Chess Board
[ECO code C42] Move Move Move Here
PETROFF'S DEFENCE
Ruy Lopez Variation

White's King's Bishop develops to K2(e2) to stop 6..Kt-QB6[or -KB3]+disc.ch, and enables 0-0.
Black's Queen moves from K2(e2) to Q2(d2), losing a tempo and blocking his QB but freeing his KB for a 7..B-K2 shield.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	Kt-KB3 KtxP
 2. Kt-KB3 Kt-KB3    6.	B-K2   Q-Q2
 3. KtxP   Q-K2
 4. P-Q4   P-Q3

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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