domingo, 23 de agosto de 2009

tradechess x PocketGrandmaster on Ipaq 6515!

When I win, I like to publish my games. I dont like to play e4, always play d4! However, today I have played e4 and against e4, the computer played e5. I dont know this gambit, so from the site I have the following statement of this open book:

I'm beginning to believe this less common version of the Schliemann Defense may be black's best try.

1.e5 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 Nf6!?

The normal move is 4...fxe and then after Nxe4 either 5...Nf6 or 5...d5. I would really like to understand the motivation behind 4...fxe. Black first offered a gambit and then after white is hesitant to accept it, why doesn't he offer it again with 4...Nf6!? It appears to me that fxe fails to accomplish 3 possible goals of the gambit: Deflection, Developement and Opening Lines.

In T.D. harding's book on counter gambits (open games section) he writes: "f5 is primarily a deflecting move, seeking to obtain a strong pawn centre at the cost of weakening the king's position". By playing 4...fxe black voluntarilly gives up on the idea of deflecting the e4 pawn from the center.

In Schiller's book on gambits he comments that a wing pawn gambit is often played in hopes of gaining a lead in developement. In an ideal world, white would play exf5 and at some point black gets to play Bxf5. The net result would be a gain of 1 tempo and development because white made two pawn moves to black's one. Instead, 4...fxe4 encourages 5.Nxe4, which only helps move white's army forward. Although the jury is still out, most people agree that black's tactical try 5...d5 is close to refuted and hence does not justify fxe4.

Opening Lines:
Of course black would love to use the open f file to attack white's king after he castles kingside. 4...fxe4 does open up this file for black, but it seems premature. Black cannot use this half open file untill after he moves his king's knight and bishop and then plays O-O. fxe4 is effectively opening lines for white, who is up a tempo and can use the e file to presure black in the variant 4...fxe Nxe4 5...Nf6. 4...Nf6 gets black one move closer to O-O so that he might be able to use that open file!

So why not play 4...Nf6 and offer the gambit pawn again? From a practical perspective it may be a better move since it doesn't appear in the opening theory that your booked-up Ruy Lopez opponents love so much. From an objective viewpoint, if it cannot be refuted, it is certainly no worse than 4...fxe.

Some example lines to consider:


1.e5 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 Nf6!? 5.exf5 e4 6.Ng5 d5 7.O-O Bxf5
White accepts the gambit giving black a big center. Can black get castled quickly enough to survive white's attempts to undermine it?

Opening Lines / Development:

1.e5 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 Nf6!? 5.Bxc6 dxc 6.Nxe5 Bc5 7.d3 O-O 8.O-O fxe!
Now black can hope to use that half open file. Does he have enough pressure to compensate for being down a pawn?

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