[ECO code A20]
The Bremen (or Carls) Variation (alt. route)
White develops his Queen's Knight to QB3(c3) and counters Black's KKt influence on the centre. Black may reply with a "closed" 3..B-QKt5 half-pin.
White Black 1. P-QB4 P-K4 2. P-KKt3 Kt-KB3 3. Kt-QB3 Main 3W,2W route
BLACK to or Undo or Jump or Clear
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