Playing internet competitions, he has enjoyed success at the Dos Hermanas tournaments of 2004 and 2005.
It has had four spells playing in national leagues, including the third tier, the Segunda B, between 1999 and 2002.
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It plays in the Primera Andaluza, the highest league in the region.
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
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.
His prolific tournament record features many more victories, including Leningrad 1989, Calcutta 1990 Pamplona 1990/91 (also 1991/92, jointly with Illescas), Dos Hermanas 1992, Botvinnik Memorial 1995, Haifa Super Tournament 1996 and St. Petersburg White Knights 1998.
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The island's area is approximately 2,820 hectares (excluding neighboring islands Bantoncillo, and the Dos Hermanas, Carlota and Isabel).
Zumalacárregui attempted to follow a plan of battle similar to that enacted by Hannibal at Cannae: he would allow enemy forces to drive themselves into a large arc — whereupon the Carlist infantry, positioned on the flanks in the forests of Holm oaks on the mountain of Dos Hermanas, would encircle the main body of Liberal infantry and destroy it.