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Update gtp_connection_go2.py #2

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16 changes: 11 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 @@ -56,7 +56,7 @@ def safety_cmd(self, args):
except Exception as e:
self.respond('Error: {}'.format(str(e)))

def negamax(self, pnode, color, curtime, delta):
def negamax(self, pnode, color, curtime, delta, α, β):
if int(time.time() - curtime) > delta:
#If the timelimit is passed, just return the heuristic value of the move
return pnode.state.score(self.go_engine.komi)
Expand Down Expand Up @@ -88,11 +88,13 @@ def negamax(self, pnode, color, curtime, delta):
return pnode.state.score(self.go_engine.komi)

if color == "b":
moved, score = self.negamax(nodecopy, "w", curtime, delta)
moved, score = self.negamax(nodecopy, "w", curtime, delta, -β, -α)

else:
moved, score = self.negamax(nodecopy, "b", curtime, delta)

moved, score = self.negamax(nodecopy, "b", curtime, delta, -β, -α)
α = max( α, v ) #alpha-beta
if α ≥ β #alpha-beta
break #alpha-beta
#best = max(best, score)
if(best < -score):
best = -score
Expand All @@ -113,10 +115,14 @@ def timelimit(self, args):
def solve(self, args):
# Create a copy of our current environment as the root of the tree.
root = node(self.board)
α = float("-inf") #initialized to - infinity
β = float("inf") #initialized to +infinity
negamaxResult = self.negamax(root,
GoBoardUtil.int_to_color(self.board.current_player),
time.time(),
self.timelimit
self.timelimit,
α,
β
)
#print(negamaxResult)
self.respond("{0} {1}".format(GoBoardUtil.int_to_color(negamaxResult[0]), ""))
Expand Down