diff --git a/exp/board_detect.py b/exp/board_detect.py
--- a/exp/board_detect.py
+++ b/exp/board_detect.py
@@ -122,7 +122,7 @@ class BoardDetector:
 			cv.circle(stonesImg,(int(point.x),int(point.y)),2,255,-1)
 		# cv.drawContours(stonesImg,[c for (point,c) in stones],-1,255,-1)
 		show(stonesImg,"detected stones")
-		hough.update(stonesImg,5)
+		hough.update(stonesImg,3)
 		hough.extract()
 
 		# # detect lines passing through the stones