UngeheuerLich
Legend
I think in 3e bonuses of the same "type" don't stack.
I'm playing through Baulder's Gate (based on 2e) for the first time and I think that's the case too? Not sure, cause sometimes items stack, other times not...
In 3.0 I thought it was a really good idea at first... but after a while, there were so many different names for bonuses that you could stack way too much.
For 2e I can say that there was no general rule for stacking. I think there were limits for rings which interfered with each other and some special cases...