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Three grandmasters and five international masters are in Wrexham for the second Owens Corning International. The most illustrious among them is David Bronstein, now 71, who tied a match for the world championship before most of the other contestants were even born.

Bronstein began with a loss to Christa Hartman of Sweden, which left the stage clear for Malcolm Pein to provide the brilliance.

Black's 16...Qb7, instead of the simple Bxg2, is asking for trouble, and 17.Nf5! supplies it splendidly. After 17...Bxg2 18.Rxd7! Qxd7 19.Nh6+! Kh8 (or 19...gxh6 20.Qxf6) 20.Qxf6! gxf6 21.Bxf6, Black is mated. At the end, the threats of exd5 and Qg5+ are more than Black can stand.

White: Malcolm Pein

Black: Tomas Engqvist

Nimzo-Indian Defence

1 Nf3 Nf6 11 Bb2 Qc7

2 c4 e6 12 Rad1 a6

3 Nc3 Bb4 13 d4 d5

4 Qc2 0-0 14 dxc5 bxc5

5 a3 Bxc3 15 cxd5 Bxd5

6 Qxc3 b6 16 Nh4 Qb7

7 g3 Bb7 17 Nf5 Kh8

8 Bg2 d6 18 Nxg7 Kxg7

9 0-0 Nbd7 19 e4 Qxb3

10 b3 c5 20 Qc1 resigns