Chess Board
[ECO code E40]
NIMZO-INDIAN DEF. - Rubinstein Sys.
Rubinstein (& Samisch) Side Var.
White's QKtP exchanged B-for-Kt on QB3(c3).
Black castles unwisely (rather than advance 6..P-B4) at this stage, having already advanced his QP, for White can gain an advantage. B-Alt.
    White  Black	White  Black
 1. P-Q4   Kt-KB3    6.	PxB    0-0?!
 2. P-QB4  P-K3
 3. Kt-QB3 B-Kt5
 4. P-K3   P-Q4
 5. P-QR3  BxKt ch  Transp. 6B,4B route
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