Chess Board
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NIMZO-INDIAN DEFENCE
Sämisch Variation

Black's QKt5(b4) bishop under attack took White's knight on QB6(c3) with check to initiate an exchange.
White's QKtPawn removes the bishop, resulting in doubled QBPs. This pawn group (with undefended QB4(c4) pawn) is known as a Wyvill formation.
    White  Black	White  Black
 1. P-Q4   Kt-KB3    5.	PxB
 2. P-QB4  P-K3
 3. Kt-QB3 B-Kt5
 4. P-QR3  BxKt ch

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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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