In 2000 in Germany he won in his first appearance the International Neckar Open in Deizisau, Stuttgart.
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Bu won the World University Chess Championship, held in Guimarães (Portugal), 20–26 August, with 8/9 (+7−0=2).
Bu Xiangzhi (2607) – Krishnan Sasikiran (2657), Dos Hermanas Internet Chess Club 2005; D85
1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.Na4 e5 6.dxe5 Nc6 7.a3 Nxe5 8.e4 Nb6 9.Qxd8+ Kxd8 10.Bg5+ Be7 11.0-0-0+ Ke8 12.Bf4 Bd6 13.Nxb6 axb6 14.Kc2 Bd7 15.Bxe5 Bxe5 16.Nf3 Bf6 17.Bc4 Ba4+ 18.Bb3 Bc6 19.Bd5 Ke7 20.e5 Bg7 21.Bxc6 bxc6 22.Nd4 c5 23.Nc6+ Ke6 24.f4 Ra4 25.g3 b5 26.Rhe1 Rha8 27.Nd8+ Ke7 28.e6 f5 29.Rd7+ 1–0
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Various famous players such as Swiss Grandmaster Viktor Korchnoi, Chinese Super-grandmaster Bu Xiangzhi, American GM Walter Browne, Scottish GM Jonathan Rowson, Russian GM Andrei Kharlov, Israeli GM Vitali Golod and Croatian GM Bogdan Lalić have employed it at some time or another, though few have made it their main line against the Grünfeld Defence.
At Dos Hermanas the following year, he shared third behind Fridman and Bu Xiangzhi (with Sergey Volkov) and at the 2005 Hengelo Stork Young Masters event, he finished one-half point behind the Russian grandmaster Alexander Riazantsev.
At the 1998 Disney World Rapid Chess Championship for Kids, held November 15–17 at the EuroDisney theme park in Paris, Paragua and Bu Xiangzhi each finished first with 7½ points in the boys' 14 and under section, with Paragua taking the gold medal on tiebreak points.