[ECO code C74]
The Kopayev Variation
White castles, bringing his king's rook out. This Siesta continuation examined by Nikolai Kopayev (1914-78) was popular in the 1950s. W-Alt.
White Black 5. P-B3 P-B4!? 1. P-K4 P-K4 6. PxP BxP 2. Kt-KB3 Kt-QB3 7. 0-0 3. B-Kt5 P-QR3 4. B-R4 P-Q3
BLACK to or Undo or Jump or Clear
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