Chess Board
[ECO code B01]
CENTRE COUNTER (or SCANDIN.) DEF.
The Collijn Variation
White's KKt defended his QP and enabled 6.PxP.
Black develops his Queen's Bishop to KKt5(g4) to pin White's Kt+Q. The Swedish Collijn brothers produced many books on 19th/20th century Scandinavian tournaments. B-Alt.
    White  Black	White  Black
 1. P-K4   P-Q4	     5.	Kt-B3  B-KKt5
 2. PxP	   QxP
 3. Kt-QB3 Q-QR4
 4. P-Q4   P-K4
Example ends: Undo or Jump or Clear