Below is a game I more than once have used in chess classes as it's rather thematic, short and finishes with a nice tactical blow.
Jan Plachetka - Lothar Zinn, Decin, 1974
1.Nf3 c5 2.b3 Nc6 3.Bb2 Nf6 4.e3 d5 5.Bb5 e6
It's a kind of reversed Nimzo Indian and White has got a good grip on the a1-h8 diagonal, including the central squares d4 and e5.
6.Ne5 Qc7 7.0–0 Bd6 8.Bxc6+ bxc6 9.f4 0–0
Now also Black's king is close to that long diagonal.
10.Rf3 Nd7
11.Rh3! g6? (Dia)
This now is a famous mistake. I am not sure how the position should be evaluated after 11...f6. There are at least two practical tests:
a) 12.Qh5?! doesn't quite convince: 12...fxe5 13.Qxh7+ Kf7 14.Rg3 Ke8 15.Rxg7 Ba6 16.Na3 exf4 17.exf4 Kd8 18.Bc3 Kc8 –+ Rogers-Bacrot, Cap d'Agde rapid 1998.
b) White probably should content himself with 12.Nxd7 Bxd7 13.Qh5 h6 14.Qg4 Kh8 15.Nc3 Rae8 16.Ne2 Re7 17.Rf1 e5 18.f5 and White had nice attacking prospects in Baeumer-Ripperger, Ludweiler 1994.
12.Qh5!!
A very visual move.
12...Nf6
Obviously not 12...gxh5? 13.Rg3+ Kh8 14.Nxf7 mate.
13.Ng4!
This is slightly more exact than 13.Qh6 when Black can prolong the struggle with 13...d4! 14.exd4 (14.Ng4 Nh5 15.Rxh5 f5! 16.Ne5 Bxe5 17.fxe5 gxh5 18.exd4 cxd4 19.Bxd4 Qg7 +=) 14...Re8 15.Ng4 Nxg4 16.Qxh7+ Kf8 17.Qh8+ Ke7 18.Qh4+ Kd7 19.Qxg4 +-.
13...gxh5 14.Nxf6+ Kh8
Or 14...Kg7 15.Ne8+ Kh6 16.Bg7+ Kg6 17.Rg3+ Kf5 18.Rg5+ Ke4 19.Nc3.
15.Rxh5 h6 16.Nxd5+ Kh7 17.Nxc7 Bxc7 18.Rxc5 1–0
Interestingly there is a quite amusing tag to the game. In John Pajak-David Norwood,
His 12th (and last) move is sufficient reason for Pajak to get an honorable mention on a 1st of April's chess column. But that's not all. According to MegaBase 2008 the game was actually played on the first of April! When I noticed this, my first reaction was to check whether John Pajak was a real chess player or if the entire game was an invention by Norwood. And he indeed is - at the time when the game was played Pajak was unrated but he soon gained a respectable rating of 2310. There also obviously was a tournament in Toronto 1985 with, among others, GMs Joel Benjamin and Kevin Spraggett. The date, however, appears somewhat questionable as according to MegaBase all games were played on April 1st.
I will leave my research there - this game may well have been played on April 1st - and in my mind that's when it should have been played!