[ECO code E81 > 89]
Black castles, bringing his King's Rook into play. Next he must strike a blow against White's centre (and force it to advance) without delay. B-Alt.
White Black 1. P-Q4 Kt-KB3 2. P-QB4 P-KKt3 3. Kt-QB3 B-Kt2 4. P-K4 P-Q3 5. P-B3 0-0
WHITE to or Undo or Jump or Clear
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