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Queen's Gambit Accepted or Declined?

Posted: Sat Oct 03, 2015 7:37 pm
by Nathanael Russell
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In a Queen's Gambit theme, if you could play a chess engine configured to equal your playing strength, which variation would you choose for the Black pieces?

Original source - https://en.wikipedia.org/wiki/Queen's_Gambit

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General Concepts -

As Black's 2...dxc4 surrenders the centre, White will try to seize space in the centre and use it to launch an attack on Black's position. Black's game is not devoid of counterchances, however. If the white centre can be held at bay, Black will try to weaken White's centre pawns to gain an advantage in the ensuing endgame by playing ...c5 and ...cxd4 at some stage, and if White responds with exd4, the result will be an isolated pawn on d4 – which can also lead to a keen middlegame battle. If White recaptures with a piece at d4 instead, the centre will be liquidated and a fairly even game will usually ensue.

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General Concepts -

Playing 2...e6 releases Black's dark-squared bishop, while obstructing his light-squared bishop. By declining White's temporary pawn sacrifice, Black erects a solid position; the pawns on d5 and e6 give Black a foothold in the center. The Queen's Gambit Declined has the reputation of being one of Black's most reliable defenses to 1.d4. In this situation, White will try to exploit the passivity of Black's light-squared bishop, and Black will try to release it, trade it, or prove that, while passive, the bishop has a useful defensive role.

An eventual ...dxc4 by Black will surrender the center to White, and Black will usually not do this unless he can extract a concession, usually in the form of gaining a tempo, by capturing on c4 only after White has played Bd3 first. In the Orthodox Line, the fight for the tempo revolves around White's efforts to play all other useful developing moves prior to playing Bd3.

Re: Queen's Gambit Accepted or Declined?

Posted: Sun Oct 04, 2015 12:03 am
by Ferdy
Complexity generator uci interface with sf6 as engine. Mutipv 5 was first run at 180s, folllowed by complexity calculation of each move at given time in sec from the line below.
Move e6 is best according to score, but Nc6 is the more complex one.

[d]rnbqkbnr/ppp1pppp/8/3p4/2PP4/8/PP2PPPP/RNBQKBNR b KQkq c3 0 2

Code: Select all

UEI v3.0 [Stockfish 6 64 POPCNT]:
-0.21/23  79.3s 2...e6 3.Nf3 Be7 4.Nc3 Nf6 5.Bg5 Nbd7 6.cxd5 exd5 7.e3 O-O {complexity 57}
-0.22/23  91.4s 2...Nf6 3.cxd5 c6 4.Nc3 cxd5 5.Bf4 Qb6 6.e3 Bf5 7.Bb5+ Nc6 {complexity 9}
-0.28/23  91.4s 2...c6 3.cxd5 cxd5 4.Nc3 Nc6 5.Bf4 Bf5 6.e3 e6 7.Nf3 Bb4 {complexity 49}
-0.44/23 106.6s 2...e5 3.dxe5 d4 4.Nf3 Nc6 5.a3 Nge7 6.b4 Ng6 7.Bb2 Be7 {complexity 0}
-0.44/23 106.6s 2...Nc6 3.Nf3 e6 4.e3 Nf6 5.a3 Be7 6.Bd3 dxc4 7.Bxc4 e5 {complexity 133}

Re: Queen's Gambit Accepted or Declined?

Posted: Sun Oct 04, 2015 7:18 am
by AdminX
I like playing the QGA as black, as it is off the beaten path. I also have seen quite a few game nice games played by GM Alexander Morozevich with the black pieces. :D