excuse moi but 9 pool vs 12 pool is still very playable... its like 12 hatch vs 12 pool -_-. For instance if bases are not close, dont research speed and lay down a hatch, then 2-3 more drones and start gas a gain... and the 12 pooler will have to make lings instead of drones unless he makes a sunk..

and if he does, he auto-gives you map control. and wasting 175 that could have been 6 lings and not handed over map control