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Normal Topic The value of a tempo in the opening (Read 1316 times)
FreeRepublic
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Re: The value of a tempo in the opening
Reply #2 - 10/12/22 at 19:38:30
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MNb wrote on 10/12/22 at 17:28:12:
A good example of an extra tempo helping the opponent is the famous Colle-O'Hanlon game, Nice 1930. If White tries this via the French Rubinstein variation (hence e2-e4 iso e2-e3-e4) the rook is on f8. So 10...cxd4 (iso 11...cxd4 as in the game) 11.Bxh7+ fails to Kxh7 12.Ng5+ Kh8 13.Qh5 Nf6.


Yes, a very good example. Here's the entire score:

1.d4 d5 2.Nf3 Nf6 3.e3 c5 4.c3 e6 5.Bd3 Bd6 6.Nbd2 Nbd7 7.O-O O-O 8.Re1 Re8 9.e4 dxe4 10.Nxe4 Nxe4 11.Bxe4 cxd4 
12.Bxh7+ Kxh713.Ng5+ Kg6 14.h4 Rh8 15.Rxe6+ Nf6 16.h5+ Kh6 17.Rxd6 Qa5 18.Nxf7+ Kh7 19.Ng5+ Kg8 20.Qb3+ 1-0

In each case, Re1 (or ...Re8) leaves the f2 (f7) pawn vulnerable.
  
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MNb
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Re: The value of a tempo in the opening
Reply #1 - 10/12/22 at 17:28:12
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A good example of an extra tempo helping the opponent is the famous Colle-O'Hanlon game, Nice 1930. If White tries this via the French Rubinstein variation (hence e2-e4 iso e2-e3-e4) the rook is on f8. So 10...cxd4 (iso 11...cxd4 as in the game) 11.Bxh7+ fails to Kxh7 12.Ng5+ Kh8 13.Qh5 Nf6.
  
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The value of a tempo in the opening
10/12/22 at 14:14:39
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One might think that it has to help to have an extra tempo in the opening. Perhaps not.

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1. d4 d5 2. c4 e6 3. Nc3 c5 4. cd5 ed5 5. Nf3 Nc6 6. g3 c4 7. Bg2 Nf6 8. O-O Be7 9. b3 cb3 10. Qb3 O-O 11. Rd1 Na5 12. Qb1 h6 13. Bf4 a6 14. Ne5 Be6 15. e4 Rc8 16. ed5 Nd5 17. Nd5 Bd5 

The game is about equal. White might do best to avoid the exchange of Bishops, perhaps by playing 18Bh3. 18.Qf5 would allow the exchange and favors Black.

What if we played a reverse opening, granting an extra tempo?

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1. e4 c6 2. d4 d5 3. ed5 cd5 4. c4 Nf6 5. Nc3 g6 6. Nf3 Bg7 7. c5 O-O 8. Be2 b6 9. cb6 Qb6 10. O-O Nc6 11. Re1 Rd8 12. Na4 Qb8 13. h3 Bf5 14. a3 Ne4 15. Be3 e5 16. Rc1 ed4 17. Nd4 Nd4 18. Bd4

Now 18...Qf4, which failed before, works out. The extra tempo, Re1, leaves the f2 square vulnerable.
  
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