My strategies of choice:
ZvZ: 14 gas 14 pool Speedling/Roach timing -> scout and retreat if he's going mass lings or mass roaches and transition into mutas =)
ZvT: 15 hatch into 7 roach pressure if i see reactor hellion, otherwise standard play.
ZvP: 14 gas 14 pool, into speedling pressure expand if he goes gateway first, nydus allin if he goes FFE with 2 spine crawlers built at his ramp. nydus allin is the funniest strategy ever invented in sc2