Actually Hard Games?

I noticed some years ago that it's been a while since I played a game that was actually hard. Not "die a thousand times until you learn the meta" hard, but actually mechanically hard to play beyond preparation. Something that involves actual skill and knowledge to beat. Anyone got any ideas?

Update: Old games that only people above the age range of 30+ play don't count because no one but old people are going to realistically bother with those. Superman 64 also doesn't count because it's only hard because it's broken fundamentally. Backgammon does count because it's one of the world's oldest games.