White plays a3 to rule out ...Bb4 and then builds the ideal centre with Nc3. Black challenges with ...d5 and reaches a comfortable, symmetrical structure.
LinesPractice Mode
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You (Black)
Waiting for White...
ProgressMove 1 of 7
Move Sequence
1.d4Nf6
2.c4e6
3.Nf3b6
4.a3Bb7
5.Nc3d5
6.cxd5Nxd5
7.e3Be7
Current linePetrosian System
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Reps
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Streak
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Learned
Earn a tick by completing the line without a mistake. 3 ticks = learned.