[ECO code C66]
The Chigorin Variation
Black doubles his KP defence by moving his K-side Knight over to Q2(d7), halving the QKt pin. B-Alt.
White Black White Black 1. P-K4 P-K4 5. P-Q4 Kt-Q2 2. Kt-KB3 Kt-QB3 3. B-Kt5 Kt-B3 4. 0-0 P-Q3
Example ends: Undo or Jump or Clear