Your
Red is for #1 and Yellow is for #3. Black and Blue are for #1.
It's your turn.
What is your plan?
You could play Red and rush Yellow to #1.
What are the risks?
Is there a better opportunity?
But notice that Yellow has a receiver (Blue at #3), and a pioneer (Red at #4), so it's better to play Yellow, and get a three-ball break. Further, Black could be promoted to pivot, yielding a four-ball break.
Therefore
a better plan is to play Yellow and roquet Red.
Croquet
Red to #4 (pioneer) as you takeoff to Black.
Roquet
Black. Croquet Black to the stake (pivot) and Yellow to Blue (receiver).
Roquet Blue, and you have a four-ball break going.