 Two decades later , statistician Arthur M. Stevens concluded in The Blue Book of Charts to Winning Chess , based on a survey of 56 @,@ 972 master games that he completed in 1967 , that White scores 59 @.@ 1 % . However , Stevens assembled his games from those that had been published in chess magazines , rather than complete collections of all the games played in particular events . 
 Two decades later , statistician Arthur M. Stevens concluded in The Blue Book of Charts to Winning Chess , based on a survey of 56 @,@ 972 master games <a href='null_relcl' title='1'><mark>that</mark></a>he completed in 1967 , that White <a href='uninflect' title='2'><mark>scores</mark></a> 59 @.@ 1 % . However , Stevens assembled his games from those <a href='null_relcl' title='3'><mark>that</mark></a><a href='been_done' title='4'><mark>had</mark></a> been published in chess magazines , rather than complete collections of all the games played in particular events . 
2 decades later , statistician Arthur M. Stevens concluded in The Blue Book of Charts to Winning Chess , based on a survey of 56 @,@ 972 master games he completed in 1967 , that White score 59 @.@ 1 % . However , Stevens assembled his games from those done been published in chess magazines , rather den complete collections of alll da games played in particular events .