Chess is as slow as the game takes when you're not playing an idiot; two people of similar skill could play for ages. Even if you made a time limit between moves it'd still take longer than caravan; which btw rarely requires much time or thinking.
Chess does obviously involve the use of tactics and strategy, but the game is a pointless concept to introduce to fallout.
Slots and caravan on the other hand, are quick, easy and reap big rewards. Minigames shouldn't be complicated or take long, they should just be a short break away from the actual game; like arcade machines or card games.
If its a pointless concept in Fallout get rid of the daft chessboard littering up the place.
Looking at New Vegas I can see, from memory, at least on place where its played, up by the Repconn Test Site (Come Fly With Me quest) sitting in the rest point just out from under the bridge where you have to investigate the ghouls.
Like all minigames, its
optional, meaning you aren't forced to play it if you really don't want to.
Caravan is only quick once you have gathered enough cards to set yourself up for wins with 10s, 9s, 8s, 6s and Kings with some Jacks, and at that its just boring when that hapens since none of the NPCs experience any difficulty changes after the first game.
Slots are boring and just [censored] imo, they have no fun about them. Go to casino > Insert caps > lose caps > repeat until win :yawn:. Where is the challenge in playing the slot machines? Two clicks and I've either lost a hand full of caps or I've won enough to buy anything I would ever need.
I would much rather Poker was in the casinos than slots since it is one of the biggest played gambling games and its more challenging.
Chess would actually require some thinking and skill on the players side rather than sheer luck or preconstructed packs of cards to win.
Chess > Slots
Chess > Caravan
Poker > Slots
Poker > Caravan
Optional =/= Mandatory