Chess Board
[ECO code C42] Move Move Move Move Here Move Here
PETROFF'S DEFENCE
The Jaenisch Variation
Black developed his KB and QKt and enabled castling, poised to counter-attack White's QP.
White advances his Queen's Bishop's Pawn to QB4(c4), planning 9.PxP enabling 10.BxKt. W-Alt.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	B-Q3   B-K2
 2. Kt-KB3 Kt-KB3    7.	0-0    Kt-QB3
 3. KtxP   P-Q3	     8.	P-B4
 4. Kt-KB3 KtxP
 5. P-Q4   P-Q4
BLACK to Move or Undo or Jump or Clear
 
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When castling always touch the king first
Under FIDE laws of chess, if a player deliberately touches a rook and then his king, he is not allowed to castle on that side on that move but must still move the rook if legally possible.

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