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Frank Marshall vs Vladimir Petrov
Hamburg Olympiad (1930), Hamburg GER, rd 6, Jul-17
Bogo-Indian Defense: Nimzowitsch Variation (E11)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Aug-17-07
Premium Chessgames Member
  chancho: 16...bxc5 17.Qh5 (the f6 pawn cannot move without leaving the black Queen enprise) 16...Qxc5 17.Qh5 is no better.
Jul-25-16
Premium Chessgames Member
  fredthebear: In the final position, if Black accepts the rook sacrifice, 17.Qh4 will mate in one.

The real spark is 14.BxNf6 offering up the queens. This bishop sortie falls under a productive, usually forcing tactical concept of "capture with a threat to capture again." Black was seemingly correct to recapture w/the g-pawn.

What if Black decides to play knight-takes-queen instead of recapturing the White bishop w/the g-pawn? Initially, it looks like the Black knight can make three consecutive piece captures following each of the White bishop's three consecutive piece captures and things come out even. Not so. White interrupts the sequence after two bishop captures. Thus, 14.BxNf6 NxQb3 15.BxQe7 NxRc1 and then comes 16.RxNc1 and Black is down a piece w/his king's rook still en prize while the White rook sits on only open file.

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