Chess Board
[ECO code E91] Move Move Move Here Move Here
Old Main Line (alt. route)

White castles (as in the main), bringing his King's Rook into play closer to the centre.
Black's King's Pawn to K4(e5) challenges White's QP. Other route "chief" since 1960s ECO coding.
    White  Black	White  Black
 1. P-Q4   Kt-KB3    6.	B-K2   QKt-Q2
 2. P-QB4  P-KKt3    7.	0-0    P-K4
 3. Kt-QB3 B-Kt2
 4. P-K4   P-Q3	    Main 7B,6B route
 5. Kt-B3  0-0	   Transp.from Old Ind.

WHITE to Move or Undo or Jump or Clear
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