The latest Bundesliga season ended last weekend, with Baden-Baden winning for about the 30th time in a row. (Okay, it was only their ninth consecutive title. Other teams had better find rich benefactors if they hope to break this strangehold.) Levon Aronian was the special guest star helping push them over the edge to victory, scoring 2.5/3 over the final weekend to not only help them but himself as well as he aimed to recover from a poor finish at the Candidates.
More about that here, but I'd like to focus on Anatoly Karpov's surprise appearance. He played a couple of games, drawing with the lower-rated Felix Graf before defeating the 2664-rated Maxim Rodshtein in his second game, and with the black pieces. You can replay those games here, and I would especially draw your attention to Graf's unusual drawing combination in the first game. Most sacrifices involve captures - think of bishop sacrifices on h6 and h7, for example - but sometimes a piece is moved to an empty square. It's even rarer to have the first sac accepted only to have a second empty-square sacrifice on the next move, but that's just what Graf did. There are probably other examples of this happening, but I'm unable to recall any offhand. If you can think of some other examples, please share them with us!