[ECO code C51]
White castles short (ie. K-side), bringing his King's Rook into play and doubling the support for his targeted KBP. W-Alt.
White Black White Black 1. P-K4 P-K4 6. 0-0 2. Kt-KB3 Kt-QB3 3. B-B4 B-B4 4. P-QKt4 B-Kt3 5. P-QR4 P-QR3
BLACK to or Undo or Jump or Clear
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