diff --git a/src/core.py b/src/core.py
--- a/src/core.py
+++ b/src/core.py
@@ -47,8 +47,12 @@ class Core:
 		self._imgIndex=(self._imgIndex+step)%len(self._imgs)
 		imgPath=os.path.join(cfg.misc.imgDir,self._imgs[self._imgIndex])
 		self._frame=PIL.Image.open(imgPath)
-		self._guiMessages.send("setCurrentFrame",(self._frame.copy(),))
-		self.analyze()
+		self._guiMessages.send("setCurrentFrame",(self._frame.copy(),gui.PREVIEW))
+		self.preview()
+
+	def preview(self):
+		if self.detector.analyze(self._frame):
+			self._guiMessages.send("setGameState", (self.detector.board,[]))
 
 	def analyze(self):
 		if self.detector.analyze(self._frame):