Phony Benoni: It appears this game is not the 17th of this match."American Chess Bulletin", May / June 1918, p. 139, gives the following score for the seventeenth game of the match:
[Event "Jaffe - Janowski 1917/18"]
[Site "New York, NY USA"]
[Date "1918.01.01"]
[EventDate "1917.11.11"]
[Round "17"]
[Result "0-1"]
[White "Charles Jaffe"]
[Black "David Janowski"]
[ECO "C49"]
[WhiteElo "?"]
[BlackElo "?"]
[Source "American Chess Bulletin, May / June 1918, p. 129."]
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.0-0 0-0 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7 9.Re1 Nd8 10.d4 Ne6 11.Bc1 Rd8 12.Bd3 Nf8 13.c4 Ng6 14.c3 c5 15.Rb1 b6 16.a4 Nh5 17.Bf1 Nhf4 18.g3 Nh3+ 19.Bxh3 Bxh3 20.Ng5 Bd7 21.f4 h6 22.Nf3 exf4 23.Bxf4 Bg4 24.Qd3 Qf6 25.Rf1 Nxf4 26.gxf4 Bh3 27.Rf2 Qxf4 28.Nd2 Qh4 29.Rf3 Bd7 30.Rbf1 Rf8 31.a5 Rae8 32.axb6 axb6 33.dxc5 dxc5 34.Rg3 Bc6 35.Qe3 f5 36.Rf4 Qh5 37.Rh3 Qd1+ 38.Rf1 Qg4+ 39.Rg3 f4 40.Qf3 Qxf3 41.Rgxf3 g5 42.Rb1 Bxe4 43.Nxe4 Rxe4 44.Rxb6 Kg7 45.Rd3 Rf6 46.Rxf6 Kxf6 47.Kf2 g4 48.Rd6+ Re6 49.Rd8 h5 50.Rc8 Re5 51.Rd8 Kg5 52.Rd7 f3 53.Kf1 Re2 54.Rd5+ Kh4 55.Kg1 Rg2+ 56.Kh1 Rc2 57.Kg1 Rxc3 58.Rxc5 Rc1+ 59.Kf2 Rh1 60.Rf5 Rxh2+ 61.Ke3 Kg3 62.c5 h4 63.Kd3 Rh1 64.Kd2 f2 65.Rxf2 Kxf2 66.c6 Ra1 67.c7 Ra8 0-1
That this is the correct game is confirmed by:
1) New York Herald, January 2, 1918:
<Ninth Chess Victory for French Champion"Securing his fourth victory in succession in his match against C. Jaffe at the New York City Chess Club Yesterday, D. Janowski the French chess champion notched his ninth win in a total of seventeen games played, thereby getting within one win of the total of ten which he needs to win the match and stakes.
"Janowski had the Black side of a Double Ruy Lopez, and by a clever move at his twenty-fourth turn forced the win of a pawn. After an exchange of major forces Janowski was left with a majority of three pawns to one on the king's side of the board. Janowski has won 9, lost 4, and drawn 4.">
The description given fits the game from ACB, not the one on this page. The "Brooklyn Daily Eagle" for January 3,1918, has essentially the same description.
2) Philadelphia Inquirer, January 20, 1918 has the score of the game appearing in ACB, and describes it as the 17th game of the match.
I have not found the actual venue of the game score on this page. It is not from this or an earlier Jaffe - Janowski match. Both layers were active in New York City during the First World War, and had many occasions to play.