Rotlewi vs Rubinstein, 1907

If 30 Qxb2 Rd1#.
If 30 Qc2 Qxc2 31 Rxc2 Rd1#.
If 30 Qd3 Qa1+ 31 Qf1 Qxc3 wins a Rook.
If 30 Qe1 Qxc3 wins a Rook (31. Qxc3 Rd1+ 32. Qe1 Rxe1#).

If 30 Rb3 Qxe2 wins a Queen.
If 30 Rc2 Qb1+ 31 Qf1 Qxc2 wins a Rook.
If 30 Rd3 Qb1+ 31 Qf1 Qxd3 wins a Rook.
If 30 Rc8 Qb1+ 31 Qf1 Qxf1+ 32 Kxf1 Rxc8 wins a Rook.

"Bernstein tried none of these lines. He resigned, as playing even one more move would have been an anticlimax." (Chernev). Kudos to Bernstein for artistic appreciation.

In his book <My Chess Career> Capa annotates both games. He does not make much of the Moscow game. Says that he lured Dr. Bernstein into a fatal trap, and, while giving 29...Qb2 an exclamation mark, makes no further comment. On the contrary, the annotations to the St. Petersburg game are lavish. He carefully comments the opening and profusely on the attack. Among other things he says: "I believe that this is one of the longest combinations on record, and that if the number of pieces involved, its many aspects and complications are all considered, it will be difficult to find one to match it." And ends saying: "I beg to be forgiven if I dwell too long on this game, but it appeals as much to my artistic sense as it complies the logical and analytical requirements which I deem essential in a masterpiece."

Fine attack - Capablanca vs O Bernstein, 1914 - see discussions above!

Brilliant defence - Capablanca vs Marshall, 1918 (the Marshall Gambit game), or maybe Marshall vs Capablanca, 1909 from their first match in 1909

Artistic impression - this game, still!

I don't think that is a reasonable supposition. Marshall quotes Capablanca as saying, "I think my most finished and artistic game was the one I played against Dr Bernstein at Moscow on 4 February 1914." This quote almost surely must have come from correspondence, not an oral statement - presumably Capablanca would not have remembered the date off the top of his head. The other Bernstein game was played at St. Petersburg, not Moscow, and of course on a different date.

It is also significant that Winter and Chernev both quote Marshall's statement without questioning it. Winter is the author of a biography of Capablanca and another book on chess champions, and a chess historian known for his punctiliousness. Chernev knew and revered Capablanca, had studied his games, wrote a book about his endgames, and considered him the greatest player of all time. I find it hard to believe that (a) Marshall would have misquoted Capablanca, making up a date and place that Capablanca had not said, (b) this error would not have come to light at some point in the 14 years between the publication of Marshall's book and Capablanca's death, (c) Chernev, if he had any doubts, would not have asked Capablanca whether Marshall's statement was accurate, and (d) Winter and Chernev, both of them authorities on Capablanca, would quote Marshall without suggesting that he was in error if they had any doubts about the veracity of the quote.

<FSR> If Capa had written the phrase to Marshall instead of orally expressing it, it makes no difference. When Marshall reported Capa's phrase, he, helpfully, added what he thought would be welcomed information to the reader. As to why nobody cleared up the point, well, there was no point to clear up. It simply never came up because Capa did not read Marshall's book. If somebody said, "Capa, so you think your best game is the one against Bernstein?", he would have answered "Yes". And if they had also used the date he would have probably answered Yes just the same. Who remembers the dates of his games?