[ECO code C21]
The Collijn Variation
Black's Queen to K2(e7) threatens 6..QxP+ch. The Swedish Collijn brothers produced many books on 19th/20th C. Scandinavian tournaments. B-Alt.
White Black 1. P-K4 P-K4 2. P-Q4 PxP 3. P-QB3 PxP 4. B-QB4 PxP 5. BxP Q-K2
WHITE to or Undo or Jump or Clear
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