Reti Osnos 04 Lasker System II (2 g3)_A

5 - Lasker System II (2.g3) A) 4...c6

 1.Nf3 d5 2.g3 Nf6 3.Bg2 Bf5 4.c4

   A) 4...c6
"This natural move turns out to be a vital inaccuracy. Let us note, however, that outstanding chess players have made this error and this allows us to appreciate the subtle methods of play by which White gains the advantage." ---Osnos
   5.cxd5
Shianovsky vs Reshko
Sumiacher vs Polugaevsky
Bilek vs Smyslov
Benko vs Spassky
Tseitlin vs Platonov
Romanishin vs Piesina
Benko vs Addison
   5...cxd5
Barcza vs Tsvetkov
Barcza vs Tipary
   6.Qb3 Qc8
Roshal vs Tseshkovsky
Rossolimo vs Castillo
Dzhindzhihashvili vs Bagirov
Barcza vs Balogh**
Romanishin vs Anikaev
Benko vs Sanguinetti
Barcza vs Rossolimo
Trifunovic vs Pachman
Szabo vs Honfi
Tseitlin vs Vorotnikov
Larsen vs Bykhovsky
Kirov vs Pribyl
Barcza vs Opocensky
Szabo vs Gerusel
Benko vs Geller
Portisch vs Smyslov
   7.Nc3 e6 8.d3 Nc6 9.Bf4
Lisitsin vs Muhutdinov
Konstantinopolsky vs Weinblatt**
Konstantinopolsky vs Verlinsky
   9...Be7
Barcza vs Kopetsky
Petrosian vs Shustin**
Toran vs Bernstein
Barcza vs Nievergelt
   10.0-0 0-0 11.Rac1 Bg6
Keene vs Suess
Barcza vs Smyslov
Smyslov vs Bronstein
   12.Ne5 Nd7
Karpov vs Korchnoi

12 moves

"The reputationof this variation as being a difficult one for Black has been maintained" --- Osnos

Osnos calls 4...c6 a vtal inaccuracy yet it is the 1st choise in databases.