- Kryptonite. The element from Superman’s own home planet that can hurt him and ultimately kill him. Batman is certainly smart enough to get hold of a chunk of the green stuff unless it’s one of those continuities where Batman and Superman are friends (for at least awhile) and Superman actually hands over a piece of Kryptonite to Batman to use against Superman just in case Supes ever went batshit (excuse the pun) crazy.
- Mind control. Not that Batman has mind control powers but Batman has gone up against Superman when Supes has been mind controlled by others. Typically, a mind controlled Superman is generally portrayed as not being completely working at peak efficiency which gives Batman an edge.
- Planning. This is the most important key to Batman having a chance against Superman. Batman’s smart and given time to plan in advance, he can stack the odds in his favor with gimmicks, tricks and traps that can give Superman a run for his money. In Frank Miller’s The Dark Knight Returns, it’s a high level of meticulous planning that puts Batman in contention with Superman.
There was one time when Batman went after Superman with none of the aforementioned advantages. It was in the aftermath of the Death in the Family storyline where the 2nd Robin, Jason Todd, was killed. (He got better.) Batman, in a moment of anger, straight up punches Superman. Batman breaks several bones in his hand which could’ve been worse if Superman hadn’t rolled with the punch.
For more classic blog-time fun, click here for last year's Batman vs. Superman post.