The phrase "opposite tack" means to take a completely different approach or direction. It refers to doing the opposite of what was done before in order to achieve a different outcome. Full definition
It took me a little while to realise this, but Moon Hunters takes the exact opposite tack in its use of procedural generation. (rogueprocess.run)
On the other hand, Netflix is taking the opposite tack to 3D, which it announced on a test basis in the United States earlier this year. (canadianbusiness.com)
As someone who owns and uses phones from both sides of the fence, though, I thought it'd be fun to see if I could still take the opposite tack. (businessinsider.com)