[Event "Clare Benedict Cup"]
[Site "Vienna AUT"]
[Date "1972.05.??"]
[EventDate "?"]
[Round "1"]
[Result "1-0"]
[White "Raymond Keene"]
[Black "Coenraad Zuidema"]
[ECO "A07"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "145"]

1. Nf3 { Notes by Raymond Keene. } Nf6 2. g3 d5 3. Bg2 c6
4. O-O Bf5 5. d3 e6 6. Nbd2 {Probably this move introduces an
overly simple plan of campaign. It would be more appropriate
in this situation to develop obliquely with 6 b3 followed by
Bb2, e2-e3, Qe2 and eventually e3-e4.} Be7 7. Qe1 h6 8. e4 Bh7
9. Qe2 O-O 10. e5 {Inaugurating a typical anti-French King's
Indian Attack formation; but with Black's queen's bishop
already outside the pawn-chain (potentially bearing down on
the queen's wing) this strategy for White is not particularly
effective, and once again b2-b3 deserved preference.}
10...Nfd7 11. Re1 c5 12. Nf1 Nc6 13. h4 Rc8 14. Bf4 Re8 {I
expected either 14...b5 or 14...Nd4, both of which are fully
playable. The text also is not at all bad. Black quietly
strengthens his position so that he will be adequately armed
against White's offensive based on Nh2-g4 and ultimately a
sacrifice on h6. Only after proper prophylactic measures have
been taken will Black turn to his queenside counter-attack.}
15. N1h2 f5 {? But this is a panic step induced by an
unnecessary fear of the knight incursion via g4, and the move
...f7-f5 certainly does not harmonise with Black's previous
strategic dispositions. Black should have played the confident
15...Bf8, after which I could see no clear continuation of the
white attack. The correct reply to Black's error was 16 h5!,
supported by a gradual opening of the g-file. Instead White
produces a move that creates obscure and superfluous
complications.} 16. c4 {!?} g5 {! Best - otherwise Black is
slowly strangled.} 17. Be3 {At this point the lights in the
playing hall were removed, for a reason best known to the
tournament authorities. I protested, but the illumination
never returned, and the remainder of the game before the first
time-control at move 40 was conducted in twilight
conditions. In view of the sudden gloom that had descended I
proposed a draw, but my opponent chose not to reply. Instead
of 17 Be3 I also examined 17 cxd5 but I felt that after
17...exd5 the exposure of White's e-pawn would weigh more
heavily than the chances made available by the weakening of
d5.} 17...d4 18. Bc1 g4 19. Nd2 {The sacrifice of a piece for
two pawns by means of 19 Bxh6 fails to inspire confidence.}
19...Ndxe5 {On 19...Ncxe5 White gains the advantage with 20
Nb3! threatening Bxh6 and Bxb7. After the move played a long
forced variation ensues.} 20. Bxc6 Nxc6 21. Qxe6+ Kg7 22. Nb3
Bf6 {On 22...Bg6 White calmly replies 23 Bf4 threatening
h4-h5, and parrying 23...Bf6 with 24 Nxc5.} 23. Nxc5 {! Of
course not 23 Qxe8? Qxe8 24 Rxe8 Rxe8 25 Nxc5 b6 26 Nb3 Nb4
and Black wins.} 23...Ne5 {If 23...Bg6 then 24 Qxe8 really is
possible.} 24. Rxe5 {! If Black had been expecting easy play
in a vastly favourable ending after 23 Qxe8? then he must have
received a serious shock from this sudden whirlpool of
complications.} 24...Bxe5 {24...Rxc5 is no good: 25 Qxe8 Rxe5
26 Qxd8 Bxd8 27 Bf4 or 26...Re1+ 27 Nf1 Bxd8 28 Bxh6+ winning
at once.} 25. Qxh6+ Kg8 26. Bg5 {? A tempting move to make,
especially when short of time, but it is nevertheless an
error. Correct was 26 b4! intending to retreat the queen to d2
and follow up with Nb3, Bb2 and a siege of the d4-pawn. With
two pawns for the exchange, pressure against d4, and Black's
kingside curiously paralysed, White would have a fine
position.} 26...Qc7 27. b4 {27 Ne6 was originally planned, but
I observed in time that it loses to 27...Qf7 28 Nf4 Rc6 29 Qh5
Bg6! 30 Nxg6 Rxg6 and the white queen has no means of
escape. Now Black should play 27...Qf7 (or maybe 27...b6 and
then ...Qf7) to which White's best reply is full-scale retreat
with Bc1 and Qd2 (necessary to salvage the queen), reverting
to the plan outlined in the note to 26 Bg5? But in this case
White would be lacking several tempi, which could only be to
Black's advantage. Instead of this Black is lured into a false
path by the possibility of a quick victory following the
apparently annihilating blow ...Bxg3.} 27...Bxg3 {? For if 28
fxg3 Qxg3+ and ...Re2 and White is ignominiously
mated. Paradoxically, though, this stroke is a severe mistake,
since it permits White a vital tempo to resuscitate his stray
knight on h2 and it also frees the significant square g3 for
this piece.} 28. Nf1 Be5 29. Bf6 Bf4 30. Bg5 Be5 31. Bf6 Bf4
32. Bg5 Bxg5 {? After this White is probably winning. The
prudent course was 32...Be5=. In the resultant ending the
advantage of the exchange is useless in view of the helpless
nature of the black bishop and the superlative power of the
white knight when it reaches f4. By refusing to admit that he
has no right to claim victory from this bitter struggle, Black
must soon acknowledge that he has nothing left but losing
chances.} 33. Qxg5+ Qg7 34. Qxg7+ Kxg7 35. Nxb7 Rb8 36. Nd6
Red8 37. c5 Rxb4 {White's task would be more arduous after
37...f4! 38 a3 a5 39 bxa5 Rxd6 40 cxd6 Rd8 and despite an
advantage of three pawns it would be no simple problem to
convert the material plus into a full point. Black still fails
to realise that he should be defending.} 38. Ng3 Kf6 {This
loses by force, but it is hard to suggest any worthwhile
alternative. For example 38...Rdb8 loses to 39 c6 Rb1+ 40 Rxb1
Rxb1+ 41 Kg2 Rc1 42 c7 and the pawn is untouchable and next
move it queens. Meanwhile, White threatens Re1 and Nh5-f4 with
an unshakeable bind. The text does at least possess the virtue
of freeing Black's king to halt the advance of the c-pawn.}
39. Nh5+ Ke6 {a) 39...Ke7 40 Re1+ Kf8 41 Nf4 Rdb8 42 Ne6+ Kg8
43 c6+-; b) 39...Kg6 40 Nf4+ and wherever the king goes a
knight check wins a rook.} 40. Nf4+ Kd7 41. Nd5 {The sealed
move at the close of the first session. Black's best now is
41...Rb2 42 Nf6+ Kc6 43 Nxh7 Kxc5 44 Nxf5 Kb4 45 Rc1 Rxa2 but
with 46 Rc4+ and Ng5 White must win. The plan of resistance
chosen by Black allows White to consolidate and preserve his
c-pawn, when only minor technical difficulties remain.}
41...Ra4 42. Nf6+ Kc6 43. Nxh7 Rh8 44. Ng5 Rxh4 45. Rc1 g3
46. fxg3 Rg4 47. Nf3 Rxg3+ 48. Kf2 f4 49. Rc2 Rg8 50. Nf5 Rd8
51. Ne7+ Kd7 52. Ng6 Kc6 53. Nxf4 Re8 54. Ne2 Rf8 55. Kg3 Rg8+
56. Kf2 Rf8 57. Nc1 Kd5 58. Nb3 Rf6 59. Ke2 Rfa6 {The third
session. Black finds the most active course but he quite
simply lacks the material resources for effective
resistance. All the problems in the position had been solved
in adjournment analysis prior to resumption.} 60. Nfxd4 Rxa2
61. Kd2 Rxc2+ 62. Nxc2 Ra4 63. Kc3 Rh4 64. Nb4+ Ke6 65. d4
Rh3+ 66. Kc4 Rh4 67. Kb5 Kd7 68. d5 Rg4 69. Na5 Rd4 70. Nac6
a6+ 71. Kxa6 Rd1 {Of course if Black could give his rook for
the two pawns it would be a draw, but it's not possible; the
capture 71...Rxd5 fails to 72 Nb8+.} 72. Kb5 Kc7 73. Ne5 1-0