ok, thank you both for the answers!

i tried to do a spacewar remake and it was almost finished when i found out that the controls don't work properly when 2 players play seriously. the strange thing is that pressing all the keys worked with the old spacewar for dos from the eighties. maybe keyboards were designed differently 15 years ago?

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To make things worse, different keyboards can act differently.

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is there a minimum number of simultanously pressed keys that is surely supported with every keyboard so that i can design controls of future games with that in mind? are there any rules known by experienced game developers to follow?

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So, I see only the solution that one player plays with joystick.

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a gamepad would be great for spacewar but i (and i think the majority of pc users) don't have one.