Azerbaijani grandmaster Shahriyar Mammadyarov has defeated German Arkadij Naiditsch in a first round of an international tournament in Dortmund, Germany.
The day's other results are as follows: Ukrainian Ruslan Ponomariov 1-0 Hungarian Peter Leko, Russian Vladimir Kramnik 0.5-0.5 Vietnamese Le Quang Liem.
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