Israeli Grandmaster and coach born in Ukraine, he immigrated to Israel then settle in Spain.
Best results: won or shared first in Bat-Yam, Holon, Rishon and Petah Tikva between 1981 and 1989, Kecskemet in 1994, Fourmies 1996, Sas Van Gent 1996, Ischia 1996 and Vlissingen 1996, Loures 1997, Ljubljana and Pyramiden Cup 1998, Ljubljana 1999, Almassora, Cutro Open, Quebec Open Championships, Montreal, Nordic Scandinavian Open Championship and Salou Costa Dorada 2001, Genoa 2002, Ober d’ Escacs Intl 2005, Ashdod Open 2006, la Pobla de Lillet Open 2007, Tarragona Open 2007, San Sebastian Open 2009, Sanxenxo Open Peak rating:2010, Zaragoza Open 2010, Rapid Grand Prix of Tarragona 2010, Torredembara Open 2011.
Kogan has been working as a professional trainer for more than 15 years; some of his pupils include GM Denis De Vreught, GM Alik Gershon, IM Marie Sebag, GM Temur Radjabov, the national Dutch Women’s team and the Italian team since the 2010 Olympiad.
Married to Women International Master Plachkinova-Kogan Tatiana, he is running in Spain a chess academy (http://olalachess.com).
Peak rating: 2568 in 2002.