 In one of Adorján 's books , GM Lajos Portisch opined that " at least two @-@ thirds of all ' tested ' openings give White an apparent advantage . " According to Portisch , for Black , " The root of the problem is that very few people know which are the openings where Black is really OK . Those who find these lines have nothing to fear , as Black is indeed OK , but only in those variations ! " Rowson considers this an important point , noting that " 1.d4 players struggle to get anywhere against main @-@ line Slavs and 1.e4 players find the Najdorf and Sveshnikov Sicilians particularly tough . " 
 In one of Adorján <a href='null_genetive' title='1'><mark>'s</mark></a>books , GM Lajos Portisch opined that " at least two @-@ thirds of all ' tested ' openings give White an apparent advantage . " According to Portisch , for Black , " The root of the problem is that very few people know which are the openings where Black <a href='drop_aux' title='2'><mark>is</mark></a>really OK . Those <a href='null_relcl' title='3'><mark>who</mark></a>find these lines <a href='got' title='4'><mark>have</mark></a> nothing to fear , as Black <a href='drop_aux' title='5'><mark>is</mark></a>indeed OK , but only in those variations ! " Rowson <a href='uninflect' title='6'><mark>considers</mark></a> this an important point , noting that " 1.d4 players struggle to get anywhere against main @-@ line Slavs and 1.e4 players find the Najdorf and Sveshnikov Sicilians particularly tough . " 
In one of Adorján  books , GM Lajos Portisch opined dat " at least two @-@ thirds of all ' tested ' openings give White an apparent advantage . " According to Portisch , for Black , " The root of da problem is that very few folks know which r the openings where Black really ight . Those find these lines got nothing to fear , as Black indeed OK , but only in those variations ! " Rowson consider this an important point , nuffin tdat" 1.d4 players struggle to get anywhere against main @-@ line Slavs and 1.e4 players find tdaNajdorf and Sveshnikov Sicilians particularly tough . "