Chess Board
[ECO code E40] Move Move Here
NIMZO-INDIAN DEF. - Rubinstein Sys.
(to) Keres Variation
Black's QBP to QB4(c5) blockaded White's doubled QBPs, attacked White's QP and invited triple QBPs!
White's doubled QBP takes Black's QP on Q5(d5) and offers a choice of undoubling exchanges. W-Alt.
    White  Black	White  Black
 1. P-Q4   Kt-KB3    6.	PxB    P-B4
 2. P-QB4  P-K3	     7.	BPxP
 3. Kt-QB3 B-Kt5
 4. P-K3   P-Q4
 5. P-QR3  BxKt ch
BLACK to Move or Undo or Jump or Clear
 
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