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Reti Opening Powerbook 2025

The Reti Opening Powerbook was based on an average of at least 2300 games. This means that 137,000 games from Mega and correspondence chess exceeded the Powerbook's entry threshold, plus 295,000 games from the playchess.com engine room. The original move order a la Richard Reti is 1.Nf3 d5 2.c4 followed by a fianchetto with g3 or b3 (or even the double fianchetto), but nowadays the term Reti opening is much broader and includes almost all possible variations after 1.Nf3 that do not go directly into well-known ‘grand’ openings. One plays 2.g3 (sometimes also 2.b3) more flexibly, usually followed by 3.Bg2 and 4.0-0. Depending on Black's set-up, one then decides how to proceed. The Reti-Powerbook includes as many game openings as possible after 1.Nf3, but no variations with early d2-d4, which would lead to the Catalan or King's Indian, for example. )

The most popular moves are 1...d5 2.g3 Nf6 3.Bg2 c6 4.0-0 and now Black has to choose between the almost equally often played 4...Bg4 and 4...Bf5. The latter seems to be a good choice because of the preservation of the bishop, but the Powerbook shows a path to an advantage for White: 5.c4 e6 6.Qb3 Qb6 7.d3

and in addition to the statistics in White's favour, the engine also shows that Black doesn't have an easy life here. Anyone who understands 1.Nf3 primarily as the King's Indian on the move will not be able to avoid the King's Indian Attack. The variations that arise after 1.e4, in which White continues with Sf3 and d3 (Sicilian and French), have therefore also been included in the Powerbook. A classic main line leads to e.g. 1.Nf3 d5 2.g3 Nf6 3.Bg2 c5 (second most played) 4.0-0 e6 5.d3 Nc6 6.Nbd2 Le7 7. e4 (this adds games played after 1.e4 e6 2.d3 etc.) 7...0-0 8.Te1 b5 9.e5 Nd7 10.Nf1 a5 11.h4 b4 12.Bf4 Ba6 13.N1h2 a4 14.a3

Here the Powerbook is still based on over 1000 games and sees a slight plus for White.

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