In search for the siblings of invasion
Let's see whether we can discover some brothers and sisters. Let's first make some invisible things visible.
 |
| White to move |
8/k7/2p5/2p2K2/p1P5/P7/8/8 b - - 0 1
The battle of the opposition is carried out along the 6th rank. White can move over the whole board, but as soon as he steps somewhere on the 6th rank, black must step on the 6th rank too. What is more, the black king must step on the same color as the white king. This means that the black king must stay in contact with b6 and a6. This means that his range is limited to b7 and a7.
 |
| White to move |
While the white king moves around in the opposition zone of h6 - d8 (red circles), the black king maintains the (distant) opposition while moving over the blue circles. The actual battle is over the frontier c6-c7-c8. It starts with taking the opposition when white enters the opposition zone.
The correspondent squares would look something like this:
 |
| White to move |
UPDATE
Adding some experimental nomenclature:
Opposition zone = red circles
Patrol zone = blue circles
Frontier = c6-c7-c8
Key squares = frontier
Free zone = rank 1-5
Attacking square = d7
The invasion element is that white threatens two enter two key squares (c6 and c8) from the attacking square. It is a double attack.
Defensive square = b7
UPDATE in blue.
ReplyDeleteThe invasion theme always has an attack on two fronts in it. Being it a double attack, or with a bigger space in between. This means that FUNction is closely related to it. You bind defenders to invasion squares, thus making them less mobile.
ReplyDeleteThere are no moves that are invasion-less. If you play them anyway, you deserve to lose.
The difference between a developed piece and a non developed piece is measured by the invasion squares they potentially attack. Together with the importance of those invasion squares.