This was a World Championship Match between the then World Champion Emanuel Lasker and the challenger Siegbert Tarrasch in which Siegbert defends well and then counter attacks to a nice finish. The winning move being a beautifull pawn move, and making three brilliant pawn moves in the game.
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 Most of the best players in the world have at some time got into this position as Black or White. It is the Ruy Lopez Opening.
6.Re1 b5 7.Bb3 d6 8.c3 Na5 this line used to be played because Black feared d4 by White here so he aims to get in c5 or atleast swap off the strong b3 Bishop, but a better premptive reply to 9.d4 is 8...Bg4 so Black stands ok there, and Na5 went out of fashion and is rarely seen at the highest level.
9.Bc2 c5 10.d4 White must free his position with this move else face a poor game with the Queenside assault by Black.
10...Qc7 11.Nbd2 Nc6 12.h3 0-0 13.Nf1 cxd4 14.cxd4 Nxd4 15.Nxd4 exd4 16.Ng3 [16.Qxd4?? Qxc2-+ and White should resign if he retakes the pawn immediately.]
16...Nd7 17.Bb3 Qb6 18.Nf5 Bf6 19.Bf4 Ne5 20.Bd5 Ra7 21.Qb3 [21.Nxd4?! Nc4 22.Nc6 Rc7 23.b3 Bxa1 24.Qxa1 Rxc6 25.Bxc6 Qxc6 26.bxc4 bxc4=/+ ]
21...Rc7 22.g4 g6 23.Nh6+ Kg7 24.g5 Bd8 25.Qg3 f6!! Emanuel has overpushed his attack and this move is an inspired start of a counter attack aiming at the f2 square.
26.Nf5+ Kh8! [26...gxf5 27.gxf6+ Kh8 (27...Kxf6 28.Qg5# ) 28.Bh6 Rff7 (28...Rxf6 29.Qg8# ) 29.Bxf7 Rxf7 30.Bg7+ Kg8 31.Bh6+ Kh8= with a draw by repetition of the moves.]
27.Nh4 to defend the the weak f3 square from Siegberts strong Knight hoping to fork a Queen on g5 or a Rook on e1 with the King from the f3 square.
27...fxg5 28.Bxg5 Bxg5 29.Qxg5 now you see the importance of Whites 27th move.
29...d3!! with this lowly pawn move the tables have completely turned and Emanuel must defend. Notice how f2 is now undefendable.
30.Kh1 [30.Qg3 Rc2 31.Rf1 Qd4 32.Rab1 d2 33.Bb3 Rxb2 34.Rxb2 Qxb2 35.Qg5 Nc4 36.Bxc4 bxc4 37.Rd1 Bxh3-+ (37...c3?? 38.Nxg6+ hxg6 39.Qh6+ Kg8 40.Qxg6+ Kh8= another posible draw by repetition.) ]
30...Rc2 31.Re3 Rfxf2 32.Ng2 d2 [32...Rxg2?? 33.Qf6# ]
33.Rg1 Rc1 34.Qe7 Rxg1+ 35.Kxg1 d1Q+ 36.Kxf2 Qf3+! 37.Ke1?! [37.Kg1 Bxh3 38.Qe8+ Kg7 39.Qe7+ Nf7 40.Qxf7+ Qxf7 41.Bxf7 Kxf7 ]
37...Qa5+? [37...Nd3+!! 38.Kd2 Qa5+ 39.b4 Qxb4+ 40.Kc2 Qxg2+ 41.Kd1 Qbd2# ]
38.Rc3 Bxh3 39.Qxd6 Qaxc3+ 40.bxc3 Qxc3+ 41.Ke2 Qc2+ 42.Ke3 Qd3+ 43.Kf4 g5+!! a fabulous move.
44.Kxg5 [44.Kxe5 Qc3# ]
44...Nf7+ notice how Siegberts pieces were protecting the key squares in that endgame. the Bishop was protecting e6 or Emanuels Queen would have gone there to attack the king also Siegberts Queen was defending the d8 square from a posible repition of moves with Emanuels Queen constantly checking along the d8 to h4 diagonal and finally the Rook along the f file and then the extra Queen on f3 were defending the f8, f7, f6 squares -Qf6 and Qf8 would have been winning moves if posible for Emanuel. So even with the extra Queen it was easy to slip up there for Siegbert. Siegbert ended up losing the match quite convincingly though, even though he won this game. 0-1