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Paul Keres has been one of the world's top players for 30 years, and since his victory at the AVRO Tournament in 1938, he has always been considered a likely candidate for the world championship. In the candidate tournaments he has finished second several times, but not first and so he never qualified to play for the world championship.
Keres is considered a player who is equally good at opening, middlegame and endgame, attack and defence. He also showed this in his game against the Finn Heikki Westerinen. The game went on for a long time, but in the end Keres gained the upper hand and ultimately he won the game.
World Champion Tigran Petrosian cannot keep up with the pace Keres is setting. In round 9, Petrosian had just barely escaped a defeat with black against Ivkov. Similarly in round 10, Petrosian could only save half a point with a lot of luck, because an oversight in the endgame could have easily cost him the game.
Helmut Pfleger gave a strong performance against Milko Bobotsov and outplayed the Bulgarian number one from the opening.
Borislav Ivkov achieved an unexpectedly quick and easy win against Klaus Klundt. In the Fianchetto variation of the King's Indian both black knights stranded on the rim and Klundt seemed so disgusted by this that he resigned after 28 moves though materially the position was still equal.
The Dutch Grandmaster Jan Hein Donner, who enjoys a very good reputation as a chess journalist, has inexplicably lost many short games in his career. But he did better against the Hungarian Grandmaster Laszlo Szabo, and it was Szabo who had to give up after only 24 moves because he could not avoid serious material loss.
Wolfgang Unzicker played with Black against Andreas Dückstein and with strong strategic play in a line of the Ruy Lopez he quickly had a winning position. But at the decisive moment Unzicker did not play energetically enough and let Dückstein escape with a draw.
Jürgen Teufel showed a good performance: He outplayed Roman Toran by simple means to achieve his second win in the tournament.
Hans-Günter Kestler and Rudolf Teschner played the only uneventful game of the round: they drew after 22 unexciting moves.
This enabled Keres to extend his lead to 1.5 points and now, after 10 out of 15 rounds, he is the sole leader with 8.5 out of 10. Petrosian and Ivkov follow in second place with 7.0 out of 10 each.
| 1 | Juergen Teufel | 1 - 0 | Roman Toran Albero |
| 2 | Laszlo Szabo | 0 - 1 | Jan Hein Donner |
| 3 | Paul Keres | 1 - 0 | Heikki MJ Westerinen |
| 4 | Hans Guenter Kestler | ½ - ½ | Rudolf Teschner |
| 5 | Milko Georgiev Bobotsov | 0 - 1 | Helmut Pfleger |
| 6 | Andreas Dueckstein | ½ - ½ | Wolfgang Unzicker |
| 7 | Tigran V Petrosian | ½ - ½ | Lothar Schmid |
| 8 | Borislav Ivkov | 1 - 0 | Klaus Klundt |
| Rg. | Name | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | Pkt. |
| 1 | Paul Keres | ½ | 1 | 1 | 1 | ½ | ½ | 1 | 1 | 1 | 1 | 8.5 / 10 | ||||||
| 2 | Tigran V Petrosian | ½ | ½ | ½ | ½ | ½ | 1 | 1 | ½ | 1 | 1 | 7.0 / 10 | ||||||
| 3 | Borislav Ivkov | 0 | ½ | ½ | 1 | ½ | ½ | 1 | 1 | 1 | 1 | 7.0 / 10 | ||||||
| 4 | Wolfgang Unzicker | ½ | ½ | ½ | ½ | ½ | 1 | 1 | ½ | 1 | ½ | 6.5 / 10 | ||||||
| 5 | Lothar Schmid | 0 | ½ | ½ | ½ | ½ | 1 | ½ | ½ | 1 | 1 | 6.0 / 10 | ||||||
| 6 | Rudolf Teschner | ½ | ½ | ½ | ½ | 0 | 1 | ½ | 1 | ½ | 1 | 6.0 / 10 | ||||||
| 7 | Heikki MJ Westerinen | 0 | 0 | 0 | ½ | 1 | 1 | 1 | 1 | ½ | 1 | 6.0 / 10 | ||||||
| 8 | Jan Hein Donner | ½ | ½ | ½ | ½ | 1 | 0 | 0 | 1 | 1 | 1 | 6.0 / 10 | ||||||
| 9 | Helmut Pfleger | 0 | 0 | ½ | ½ | ½ | ½ | 1 | 1 | 1 | ½ | 5.5 / 10 | ||||||
| 10 | Milko Georgiev Bobotsov | ½ | ½ | 0 | 1 | 0 | 1 | 0 | 1 | ½ | ½ | 5.0 / 10 | ||||||
| 11 | Laszlo Szabo | ½ | 0 | ½ | 0 | 0 | 0 | 0 | ½ | 1 | 1 | 3.5 / 10 | ||||||
| 12 | Hans Guenter Kestler | 0 | ½ | 0 | ½ | 0 | 0 | ½ | ½ | 1 | ½ | 3.5 / 10 | ||||||
| 13 | Juergen Teufel | 0 | 0 | ½ | 0 | 0 | 0 | ½ | 1 | 1 | ½ | 3.5 / 10 | ||||||
| 14 | Roman Toran Albero | 0 | 0 | 0 | ½ | ½ | 0 | 0 | ½ | 0 | ½ | 2.0 / 10 | ||||||
| 15 | Klaus Klundt | 0 | 0 | 0 | ½ | ½ | 0 | 0 | 0 | ½ | ½ | 2.0 / 10 | ||||||
| 16 | Andreas Dueckstein | 0 | 0 | 0 | ½ | 0 | 0 | 0 | ½ | ½ | ½ | 2.0 / 10 |
Translation from German: Nick Murphy
