Chess Board
[ECO code C42] Move Move Here
PETROFF'S DEFENCE
White's queen's pawn advance freed his QB and supported a possible second Kt-K5(e5).
Black's Q3(d6) Pawn push on to Q4(d5) loses the tempo gained earlier but opens his KB line, defends his KKt and deters 6.B-QB4. Equality. B-Alt.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	P-Q4   P-Q4
 2. Kt-KB3 Kt-KB3
 3. KtxP   P-Q3
 4. Kt-KB3 KtxP
WHITE to Move or Undo or Jump or Clear
 
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