Chaos from the Spectrum days, but using the amazing modern graphics of DX11!
Or use this freeware look-a-like in the meantime (requires Silverlight).
http://www.vectorlight.net/games/chaos_tournament.aspx
Julian Gollop recently kickstarted a Chaos remake - Chaos Reborn. It's on Steam in Early Access - http://store.steampowered.com/app/319050/
It's supposed to be pretty good.