Not all of the problems of casual games - like today’s - are that they open to the door to claims of composition rather than genuine encounter. I’ve never seen anybody suggesting that Anderssen - Dufresne never happened. I have seen three different endings for what Steinitz dubbed “The Evergreen”, though.
I’m not sure why. Possibly because Anderssen announced mate in four at the crucial moment, rather than actually delivered it on the board.
As I’ve no idea which, if any of the mates, actually happened, I’ll give the version that I first saw here as the ‘game’ and the other two possible endings (mates) will crop up as BONUS QUESTIONS.
However Anderssen actually dispatched his victim, the “Call an ambulance … but not for me” trap into which Dufresne falls - even though Black had viable alternatives - makes this game essential viewing, I’d say.
Anderssen - Dufresne,
Berlin 1852
1 e4 e5
2 Nf3 Nc6
3 Bc4 Bc5
4 b4 Bxb4
5 c3 Ba5
6 d4 exd4
7 0-0 d3
8 Qb3 Qf6
9 e5 Qg6
10 Re1 Nge7
11 Ba3 b5
12 Qxb5 Rb8
13 Qa4 Bb6
14 Nbd2 Bb7
15 Ne4 Qf5
16 Bxd3 Qh5
17 Nf6+ gxf6
18 exf6 Rg8
19 Rad1 Qxf3
20 Rxe7+ Nxe7
White has a forced mate in four from here.
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21 Qxd7+ Kxd7
22 Bf5+ Ke8
23 Bd7+ Kd8
24 Be7 checkmate
BONUS QUESTIONS
BQ1: How does White finish off after 23 … Kf8 instead of moving to d8?
BQ2: How does White finish after 22 … Kc6 instead of retreating to e8?
BQ3: 20 … Nxe7 leads to a forced mate. Find how White wins after Black’s other tries.