Scotch game(?)

I had a chess competition yesterday.
After the competition the first 20 players played a simultanic game against a CM (which becoming an IM in a few days).

I got of was the only one who drawed with him (in other words didn't lose), but the interesting thing, was the play in my right. Mr. CM played the white side, and the first move were like this:

I think it's called scotch game, but i am not sure. Is it possible that a master with rating of 2300+ will play this opening? What was he thinking when he played that?

It's a perfectly good opening. Kasparov even used it in world championship matches (both against Karpov and against Short), and many other grandmasters use it.

After the Ruy lopez is is probably the second most respectable opening following e4 e5, many masters play this line and it was favoured by Kasparov for some time.

Well, that's new to me. Can someone give me an example for a game that kasparov played that opening?

http://www.chessgames.com/perl/chesscollection?cid=1017006

World Championship matches:

http://www.chessgames.com/perl/chessgame?gid=1067288

http://www.chessgames.com/perl/chessgame?gid=1067287

http://www.chessgames.com/perl/chessgame?gid=1070672

http://www.chessgames.com/perl/chessgame?gid=1070683

http://www.chessgames.com/perl/chessgame?gid=1018636

Other:

http://www.chessgames.com/perl/chessgame?gid=1066645

http://www.chessgames.com/perl/chessgame?gid=1067316

http://www.chessgames.com/perl/chessgame?gid=1070620

http://www.chessgames.com/perl/chessgame?gid=1070596

http://www.chessgames.com/perl/chessgame?gid=1070700

http://www.chessgames.com/perl/chessgame?gid=1017837

http://www.chessgames.com/perl/chessgame?gid=1450425

http://www.chessgames.com/perl/chessgame?gid=1070847

http://www.chessgames.com/perl/chessgame?gid=1553234

http://www.chessgames.com/perl/chessgame?gid=1070921

http://www.chessgames.com/perl/chessgame?gid=1070893

http://www.chessgames.com/perl/chessgame?gid=1070947

http://www.chessgames.com/perl/chessgame?gid=1011316

http://www.chessgames.com/perl/chessgame?gid=1544360

http://www.chessgames.com/perl/chessgame?gid=1005735

http://www.chessgames.com/perl/chessgame?gid=1287569

http://www.chessgames.com/perl/chessgame?gid=1220545

63.6% wins, 36.4% draws, no losses on chessgames.