(1) Keres,P - Dyckhoff,E [C83]
Correspondence Olympiad 1935/36, 1935



1.e4 e5 2.Nf3 Nc6 3.Bb5
The Ruy Lopez

3...a6 4.Ba4 Nf6 5.0-0 Nxe4
The open variation. Black wins a pawn temporarily. White will seek counterplay in the center and down the open e-file.

6.d4 b5 7.Bb3 d5
Securing the position of the Ne4. exd4 is far too dangerous in face of the pressure on the e-file.

8.dxe5 Be6
A common position in the Ruy

9.c3
Securing d4 and preparing the Bc2 retreat

9...Be7 10.Be3 0-0 11.Nbd2
TRading off black's advanced Ne4 post

11...Nxd2 12.Qxd2 Qd7 13.Qd3 Na5 14.Bc2
IN a correspondence game between grandmasters, mate will not occur quickly. White simply wants to impel the weakening of the kingside pawns.

14...g6
The f6 and h6 squares are now weak

15.Bh6
Moving immediately into the vaccuum

15...Bf5 16.Qe2 Rfe8 17.Nd4
Forcing the exchange of the bishops and supporting f4-f5

17...Bxc2 18.Nxc2
Avoiding Qxc2 c5

18...Bd6 19.f4
White securesa the center. The idea is f5.

19...f6
Identifying the e5-weakness, fixing and attacking it with his pieces and finally a pawn. Black will win the e-pawn but at the cost of further kingside weakening.

20.Qd3
Out of the pin, supporting f4-f5

20...fxe5 21.f5!
[21.Qxd5+ Qe6 ]

21...Bc5+ 22.Kh1 e4 23.Qg3
threat fxg6. White must play actively to avoid Nc4-e5

23...Bd6 24.Qg5
maintaining the threat.

24...Re5
active defense, pinning the f-pawn

25.Ne3
idea Ng4-f6+

25...Qf7 26.Qh4
Renewing the fxg6 threat.

26...Nc4!
active defense!

27.fxg6 Qxg6 28.Rf6
Diagram

28...Rh5
allowing Rxg6 CHECK!

29.Rxg6+ hxg6 30.Qf6
And black emeres with Rxh2 and Rxh6

30...Rxh2+ 31.Kg1 Rxh6 32.Qg5 Kh7
Black has a R+B+2 pawns and an active game for the queen

33.Ng4
Diagram

33...Bc5+ 34.Kf1 Rh1+ 35.Ke2 Rxa1
Winning the Ra1 but ceding the inititative back to white

36.Qh6+ Kg8 37.Qxg6+ Kh8 38.Qf6+ Kh7 39.Qh6+
White can force a perpetual but tries for more.

39...Kg8 40.Qg5+ Kh8 41.Qxd5 Rf8 42.Qh5+ Kg7 43.Qxc5 Rff1
threat Rae1#

44.Qxc7+ Kg6 45.Qg3 Rae1+ 46.Qxe1 Rxe1+ 47.Kxe1 Nxb2
Material equality has been restored!

48.Kd2 Kf5 49.Ne3+ Kf4 50.Nd5+ Ke5 51.Nc7 Nc4+ 52.Ke2 Na3 53.Nxa6 Nb1 54.Nb4 Nxc3+ 55.Kd2 Nb1+ 1/2-1/2