Chess Board
[ECO code C43] Move Move Move Move Here Move Here Move Here
PETROFF TRANSPOSITION
STEINITZ ATTACK to MAIN LINE
Black's QP attacked White's Kt to gain a tempo.
White's Knight under attack on K5(e5) retreats to its initial developed position, even though this (the standard text-move) loses him a tempo. 
    White  Black    Main 3W-5W route
 1. P-K4   P-K4		  (1.)
 2. Kt-KB3 Kt-KB3	  (2.)
 3. P-Q4   KtxP	    (3.	KtxP   P-Q3)
 4. KtxP   P-Q3	    (4.	Kt-KB3 KtxP)
 5. Kt-KB3	    (5.	P-Q4	   )
BLACK to Move or Undo or Jump or Clear
 
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