[ECO code A46]
(to) Colle System
Black's Queen's Knight develops to the Q-file to counter White's KP influence on his QB4+K4(c5+e5).
White Black 1. P-Q4 Kt-KB3 2. Kt-KB3 P-K3 3. QKt-Q2 P-Q4 4. P-K3 QKt-Q2
WHITE to or Undo or Jump or Clear
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