Now, it's rather hard, no?
When u turn cards(to find your BID of red gnomes) u may never turn a card were no red gnomes are present.
For example :
u bid 12 red gnomes,
u start turning cards, there are 5 red gnomes on the first card u turn, but on the next card u turn there is only one blue gnome and no reds !!!
Now your turn is over and u do not collect points.