Chess Board
[ECO code C42] Move Move Move Here
PETROFF'S DEFENCE
The Marshall Attack

White's KB to Q3(d3) threatened BxKt and set 7.0-0.
Black also deploys his King's Bishop to the third rank to dominate K-side diagonals, and can castle. White must beware a later Marshall Trap. B-Alt.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	P-Q4   P-Q4
 2. Kt-KB3 Kt-KB3    6.	B-Q3   B-Q3
 3. KtxP   P-Q3
 4. Kt-KB3 KtxP

WHITE 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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