Nimzo-Indian Defense: St. Petersburg Variation

What Is The St. Petersburg Variation?

4...b6 fights for one square: e4. The bishop heads to b7 or a6, and with the pin on c3 it takes the light squares White needs for e3-e4. Every game turns on whether White forces e4 through or Black freezes it, because the bishop pair White wins after ...Bxc3+ is worth nothing behind a blocked center. On a6 the bishop hits c4 and costs White a move: b3 or Qa4.

White answers with Nge2 rather than Nf3: after ...Bxc3+ the knight recaptures, so the structure stays clean and White prepares a3 and e4. Calling 4...b6 slow is the error. Black gives up the bishop pair by choice and gains time against c4, and if e4 never comes those bishops stare at their own pawns.

How Do You Play Against The Nimzo-Indian Defense: St. Petersburg Variation?

The sample is too small to lean on, with 32% for 5.Ne2 and 29% for 5.Bd3. Black has combined the pin on b4 with the fianchetto on b6, which fights for e4 from two directions at once and is the most principled setup in the Nimzo complex.

Two pieces aimed at e4 means you cannot get the pawn there for free, so stop trying and take space elsewhere. Ne2 prepares to recapture on c3 with the knight and keeps the structure clean. Bd3 and f3 is the other route, building slowly toward e4 rather than forcing it. Either way, a broad centre is not available here and pretending otherwise loses time.

What Do Players Choose At The Decision Point?

Move	Share		Games
O-O	35%		124
c5	18%		65
Bxc3+	15%		53
b6	14%		50

How Does Play Continue From Here?

Move	Share		Games
Ne2	32%		19
Bd3	29%		17
Nf3	14%		8
Bd2	8%		5