 If nobody has yet spoken, guess that your hat is black if you can see fewer black hats than white hats, or white if you can see fewer white hats than black hats.
<meaning-changed>  If nobody has yet spoken, guess that your hat is black if you can see fewer black hats than white hats, or white if you can see fewer white hats than black hats.
 If nobody has yet spoken, guess that your hat is blue if you can see fewer black hats than white hats, or white if you can see fewer white hats than black hats.