[ECO code D04]
(to) Colle System
Black replies with the same move, despite blocking his QB in temporarily.
White Black 1. P-Q4 P-Q4 2. Kt-KB3 Kt-KB3 3. P-K3 P-B4 4. QKt-Q2 QKt-Q2
WHITE to or Undo or Jump or Clear
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