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Jan Hein Donner vs Tigran Vartanovich Petrosian
Gothenburg Interzonal (1955), Gothenburg SWE, rd 21, Sep-21
Benoni Defense: Knight's Tour Variation (A61)  ·  0-1


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Kibitzer's Corner
Jul-26-08  sneaky pete: Position after 30... b5

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How should white continue?

Jul-26-08  Kangaroo: 31. e5!???
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  Flemming: 31. e5?? Rc6
Apr-30-17  sneaky pete: Donner once wrote that Lodewijk Prins didn't know the difference between a Bishop and a Knight. Our friend <Flemming> doesn't know the difference between a Rook and a Knight.
Premium Chessgames Member
  Flemming: 31. ...Rb6 (*not Rc6 (typo))
May-04-17  sneaky pete: <Kangaroo> was right. 31.e5 Rb6 32.Rxa5 Rxc6 33.dxc6 Qxa5 34.exd6 ..

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This line was indicated by Petrosian immediately after the game. It's been said that two connected passed pawns on rank six are worth at least a Rook. They are here. Black can force a draw with 34... Qxc3 35.Rd1 Qb3 36.Re1 Qc3 etc, but that seems to be the best he can do.

May-04-17  tonsillolith: After Black's <34...bxc3> we have an interesting phenomenon. Both of White's major pieces are aiming at Black's c3 pawn, but it only takes the single black queen to defend it, due to the obstruction of the c5 pawn. However the c5 pawn also requires defense.

So the two straight actions of the white pieces are countered by the straight and the diagonal actions of the single black piece.

This is a nice example of a way to accomplish more with your pieces. A beginner's perspective is that a piece must be defended positionally, i.e. with another piece guarding its square directly. But the more advanced a player becomes, the more ways he/she understands of defending a piece tactically. You just don't have enough moves or pieces to do what you want directly, so you have to find more and more indirect ways to accomplishing your aims.

May-04-17  tonsillolith: Another thing we can see here is how doubled pawns on a file can be worth much more than one. Even if only one of the pawns has much chance of advancing or queening, the second pawn can be used to protect the first.
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