diff --git a/common/boardp.h b/common/boardp.h
index 3044edf91..155bcefb4 100644
--- a/common/boardp.h
+++ b/common/boardp.h
@@ -178,6 +178,8 @@ XP_Bool moveTileToArrowLoc( BoardCtxt* board, XP_U8 index );
 XP_U16 indexForBits( XP_U8 bits );
 XP_Bool rectContainsPt( XP_Rect* rect1, XP_U16 x, XP_U16 y );
 XP_Bool checkRevealTray( BoardCtxt* board );
+void invalTilesUnderRect( BoardCtxt* board, XP_Rect* rect );
+XP_Bool rectsIntersect( XP_Rect* rect1, XP_Rect* rect2 );
 
 #ifdef KEYBOARD_NAV
 XP_Bool tray_moveCursor( BoardCtxt* board, XP_Key cursorKey );