1970 US Open - Boston
The 71st US Chess Open was held in Boston, Massachusetts on August 9-22, 1970. It was
held at the Parker House Hotel and directed by George Koltanowski. It was a 12 round event
with $6,000 in prize fund. Entry fee was $25. First place was $1,500. Time control was
50 moves in 2 1/2 hours. Hotel rate was $12.50. 307 players signed up, but 303 players played.
It was the first time that the US Open had more than 300 players. The event was won by
Bent Larsen with a 10.5-1.5 score. Larsen won the US Open in 1968.
He drew with Benko, Robert Byrne, and Rudy Blumenfeld and
won all his other games. 2nd place went to Pal Benko with a 10-2 score. He won $900. 3rd
place went to Robert Byrne with a 9.5-2.5 score. He won $600. 5 grandmasters played: Larsen,
Benko, R Byrne, Browne, and Kavalek.
During the tournament, the air conditioning broke. Kavalek had to go to the hospital after
the tournament due to kidney stones.
During one round, a player was paged for a phone call. On his return, his opponent asked what
was so important. He replied, "Oh, my house just burned down" and continued the game.
Weinstein Norman - Larsen Bent, Boston (US Open) 1970
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 e6 7.Be3 Be7
8.Qe2 a6 9.O-O-O Qc7 10.Bb3 b5 11.g4 Na5 12.g5 Nxb3+ 13.axb3 Nd7 14.h4
Bb7 15.f3 b4 16.Na4 Nc5 17.Qf2 Rc8 18.Kb1 Nxa4 19.bxa4 d5 20.exd5 Bxd5
21.Nf5 O-O 22.Nxe7+ Qxe7 23.b3 Rc3 24.Rh3 Rfc8 25.Rd2 Qc7 26.Rh1 Bxb3
27.Rc1 Ba2+ 0-1
Kavalek Lubomir - Larsen Bent, Boston (US Open) 1970
1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 d6 6.Be2 Nf6 7.Be3 Be7
8.O-O Bd7 9.f4 a6 10.a4 Qc7 11.Nb3 b6 12.g4 d5 13.e5 Ne4 14.Nxe4 dxe4
15.c3 Na5 16.Nxa5 bxa5 17.Qd4 Bc6 18.b4 O-O 19.b5 Bb7 20.Rfd1 axb5
21.axb5 a4 22.c4 Rfd8 23.Qb6 Rxd1+ 24.Bxd1 Qd7 25.c5 Bd8 26.Qd6 Qxb5
27.Rxa4 Ba6 28.h3 Bh4 29.Qd2 Rd8 30.Rd4 Rxd4 31.Bxd4 Qf1+ 32.Kh2 e3
33.Bxe3 Bb7 34.Bg1 h6 35.g5 g6 36.Bh5 Kh7 37.Bxg6+ Kxg6 38.c6 Qf3
39.Bf2 Bxc6 40.f5+ Kh5 41.Bxh4 Qh1+ 42.Kg3 Qg1+ 43.Kf4 hxg5+ 0-1
Larsen Bent - Browne Walter, Boston (US Open) 1970
1.Nf3 c5 2.g3 Nc6 3.Bg2 g6 4.d4 cxd4 5.Nxd4 Bg7 6.Nb3 Nf6 7.O-O O-O
8.c4 d6 9.Nc3 Be6 10.c5 d5 11.Bg5 Ne4 12.Nxe4 dxe4 13.Qc2 Qd5 14.Be3
f5 15.Rfd1 Qc4 16.Qxc4 Bxc4 17.Rd2 Rfd8 18.Rc2 Bf7 19.f3 exf3 20.Bxf3
e5 21.Bxc6 bxc6 22.Na5 Bd5 23.Rd1 Rf8 24.b4 f4 25.Bf2 Be4 26.Rcd2 f3
27.exf3 Bxf3 28.Re1 e4 29.Bd4 Rfd8 30.Nb3 Bh6 31.Be3 Bg7 32.Rxd8+ Rxd8
33.Na5 Bc3 34.Rb1 Rc8 35.a4 Kg7 36.Rb3 Bf6 37.b5 Bd1 38.Rb4 cxb5
39.axb5 Bc3 40.Bd4+ Bxd4+ 41.Rxd4 Be2 42.b6 axb6 43.cxb6 e3 44.b7 Rc1+
45.Kg2 Rb1 46.Rd8 Bf1+ 47.Kf3 e2 48.Re8 Kf7 49.Re3 g5 50.Kf2 h5 51.Nc6
1-0
Benko Pal - Kavalek Lubomir, Boston (US Open) 1970
1.Nf3 Nf6 2.c4 d6 3.b4 e5 4.Nc3 g6 5.d3 Bg7 6.Bb2 O-O 7.e3 Re8 8.Be2
c6 9.O-O d5 10.cxd5 cxd5 11.Rc1 a6 12.a4 Nc6 13.b5 Nb4 14.Qb3 a5
15.Na2 e4 16.dxe4 dxe4 17.Nd4 Nxa2 18.Qxa2 Nd7 19.Bc4 Ne5 20.Bd5 Qh4
21.Rc7 Rf8 22.Ne2 Bd7 23.Ng3 Rad8 24.Bxe5 Bxe5 25.Rxb7 Kh8 26.Qc4 f5
27.Be6 Be8 28.Bf7 Bd7 29.Qc5 Bg7 30.Bb3 f4 31.exf4 Qxf4 32.Qa7 Qd2
33.Nxe4 Qb2 34.Rxd7 Rxd7 35.Qxd7 Qxb3 36.Nc5 Qb4 37.Ne6 Rg8 38.Nxg7
Rxg7 39.Qe8+ Rg8 40.Qe5+ Rg7 41.Rc1 h6 42.h3 Kg8 43.Rc8+ Kh7 44.Qe8 g5
45.Qh8+ Kg6 46.Rc6+ 1-0
Krotki Jan - Benko Pal, Boston (US Open) 1970
1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 e6 6.Nh3 Nge7 7.O-O O-O 8.Be3
b6 9.Qd2 d5 10.Bh6 dxe4 11.Bxg7 Kxg7 12.Nxe4 Bb7 13.Rfe1 h6 14.Rad1
Qd7 15.Nf4 Rad8 16.Ne2 Nd4 17.Nxd4 cxd4 18.Qb4 Ba8 19.Nd2 Bxg2 20.Kxg2
Rc8 21.Rc1 Rc5 22.a4 Nc6 23.Qa3 Ne5 24.Kg1 Rfc8 25.Qb3 Qc6 26.Re4 Rxc2
27.Rxc2 Qxc2 28.Rxe5 Qxd2 29.Re4 Rc2 30.Rf4 Qd1+ 31.Kg2 Rxf2+ 0-1
Kavalek Lubomir - Formanek Ed, Boston (US Open) 1970
1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 Ne7 5.a3 Bxc3+ 6.bxc3 c5 7.Nf3 Nbc6
8.a4 Qa5 9.Qd2 Bd7 10.Bd3 c4 11.Be2 f6 12.Ba3 O-O-O 13.O-O Rdg8
14.Rfe1 h5 15.h4 Nf5 16.Bf1 Rh7 17.g3 Nh6 18.Bh3 Ng4 19.Bd6 Qd8 20.a5
Nxa5 21.Qc1 Nc6 22.Qa3 g5 23.Reb1 Be8 24.hxg5 fxg5 25.Nd2 Rg6 26.Bg2
b6 27.Nxc4 dxc4 28.Qa4 Rc7 29.Rxb6 axb6 30.Qa8+ Nb8 31.Qxb8+ Kd7
32.Qxb6 1-0
Dunning John - Bone Eric, Boston (US Open) 1970
1.Nf3 e6 2.c4 Nf6 3.d4 c5 4.d5 b5 5.cxb5 exd5 6.Bg5 d4 7.e3 dxe3
8.Bxf6 Qxf6 9.Qd5 Qxb2 10.Qxa8 exf2+ 11.Kd1 Qxa1 12.Bd3 Bd6 13.Qd5 Qf6
14.Ng5 Bb7 15.Qxb7 Qxg5 16.Qxa7 Qd5 0-1
Wozney Tom - Winslow Elliott, Boston (US Open) 1970
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O
8.Bc4 Nc6 9.Qd2 Bd7 10.O-O-O Qa5 11.Kb1 Ne5 12.Bb3 Rfc8 13.g4 Nc4
14.Qd3 Nxe3 15.Qxe3 Qc5 16.Qd3 Rab8 17.h4 b5 18.h5 b4 19.Nd5 Nxd5
20.Bxd5 e6 21.Bb3 a5 22.hxg6 hxg6 0-1
Koretsky P - Opalek J, Boston (US Open) 1970
1.c4 Nf6 2.Nc3 g6 3.e4 d6 4.d4 Bg7 5.f3 O-O 6.Be3 Na6 7.Qd2 c5 8.Nge2
Bd7 9.g4 cxd4 10.Nxd4 h5 11.gxh5 Nxh5 12.O-O-O Nc7 13.Bh6 Kh7 14.Bxg7
Kxg7 15.Rg1 Ne6 16.Nf5+ Kg8 17.e5 Nef4 18.Ng3 Bc6 19.Nxh5 Nxh5 20.Qh6
Ng7 21.Bd3 Qa5 22.Rxg6 fxg6 23.Bxg6 1-0
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