[ECO code B93]
The 6.f4 (Amsterdam?) Variation
White's King's Bishop's Pawn to KB4(f4) seeks 6..P-K4, 7.Kt-B5 for slight advantage. Named "Amsterdam" in a 2004 compiled list by Eric Schiller. W-Alt.
White Black White Black 1. P-K4 P-QB4 6. P-B4 2. Kt-KB3 P-Q3 3. P-Q4 PxP 4. KtxP Kt-KB3 5. Kt-QB3 P-QR3
BLACK to or Undo or Jump or Clear
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