Lessons From Bischofsgrün VI & VII

IN round six I was White against Dieter Bauer (1787), and in round seven I was Black against Manfred Herbold (2075).

The openings were very different - an English and a Sicilian Grand Prix Attack - but there was something similar about Black's position in both games after 10 moves.

Black has just captured on c4 in the English game

Black has just pushed the e pawn in the Sicilian game

In the English game, Black has one developed piece, a knight, against White's three - a bishop and two knights.

In the Sicilian game, Black has one developed piece, a bishop, against White's, arguably, four - both rooks and both knights, and White has castled.

In both games it is White to move, so Black's lack of development is even starker.

But there is a huge difference in how Stockfish18 and Dragon1 evaluate the positions.

In the first diagram, White is winning, according to the engines, after the game's 11.0-0, and after 11.Nxc6!

In the second diagram, again according to the engines, White has the normal slight edge one associates with moving first.

Why the difference, especially in view of the discrepancy in development being greater in the second diagram, and White having a doubled and vulnerable pawn in the first diagram?

The answer is that in the first diagram, lines have been opened in the centre, which makes it easier for pieces to attack the opponent's position in general, and the opponent's king in particular.

In the second diagram, while the centre is not closed, it is definitely not open either, with both sides having eight connected pawns, and none in contact with enemy pawns.

LESSON: the importance of development increases dramatically as lines are opened.