Further theory of ecto-battery
On the announcement page of 28th TT CCM there is a short outline of ecto-battery. While the
"normal" cases are easy to understand, naturally there are many fringe cases using various fairy elements.
That is why a few interested composers have asked for clarifications, whether some specific cases are ecto-battery
or are not.
Let's give first the definition of battery:
The battery is a configuration of two pieces A (front), B (rear) and square X
initially not attacked by B along some line*. The departure of piece A from its square activates
piece B to square X, without specific needs
for activity of A. (In orthodox chess, A stands on the line in question between B and X.)
Now the anti-battery:
The anti-battery is a configuration of two pieces A (hurdle), B (rear - jumping piece) and square X
initially not attacked by B along some line*. The arrival of
piece A on specific square activates piece B to square X, without
specific need for activity of A. (In a case B is grasshopper, A arrives on the line
between B and X, next to X.)
And finally the ecto-battery:
The ecto-battery is a configuration of two pieces A (moving), B (rear) and square X
initially not attacked by B along some line*. The move of piece A activates piece B to square X, without
specific need for activity of A and without departing from nor arriving to line in question.
* - It is important to realize, that the line in question is not necessarily usual straight line, horizontal,
vertical, diagonal etc. It is understood in the loose sense, it might be curved line, e.g. of a rose,
or more complicated fairy line as you can imagine, e.g. capture by white Pe3 on d4 in Anticirce is played
along the unusual line e3-d4-d2.
So now I will give a few example with explanations as I do understand the ecto-battery. It is by no means a
final word on this subject, rather the current status - how the judge probably will be considering the entries.
I would be happy if any more experienced theoretician would build more precise theory.
Also, so far I have seen the following fairy elements used for showing ecto-battery:
locust (and its relatives, including marine pieces),
Anticirce (almost the whole family of Anticirces, to be precise),
Kamikaze (with convention that the move of capturing piece continues and ends out of board,
just like "raus" move in Dynamo Chess),
hopping pieces + Circe (with rebirth on that way activated hopper line),
Take&Make (by some experts
considered to be a kind of Anticirce, but usually not treated as such).
My thanks go to Dmitry Turevski, Gilles Regniers and Manfred Rittirsch for providing some positions and
food for thought.
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