It seems that computers can beat the majority of chess players out there, and at the current rate in which distributed computing is going, it seems like the #1 chess player out there will be computers these days.

However, this is different with Go, as the best AI available out there cannot beat a decent player.

Are there any chess variants, which while still maintaining some sort of similarity with chess, cannot be effectively played by a computer, while still playable by humans at a level better than AIs?

I was thinking a bigger board with more pieces would help, but rules changes might be needed as well to change the gameplay a bit. But I suppose the further you drift from the original chess game, the less interest people might have on it.