You have a small number of moves to get the anchors down.
Work on clearing squares to drill down through the middle. Make sure that the square you’re clearing is going to clear a dot touching some part of the flame.
Be sure not to clear down to the bottom without having a solid route to continue clearing fire dots, because once you separate the fire, it will grow twice as fast.
Once you’ve split the fire, you’ll want to use squares to continue clearing dots that touch both sections of fire if possible.
Maintain a relatively clean board, because you’ll need to make a few squares after the first four anchors drop in order to hit your 6 anchor quota.