Not feeding the winner

The player who throws the winning tile gives up the points for it. Counting the pool is how you throw fewer of them.

In this lesson: How to count how many copies of a tile are already visible, so you can judge how risky a discard is.

That five fits nothing here, so it is the tile you would throw without looking. A throw that finishes somebody else costs you the whole hand. This lesson is about looking first.