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Monday, November 21, 2011

Security of the KIng's Bunker.

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Pawns at their original positions are considered to cover the king best, as they protect all neighbouring squares, which makes it more difficult for the attacker to exchange pawns and break open files for his rooks.

Threat of Back Rank Weakness :

However the arangement of pawns in a line also has its drawbacks, e.g. it is frequently necessary to take into account checkmate threats through back rank weakness.

Any advance of these pawns useally weak the castling positio, and since the pawns cannot move back, this weakness is irreparable and long lasting. Take a look at the following diagram,

The advantage of this structure consists of the fact the king has an empty h2 square to escape to a so-called hole and safe oneself in case of back rank weakness.
However, the structure has some disadvantages. The h3-pawn is a good target for tactical blows. The attacker can sacrify the piece to destroy the kings bunker.

Advance with g-pawn :

When you make a move with the g-pawn , there arises a pawn arrangement similar to the wedge. Such an advance can be both voluntary and forces. In both cases it results in a significant weakening of the f3- and h3-squares. Also, the diagonal a8-h1 and f1-h3.

However there is a fianchetto bishop on g2-square protecting the weakness, the castling position usually is quite safe. The opponent always try to exchange this piece.

Advance with f-pawn :

The f-pawn is pushed ahead no less often. In this case the g1-a7 diagonal and especialy the e2-square are weakened. Besides the pawn on f3 occupies the square which is more suitable for knight.

At the same time the placement of the pawn on f3 is a positive factor in the endgame, as it allows the king to reach the cnetre quicker.

There are situations when two pawns are advance f3 and h3. then the whole complex of squares near this king is weak. In those cases attacks along the a7-g1 and b8-h2 diagonals are especially dangerous.

Besides there is a 'hole' on the g3-square which frequently is a very convenient outpost for the opponent attacking pieces.

The pawn cover of the king can include double pawns. Which can be both rather strong and hopelessly weak

1. The doubled pawns provides a rather reliable barrier for the king. But these barriers also have their weakness.

a) When h2 pawn moves to g3-square, it weakens the H-file.

b) when f2 pawn moves to g3-squares it weakens the a7-g1 diagonal.

Doubled Isolated Pawns : The doubled isolated pawns arising after an exchange on the squares f3 or h3 are especially unpleasant for the defensive side. Such pawn are not only weak in themselve but in addition expose the g-file, the a8-h1 diagonal and the f3-square respectively the g-file and the h3- square.

2. Finally the kings pawns can also looks like a chain. such cover is considered to be very weakened too, as the a8-h1, a7-g1 and h3-f1 diagonals are easily accesible for the oponents pieces.

In both cases advanced pawns can be easily attacked by the opposite sides. On the top of that the position in the left diagram has the weakened 2nd rank.