Recently with the new update for Quake Live , there's been some changes for the game. one of them is The Chaingun being replaced with Shotgun in Proving Grounds. I don't know if Id decided to change it for Nostalgic reasons but it is a nice Duel map. It's a Test to see if you can handle 2 Yellow Armors, No Megahealth, No Red Armor just good o'l 2 Yellow Armors. Did i mention it was the Duel map that was played competitively at the time when Quake 3 was around.

few links of what i mean:

I recommend at least a few people to try this map out in Duel.