ExplorationMagnificent seven: Nigeria opens door to deep-water biddersSeven blocks up for grabs in western Niger Delta near big Bosi and Ogo discoveries, with pre-bid meeting set for this monthExploration opening: a cowboy actor rides his horse through a western movie set in Spain, where Steve McQueen charged the barren hills in The Magnificent Seven.Photo: REUTERS/SCANPIXIain EsauLondon