TimS wrote on 02/06/06 at 11:30:10:
[quote author=TalJechin link=1077692552/45#49 date=1139223301]
What I find interesting is that Theory generally considers the Berlin endgame to be slightly advantageous for White despite the pawn on e5, whereas the Exchange endgame is supposed to be equal even though the pawn is on e4. Surely something is wrong here?
A good question.
In both lines, with only the queens and one minor piece each exchanged, it could be argued that we are still in a queenless middlegame, in which therefore some middlegame themes still apply.
After 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4 it is Black to move, so he is only the usual one half-move behind in development and, being able to castle, is able to connect his rooks and coordinate his forces rather quickly and easily.
But after 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.0–0 Nxe4 5.d4 Nd6 6.Bxc6 dxc6 7.dxe5 Nf5 8.Qxd8+ Kxd8 it is White to move, so White is two tempi ahead in development. In addition, Black finds it difficult to coordinate his forces and connect his rooks, since he cannot castle. Also the Nf5 is not ideally placed and often needs to move again. Finally Black often needs to consume more time with ...h6 to control g5 and protect his bishop pair from harassment. IMHO compared with the Exchange Variation, in the Berlin Wall it takes a strong player to be able to coordinate Black's forces and make good use of the bishop pair
PS Isn't it interesting how chess theory is so often cyclical? Tarrasch and Pillsbury both played and thought highly of the Berlin Wall. For instance, in Tarrasch's "The Game of Chess" he wrote after Black's 8th move: "The play has brought about an end-game in which the chances are approximately equal. White's king's pawn is not well placed, and Black's two bishops ensure him a good game."