diff --git a/src/go/engine.py b/src/go/engine.py
--- a/src/go/engine.py
+++ b/src/go/engine.py
@@ -64,7 +64,7 @@ class Engine:
 		startDepth=1 if colorIn==colorOut else 2
 		self._g.toMove=colorIn
 
-		for i in range(startDepth,10,2):
+		for i in range(startDepth,6,2):
 			seq=self.dfs(state2,i)
 			if seq:
 				seq.reverse()
diff --git a/src/gui/__init__.py b/src/gui/__init__.py
--- a/src/gui/__init__.py
+++ b/src/gui/__init__.py
@@ -10,6 +10,7 @@ class GUI:
 	def __init__(self):
 		self.root = tk.Tk()
 		self.root.title("OneEye {0}.{1}.{2}".format(*config.misc.version))
+		self.root.option_add('*tearOff',False) # for menu
 
 		self._coreMessages=None
 
diff --git a/src/gui/mainwindow.py b/src/gui/mainwindow.py
--- a/src/gui/mainwindow.py
+++ b/src/gui/mainwindow.py
@@ -1,6 +1,7 @@
 import tkinter as tk
 from tkinter import N,S,E,W
 
+from . import menu
 from .boardview import BoardView
 from .imgview import ImgView
 
@@ -20,6 +21,11 @@ class MainWindow(tk.Frame):
 		self.imgView.setImg(frame)
 
 	def _createWidgets(self):
+		# menu
+		self.parent.root.option_add('*tearOff',False)
+		menubar=menu.createTopBar(self.parent.root)
+		menu.createMainMenu(menubar)
+
 		# a captured frame with overlay graphics
 		self._imgWrapper=tk.Frame(self,width=480,height=360)
 		self.imgView=ImgView(self._imgWrapper,self)
diff --git a/src/gui/menu.py b/src/gui/menu.py
new file mode 100644
--- /dev/null
+++ b/src/gui/menu.py
@@ -0,0 +1,18 @@
+from tkinter import Menu
+
+
+def createTopBar(root):
+	menubar = Menu(root)
+	root['menu'] = menubar
+	return menubar
+
+
+def createMainMenu(menubar):
+	file = Menu(menubar)
+	_help = Menu(menubar)
+	menubar.add_cascade(menu=file, label='File')
+	menubar.add_cascade(menu=_help, label='Help')
+
+	file.add_command(label="Settings")
+
+	_help.add_command(label="About")