Chess Board
[ECO code C02]
FRENCH DEFENCE - Advance Var.
Paulsen Attack
Black developed his KB to QKt5(b4) with check, so that if White interposed a piece his QP would fall.
White's King moves to KB1(f1) and cannot castle. Black has equality despite an undeveloped QB.
    White  Black	White  Black
 1. P-K4   P-K3	     6.	B-K2   PxP
 2. P-Q4   P-Q4	     7.	PxP    KKt-K2
 3. P-K5   P-QB4     8.	P-QKt3 Kt-B4
 4. P-QB3  Kt-QB3    9.	B-Kt2  B-Kt5 ch
 5. Kt-B3  Q-Kt3    10.	K-B1
Example ends: Undo or Jump or Clear