#print(v)
best = max(best, v)
else:
v = -self.negamax(nodecopy, "b", curtime, delta)
v = -self.negamax(nodecopy, "b", curtime, delta, -β, -α) #alpha and beta switch with each negamax call
best = max(best, v)
α = max( α, v ) #alpha-beta
if α ≥ β #alpha-beta
break #alpha-beta
#print("returning")
return best


def timelimit(self, args):
self.timelimit = args
self.respond("")

def solve(self, args):
# Create a copy of our current environment as the root of the tree.
root = node(self.board)
self.respond(self.negamax(root, GoBoardUtil.int_to_color(self.board.current_player), time.time(), self.timelimit))
α = float("-inf") #initialized to - infinity
β = float("inf") #initialized to +infinity
self.respond(self.negamax(root, GoBoardUtil.int_to_color(self.board.current_player), time.time(), self.timelimit), α, β) #alpha and beta added