KEG: A wild but deeply flawed game. Didier's closing combination after 22. Be4 is indeed pretty, but the flaw in Black's combination was revealed on this site over a year ago by dernier loup de T: 22. Nd2 would have won easily.
Didier declined Rosen's Evans Gambit. After Kasparov's game with Piket, Didier's 5...a6 (rather than Piket's 5...a5) looks very good.
But Didier's next move, 6...h6, was weak (6...d6 or 6...Nf6 were much better).
Rosen, however, threw away any edge he might have had after 6...h6 with 7. Ba3 (instead of the better 7. Nc3 )and with 8. c3 (which buried his own Knight instead of the indicated 8. b5).
But Didier soon erred with 13...Nh7 instead of the clearly better 13...Nd5).
Any edge Rosen got, however, he relinquished with his 14. Qc2 (instead of the better 14. Nxd4).
Now Didier had some chances for brilliant moves. He might have tried 15...Nh3+ (although his 15...Re8 may have been somewhat better). And 16...Nh3+ would have brought him equality and would have been better than his actual 16...BxN.
Didier's 17...Nf3+ was pretty (also good would have been 17...Nh3+). But his 18...Qh4 was a losing blunder pure and simple. As Sherrard noted in British Chess Magazine over a century ago, Didier could have held the game with 18...Ne1!
Had Rosen played 22. Nd2, the flaw in Didier's 18...Qh4 would have been exposed. 22. Be4 was a mistake, and threw away Rosen's win.
After 22. Be4?, Didier found the saving combination beginning with 22...RxB!!
A nice finish to a generally poorly played game.