diff --git a/www/js/interface.js b/www/js/interface.js
index e319b02..6b8a187 100644
--- a/www/js/interface.js
+++ b/www/js/interface.js
@@ -951,8 +951,8 @@ const INTERFACE = {
                     let fr = INTERFACE.HexVertex[nmove];
                     let to = INTERFACE.HexVertex[(nmove + 1) % 6];
 
-                    let ifr = INTERFACE.HexVertex[(nmove + 4) % 6];
-                    let ito = INTERFACE.HexVertex[(nmove + 3) % 6];
+                    let ifr = INTERFACE.HexVertex[(nmove + 5) % 6];
+                    let ito = INTERFACE.HexVertex[(nmove + 2) % 6];
         
                     let dx = (to.x - fr.x) / 3.0;
                     let dy = (to.y - fr.y) / 3.0;