The Stockfish chess engine won the last season of the TCEC, but hasn't been dominant thus far in season 7. This, however, is a very impressive game, with a long-term rook sacrifice and some other spectacular moves like 37.Kh2 and 41.Rf2. Although the win was Stockfish's, I think the triumph is more generally one for computer chess. I ran the game to see if Komodo and Houdini would find and favorably evaluate the rook sac, and they did, and then I went for a real test: Fritz 11 running on one core. Even it was fine with giving up the rook, and while it wasn't as excited about the sac as the stronger engines were - running on more cores - it certainly evaluated White's compensation as at least sufficient.
HT: Jeffrey Hall