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Naccel 2 -- post #3

Posted By: Nack Ballard
Date: Tuesday, 12 January 2010, at 12:26 a.m.

In Response To: Naccel 2 -- post #3 (Ian Shaw)

Could you clarify the Symmetry in White's inner board, please? You seem to use the 1st man on the six point as part of the symmetrical pattern, while at the same time saying it counts zero because it's on S0. I can't see how it logically can count zero and also be used as part of a cluster, which implicitly makes it a contributor to part of a non-zero count.

This zero-count checker does indeed contribute to a non-zero count. However, its contribution is only as a visual aid; otherwise its existence is irrelevant.

The beauty of n0 (Naccel zero point, a.k.a. S0, or trad 6pt) checkers is that you can use them or not in a count, as convenient. Most of the time, it is best to remove/ignore all of them. But it can sometimes help to retain one or more, or even manufacture one (as, again, doing so does not alter the count. (Secrets of the modern universe: n0 is both a black hole and a white hole.)

Here, again, is White's near side position:
-2(+1)
 '1X2X '2X4X1X ' ' ' ' '

 ' ' ' ' ' ' ' ' ' ' ' '

As you know, you can remove the four n0 checkers without altering the count:
-2(+1)
 '1X2X '2X '1X ' ' ' ' '

 ' ' ' ' ' ' ' ' ' ' ' '


To get this position to a -2 count, you need to slide a checker one pip to the left. Any checker will do, except some formations are more easily recognizable than others. You chose to slide the far-left checker further to the left, like this:
-2
1X '2X '2X '1X ' ' ' ' '

 ' ' ' ' ' ' ' ' ' ' ' '


And that works fine: you have achieved a six-checker symmetry around n-2, for a -2 count.

There are two aspects to be aware of, however:

(1) The distance between the most polarized checkers of the formation is 6 pips; it is a little easier to spot symmetry when they are closer together.

(2) The bar buffers the n1 checker from the rest of the formation. That can be an impediment to perceiving symmetry clearly, especially on these diagrams where the bar is so wide (though, as with any counting system, bar distortion becomes much less noticeable as you practice with that system).

For those reasons, many people would find it easier/clearer to make this one-pip shift instead:
-2
 '1X2X '2X1X ' ' ' ' ' '

 ' ' ' ' ' ' ' ' ' ' ' '


This is also a six-sym around n-2 yielding a count of -2. Is it a problem that one of the checkers is on n0? No. That would be like saying that (-5 + 1) = -4, but that (-4 + 0) can't be quantified. (The analogy refers to it being okay to have n-5 and n1 checkers reflect around n-2 but somehow that it wouldn't be okay to have n-4 and n0 checkers reflect around n-2.)

If you like (having accounted for the 1-pip adjustment and working from the diagram above), you can remove the n0 checker, like this:
-2 +13 = -11
 '1X2X '2X ' ' ' ' ' ' '

 '2X '2X1X ' ' ' ' ' ' '


Since removing the n0 checker has no effect on the count, the count is still -2.

This five-checker formation happens to be a "tandem," because from White's perspective it looks like the top of a tandem bicycle with the blot being the handle bars and the points being the two riders. In this location and direction White's tandem counts -2.

I put another tandem (bicycle) on the side of the board facing us so that you can see it right-side up. Here, the tandem counts 13 (15 more than -2, because it is a five-checker squad three quadrants away). By an eerie coincidence, if you shift White's back checker points outward a pip, you get the 13-count formation that exists in Jim's original position.

But I'm just having fun now; complex squads will come much later, if you need/want to learn them at all. The main point is that the six-sym (shown in the previous diagram) is a basic count, whereas the tandem (shown here), even though it uses one fewer checker, is an advanced count. Hence, having that checker on S0 proves useful even though it contributes zero to the count.

Back to the original formation before the 1 pip was moved:
-2(+1)
 '1X2X '2X4X1X ' ' ' ' '

 ' ' ' ' ' ' ' ' ' ' ' '


In my explanation in "Naccel 2 -- post #3," rather than remove all four of the n0 checkers, "move" the n1 checker to n0, count the six-sym and finally count the pre-six-sym one-pip movement, I chose to remove only three of the n0 checkers, (leaving one where it was), count the six-sym, and then count the checker outside as 1 pip.

It comes to the same thing, except when possible I slightly prefer counting extra pip(s) in the outer board last rather than move them before the complete supe count has been obtained. (If you don't follow this part, it's okay -- it's an unimportant detail.)

Nack

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