411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...c5/2. Nf3/2...e6/3. d4/3...cxd4/4. Nxd4/4...Nc6/5. Nc3/5...Qc7
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Bastrikov variation Taimanow variation B47
5...Qc7 · Bastrikov variation
Black chooses to develop their queen to a safe square where it has good scope.
6. Be3 is the most common move. White develops their bishop to an active square where the knight on d4 is defended from any potential ...Nxd4 exchanges that may happen in the future. White may be preparing to castle long, 6...a6 7. Qd2 Nf6 8. O-O-O, or is overdefending their knight so that they may play 7. Bd3 and castle short.
6. Be2 develops the king's bishop without obstructing the queen's defence of d4, and prepares to castle short, 6...a6 7. O-O.
6. Nxc6 does not wait to exchange knights. White decides that it is finally time to settle the trade offer by accepting.
6. Ndb5 is the most aggressive move. White immediately goes on the offensive and attacks the newly placed queen on c7 with their knight.
References
See also