Oh, and C), you're a Mod here, so you can ask yourself if it's okay.
Now, for the sake of contributing...
Back in 4th edition, I was in a 2v2 tournament. Myself and my friend both took our Space Marines, coordinating what we had to cover as many angles as possible, and it worked. Well, mostly. Our list included a Vindicator, a Predator, a Missile squad of Devastators, and a dozen or so tactical marines backed up by a librarian.
First battle was a table quarters battle against a Grey Knights/Chaos pairing. Most of our forces were backed up against a steep cliff in a corner, whilst the Vindicator swung round our left flank. Abbadon and a large squad of Bezerkers formed up as close to us as they could get, whilst a large squad of Grey Knights struck in on the left. The battle consisted mostly of the Chaos detachment charging forward and being taken down to Abbadon, who promptly routed most of the firebase, but the Vindicator, despite losing its cannon early on, slaughtered the Grey Knights and was able to claim a table quarter. With our home quarter still contested by the Librarian and Abbadon, the tank won us the game.
Round two was the same battle in reverse, but with Victory Points (the old KP), against Blood Angels and lots of Genestealers. The BA threw out a landspeeder - the Missile squad, mounted in a tower, took it down in an instant. Genestealers and Assault Marines tried to rush our left flank - the Vindicator and half a squad with a plasma gun stopped them cold. More 'stealers rushed our right side and reached the squad there, but were held up for the rest of the game, and blocked by the Predator, which nicely filled the gap between the tower the Missile squad was camping on and the edge of the table. We won that game by a landslide.
Round three put us up against a surprisingly similar list, except it replaced the Predator with Terminators, Missiles with more troops, and the Librarian with a Captain. The board was a cityscape, covered in roads and ruins. A road ran down the right side and across the midfields of both ends, and a corridor was on our left. Vindicators and Terminators took to the left, Predator and Tacticals took to the right, and our missiles ended up on a meagre structure in the middle.
Our left flank did well to start with, the Missile squad managing to wreck the enemy Vindicator whilst the terminators managed to shrug off the worst of our fire. The right flank, however, struggled to deal with the surge of enemy troops, and missile fire was mostly deflected - or even blocked outright (damn 4th edition area terrain!) - by the ruins. The game eventually ended with most of the Terminators destroyed by the Vindicator, but with our right flank in pieces and failing fast.
The game was close, but we eventually came up with the most victory points, winning us not just the game but the tournament!
And that must have been about 7 years ago now. Crikey.