@@ -322,8 +322,9 @@
 			this[y,x]=' ';
 			this[y+dy,x+dx]='R';
 			this[y+dy*2,x+dx*2]=rock;
 			robot = new Pos(y+dy,x+dx);
+			may_update ~= new Pos(y+dy*2,x+dx*2);
 		} else if('A'<=this[y+dy,x+dx] && this[y+dy,x+dx]<='I') {
 			this[y,x]=' ';
 			Pos tp = tr.target_pos(this[y+dy,x+dx]);
 			foreach(p; tr.source_pos(this[tp])) {