White: GM Robert Byrne
Black: Peter Bereolos
1988 North American Class Championships
Round 1 Board 7

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Bb7 10.d4 Re8 11.Nbd2 Bf8 12.a3 h6 13.Bc2 Nb8 14.b4 Nbd7 15.Bb2 g6 Later Karpov introduced 15...a5 16.Bd3 c6 17.Nb3 axb4 18.cxb4 exd4 19.Nfxd4 c5! in his Candidates match against Hjartarson in Seattle 1989 16.c4 16.Qb1 later replaced this as the most popular alternative. 16...exd4 17.cxb5 axb5 18.Nxd4 c6

This tableau was tested at the very highest levels in the year's preceding this game with then #3 Timman as White taking on #1 Kasparov and #2 Karpov. There were 3 games between Timman and the K's beginning with 19.a4 a draw with Karpov at Tilburg 1979 and a win and a loss against Kasparov in their match at Hilversum 1985. The loss by Kasparov was his first after gaining the world title from Karpov. 19.Rc1 Qb6 20.Bb1 Bg7 21.Qb3 Re7 22.Re3 Kh7 23.Rce1 Rae8 24.N4f3 c5 25.bxc5 Nxc5 Played to keep control of e5, but at the cost of a couple of isolated pawns. 25...dxc5 was a decent alternative since 26.e5 Nd5 is awkward for White 26.Qb4 Na6 27.Bd4 Nxb4 28.Bxb6 Na6 29.Bd3 Bc6 29...b4 30.Bxa6 Bxa6 31.axb4 Rb7 and the two bishops give Black compensation. 30.Rc1 Nb8 31.Nd4 Bxe4 32.Nxe4 Nxe4 33.Bxb5 Nd7 34.Ba7 Ra8 35.Nc6 Ree8 36.a4 Nef6 37.a5 Rxe3 37...Rec8 38.Rec3 Rc7 39.Bd4 Ne4 40.Bxg7 Kxg7 41.R3c2 Nec5 keeps White advantage to a minimum 38.Bxe3 Ne5 this looks like the losing moment. I needed to try bringing everybody to the queenside with 38...Nd5 39.Bd2 Nc7 40.Bc4 d5 but White still has a nice pull. 39.a6 Nd5? loses quickly, but the position after 39...Nxc6 40.Rxc6 d5 41.a7 is also hopeless 40.Nxe5 Bxe5 41.Bc6 Rxa6 42.Bxd5 Ra5 43.Bxf7 1-0

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