Rossolimo-Moscow Powerbook 2020

This first edition of the Rossolimo/Moscow Powerbook was based on an Elo average of at least 2400. Thus 25 000 games from Mega and from Correspondence Chess met the threshold for the Powerbook, and to them have been added 226 000 games from the engine room of playchess.com. Previous White played above all 3.Bb5 against both 2...Nc6 and 2...d6, when he wanted to surprise an opponent. But recently there has been an enormous development in theory and no one is surprised any more if the ambitious Rossolimo Variation even plays an important role in a WCh match, as it did in Carlsen against Caruana (November 2018). On the other hand, the Moscow Variation is considered relatively harmless, above all whenever the light-squared bishops are quickly exchanged. What is striking in the Powerbook is the high number of games with the hybrid of the Rossolimo and Moscow Variations: 2...Nc6 3.Bb5 d6 or 2...d6+ 3.Bb5 Nc6. From Black’s point of view this line does not have the best of reputations, but that cannot be demonstrated with the Powerbook.
It is also possible to make nice discoveries with the Rossolimo/Moscow Powerbook 2020. a) Moscow Variation: After 2...d6 3.Bb5+ the modern 3...Nd7 does not look so good at all (but 3...Bd7, on the other hand, does). “Simply” 4.d4 cxd4 5.Qxd4 a6 and as well as the traditional 6.Bxd7+ Bxd7 7.c4 White also has 6.Be2!? with fresh ideas and almost more than 1500 games in the Powerbook (Mega+Corr 2020 approx.100 games). b) Rossolimo Variation: 2...Nc6 3.Bb5 g6 4.0-0 Bg7 5.c3 (Magnus Carlsen has not yet had to face this move) 5...Nf6 6.Re1 0-0 7.h3 (7.d4 has proven less successful) 7...e5

and now the sharp 8.d4 can be studied with the Powerbook, which in this case is based on the statistics of over 1000 games (Mega 2020 approx. 130 games).
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