Simplify the following text for a Grade 11 native English-speaking person.
Original: In the New York 1927 chess tournament , played from February 19 to March 23 , 1927 , six of the world 's strongest masters played a quadruple round robin , with the others being Alekhine , Rudolf Spielmann , Milan Vidmar , Nimzowitsch and Marshall , with Bogoljubow and Emanuel Lasker not present .
Simplified: In the New York 1927 chess tournament , six of the world 's strongest masters played each other four times , the others being Alekhine , Rudolf Spielmann , Milan Vidmar , Nimzovich and Marshall , lacking Bogolyubov and Lasker .