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Amsterdam IBM 1979
Compiled by suenteus po 147
--*--

The grandmaster section of the nineteenth annual IBM international chess tournament was a category XII event held at Amsterdam, the Netherlands in 1979. Fourteen grandmasters and top masters were invited to participate in the round robin event, including (in order of ELO): Vlastimil Hort (2600), Gyula Sax (2590), Ulf Andersson (2560), Jan Smejkal (2560), Michael Stean (2540), Robert Byrne (2535), Anatoly Lein (2535), Gennady Sosonko (2535), Dragutin Sahovic (2520), Eugenio Torre (2520), Ivan Farago (2510), Hans Ree (2480), Jan Hein Donner (2465), and Gert Ligterink (2440). Two games decided by forfeit are missing from the database and therefore omitted from this collection. Hort, finishing undefeated with +5 tied with Sax at the final. The final standings and crosstable are as follows:

01 Hort 9/13 * ½ 1 ½ ½ ½ 1 1 1 ½ ½ ½ ½ 1

02 Sax 9/13 ½ * ½ 1 ½ ½ 0 1 1 1 ½ ½ 1 1

03 Andersson 8.5/13 0 ½ * ½ ½ 1 ½ 1 1 1 ½ 1 ½ ½

04 Smejkal 8.5/13 ½ 0 ½ * ½ ½ 1 ½ 1 1 1 0 1 1

05 Sosonko 7/13 ½ ½ ½ ½ * ½ ½ 0 ½ ½ ½ 1 ½ 1

06 Byrne 7/13 ½ ½ 0 ½ ½ * ½ ½ ½ ½ ½ 1 ½ 1

07 Torre 7/13 0 1 ½ 0 ½ ½ * ½ ½ ½ 1 1 ½ ½

08 Ree 6/13 0 0 0 ½ 1 ½ ½ * ½ 1 ½ ½ 1 0

09 Lein 6/13 0 0 0 0 ½ ½ ½ ½ * 1 ½ ½ 1 1

10 Donner 5/13 ½ 0 0 0 ½ ½ ½ 0 0 * 1 1 ½ ½

11 Ligterink 4.5/13 ½ ½ ½ 0 ½ ½ 0 ½ ½ 0 * ½ ½ 0

12 Farago 4.5/13 ½ ½ 0 1 0 0 0 ½ ½ 0 ½ * ½ ½

13 Stean 4.5/13 ½ 0 ½ 0 ½ ½ ½ 0 0 ½ ½ ½ * ½

14 Sahovic 4.5/13 0 0 ½ 0 0 0 ½ 1 0 ½ 1 ½ ½ *

Round One, Game #1
R Byrne vs E Torre, 1979 
(B68) Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 9...Be7, 21 moves, 1/2-1/2

Round One, Game #2
J H Donner vs Sahovic, 1979
(A50) Queen's Pawn Game, 25 moves, 1/2-1/2

Round One, Game #3
I Farago vs G Ligterink, 1979
(E20) Nimzo-Indian, 95 moves, 1/2-1/2

Round One, Game #4
Hort vs M Stean, 1979
(A02) Bird's Opening, 25 moves, 1/2-1/2

Round One, Game #5
Sax vs A Lein, 1979
(B10) Caro-Kann, 42 moves, 1-0

Round One, Game #6
Smejkal vs Andersson, 1979
(A30) English, Symmetrical, 48 moves, 1/2-1/2

Round One, Game #7
Sosonko vs Ree, 1979
(D98) Grunfeld, Russian, 46 moves, 0-1

Round Two, Game #8
Andersson vs Hort, 1979
(B08) Pirc, Classical, 37 moves, 0-1

Round Two, Game #9
A Lein vs I Farago, 1979
(A14) English, 18 moves, 1/2-1/2

Round Two, Game #10
Ree vs G Ligterink, 1979
(E39) Nimzo-Indian, Classical, Pirc Variation, 26 moves, 1/2-1/2

Round Two, Game #11
Sahovic vs Smejkal, 1979
(B42) Sicilian, Kan, 26 moves, 0-1

Round Two, Game #12
Sosonko vs R Byrne, 1979
(D43) Queen's Gambit Declined Semi-Slav, 26 moves, 1/2-1/2

Round Two, Game #13
M Stean vs Sax, 1979 
(A27) English, Three Knights System, 21 moves, 0-1

Round Two, Game #14
E Torre vs J H Donner, 1979
(D18) Queen's Gambit Declined Slav, Dutch, 17 moves, 1/2-1/2

Round Three, Game #15
R Byrne vs Ree, 1979
(B84) Sicilian, Scheveningen, 28 moves, 1/2-1/2

Round Three, Game #16
J H Donner vs Sosonko, 1979
(E41) Nimzo-Indian, 17 moves, 1/2-1/2

Round Three, Game #17
I Farago vs M Stean, 1979
(E55) Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation, 22 moves, 1/2-1/2

Round Three, Game #18
Hort vs Sahovic, 1979
(A22) English, 38 moves, 1-0

Round Three, Game #19
G Ligterink vs A Lein, 1979
(B15) Caro-Kann, 40 moves, 1/2-1/2

Round Three, Game #20
Sax vs Andersson, 1979
(B15) Caro-Kann, 13 moves, 1/2-1/2

Round Three, Game #21
Smejkal vs E Torre, 1979
(E62) King's Indian, Fianchetto, 41 moves, 1-0

Round Four, Game #22
Andersson vs I Farago, 1979 
(E08) Catalan, Closed, 56 moves, 1-0

Round Four, Game #23
R Byrne vs J H Donner, 1979
(B09) Pirc, Austrian Attack, 22 moves, 1/2-1/2

Round Four, Game #24
Ree vs A Lein, 1979
(A29) English, Four Knights, Kingside Fianchetto, 21 moves, 1/2-1/2

Round Four, Game #25
Sahovic vs Sax, 1979
(A49) King's Indian, Fianchetto without c4, 27 moves, 0-1

Round Four, Game #26
Sosonko vs Smejkal, 1979
(D98) Grunfeld, Russian, 17 moves, 1/2-1/2

Round Four, Game #27
M Stean vs G Ligterink, 1979
(A30) English, Symmetrical, 17 moves, 1/2-1/2

Round Four, Game #28
E Torre vs Hort, 1979
(B06) Robatsch, 26 moves, 0-1

Round Five, Game #29
J H Donner vs Ree, 1979
(A64) Benoni, Fianchetto, 11...Re8, 33 moves, 0-1

Round Five, Game #30
I Farago vs Sahovic, 1979
(A40) Queen's Pawn Game, 38 moves, 1/2-1/2

Round Five, Game #31
Hort vs Sosonko, 1979
(A46) Queen's Pawn Game, 24 moves, 1/2-1/2

Round Five, Game #32
A Lein vs M Stean, 1979
(E15) Queen's Indian, 25 moves, 1-0

Round Five, Game #33
G Ligterink vs Andersson, 1979
(B82) Sicilian, Scheveningen, 52 moves, 1/2-1/2

Round Five, Game #34
Sax vs E Torre, 1979
(A07) King's Indian Attack, 52 moves, 0-1

Round Five, Game #35
Smejkal vs R Byrne, 1979
(E06) Catalan, Closed, 5.Nf3, 24 moves, 1/2-1/2

Round Six, Game #36
Andersson vs A Lein, 1979
(A26) English, 40 moves, 1-0

Round Six, Game #37
R Byrne vs Hort, 1979
(B84) Sicilian, Scheveningen, 22 moves, 1/2-1/2

Round Six, Game #39
Ree vs M Stean, 1979
(E32) Nimzo-Indian, Classical, 23 moves, 1-0

Round Six, Game #40
Sahovic vs G Ligterink, 1979
(A46) Queen's Pawn Game, 56 moves, 1-0

Round Six, Game #41
Sosonko vs Sax, 1979
(D97) Grunfeld, Russian, 14 moves, 1/2-1/2

Round Six, Game #42
E Torre vs I Farago, 1979
(C07) French, Tarrasch, 44 moves, 1-0

Round Seven, Game #43
I Farago vs Sosonko, 1979
(E41) Nimzo-Indian, 49 moves, 0-1

Round Seven, Game #44
Hort vs J H Donner, 1979
(C65) Ruy Lopez, Berlin Defense, 47 moves, 1/2-1/2

Round Seven, Game #45
A Lein vs Sahovic, 1979
(A77) Benoni, Classical, 9...Re8, 10.Nd2, 57 moves, 1-0

Round Seven, Game #46
G Ligterink vs E Torre, 1979
(B09) Pirc, Austrian Attack, 40 moves, 0-1

Round Seven, Game #47
Sax vs R Byrne, 1979
(C45) Scotch Game, 35 moves, 1/2-1/2

Round Seven, Game #48
Smejkal vs Ree, 1979
(A21) English, 18 moves, 1/2-1/2

Round Seven, Game #49
M Stean vs Andersson, 1979
(A34) English, Symmetrical, 22 moves, 1/2-1/2

Round Eight, Game #50
R Byrne vs I Farago, 1979
(C19) French, Winawer, Advance, 51 moves, 1-0

Round Eight, Game #51
J H Donner vs Sax, 1979
(E60) King's Indian Defense, 25 moves, 0-1

Round Eight, Game #52
Ree vs Andersson, 1979 
(E32) Nimzo-Indian, Classical, 49 moves, 0-1

Round Eight, Game #53
Sahovic vs M Stean, 1979
(D90) Grunfeld, 12 moves, 1/2-1/2

Round Eight, Game #54
Smejkal vs Hort, 1979
(A29) English, Four Knights, Kingside Fianchetto, 14 moves, 1/2-1/2

Round Eight, Game #55
Sosonko vs G Ligterink, 1979
(E97) King's Indian, 18 moves, 1/2-1/2

Round Eight, Game #56
E Torre vs A Lein, 1979
(B98) Sicilian, Najdorf, 24 moves, 1/2-1/2

Round Nine, Game #57
Andersson vs Sahovic, 1979
(A25) English, 34 moves, 1/2-1/2

Round Nine, Game #58
I Farago vs J H Donner, 1979
(D10) Queen's Gambit Declined Slav, 38 moves, 0-1

Round Nine, Game #59
Hort vs Ree, 1979
(B83) Sicilian, 42 moves, 1-0

Round Nine, Game #60
A Lein vs Sosonko, 1979
(A36) English, 29 moves, 1/2-1/2

Round Nine, Game #61
G Ligterink vs R Byrne, 1979
(C77) Ruy Lopez, 31 moves, 1/2-1/2

Round Nine, Game #62
Sax vs Smejkal, 1979 
(C77) Ruy Lopez, 37 moves, 1-0

Round Nine, Game #63
M Stean vs E Torre, 1979
(D85) Grunfeld, 30 moves, 1/2-1/2

Round Ten, Game #64
R Byrne vs A Lein, 1979
(C99) Ruy Lopez, Closed, Chigorin, 12...cd, 23 moves, 1/2-1/2

Round Ten, Game #65
J H Donner vs G Ligterink, 1979
(A40) Queen's Pawn Game, 39 moves, 1-0

Round Ten, Game #66
Hort vs Sax, 1979
(B23) Sicilian, Closed, 15 moves, 1/2-1/2

Round Ten, Game #67
Ree vs Sahovic, 1979
(D02) Queen's Pawn Game, 37 moves, 0-1

Round Ten, Game #68
Smejkal vs I Farago, 1979
(A12) English with b3, 88 moves, 0-1

Round Ten, Game #69
Sosonko vs M Stean, 1979
(E06) Catalan, Closed, 5.Nf3, 20 moves, 1/2-1/2

Round Ten, Game #70
E Torre vs Andersson, 1979
(B83) Sicilian, 17 moves, 1/2-1/2

Round Eleven, Game #71
Andersson vs Sosonko, 1979
(A30) English, Symmetrical, 20 moves, 1/2-1/2

Round Eleven, Game #72
I Farago vs Hort, 1979
(E12) Queen's Indian, 38 moves, 1/2-1/2

Round Eleven, Game #73
A Lein vs J H Donner, 1979
(B07) Pirc, 45 moves, 1-0

Round Eleven, Game #74
G Ligterink vs Smejkal, 1979
(C91) Ruy Lopez, Closed, 35 moves, 0-1

Round Eleven, Game #75
Sahovic vs E Torre, 1979
(D91) Grunfeld, 5.Bg5, 40 moves, 1/2-1/2

Round Eleven, Game #76
Sax vs Ree, 1979
(C02) French, Advance, 43 moves, 1-0

Round Eleven, Game #77
M Stean vs R Byrne, 1979
(A14) English, 25 moves, 1/2-1/2

Round Twelve, Game #78
R Byrne vs Andersson, 1979 
(B42) Sicilian, Kan, 41 moves, 0-1

Round Twelve, Game #79
J H Donner vs M Stean, 1979
(E45) Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation, 43 moves, 1/2-1/2

Round Twelve, Game #80
Hort vs G Ligterink, 1979
(E75) King's Indian, Averbakh, Main line, 17 moves, 1/2-1/2

Round Twelve, Game #81
Ree vs E Torre, 1979
(A56) Benoni Defense, 20 moves, 1/2-1/2

Round Twelve, Game #82
Sax vs I Farago, 1979
(C00) French Defense, 13 moves, 1/2-1/2

Round Twelve, Game #83
Smejkal vs A Lein, 1979
(E06) Catalan, Closed, 5.Nf3, 86 moves, 1-0

Round Twelve, Game #84
Sosonko vs Sahovic, 1979
(A40) Queen's Pawn Game, 60 moves, 1-0

Round Thirteen, Game #85
Andersson vs J H Donner, 1979 
(A11) English, Caro-Kann Defensive System, 39 moves, 1-0

Round Thirteen, Game #86
I Farago vs Ree, 1979
(A15) English, 13 moves, 1/2-1/2

Round Thirteen, Game #87
A Lein vs Hort, 1979
(E14) Queen's Indian, 39 moves, 0-1

Round Thirteen, Game #88
G Ligterink vs Sax, 1979
(B84) Sicilian, Scheveningen, 18 moves, 1/2-1/2

Round Thirteen, Game #90
M Stean vs Smejkal, 1979
(A10) English, 57 moves, 0-1

Round Thirteen, Game #91
E Torre vs Sosonko, 1979
(E17) Queen's Indian, 12 moves, 1/2-1/2

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