Date: Fri, 20 Oct 95 18:20:09 +0000 (GMT)
From: Wei-Hwa Huang <whuang@cco.caltech.edu >

"Jerry Bryan" <BRYAN@wvnvm.wvnet.edu> writes:
>Finally, here is my question. On the 4x4x4, I get "bad parity" darn
>near every time. Why isn't it 50-50 like the situation I have with
>flips on the 3x3x3?

My suspicion is that "bad" or "good" parity is determined by what your
formulae are composed of. An even number of center-plane moves will
preserve parity, and the opposite is true for odd center-plane moves.

If there really is a reason you're getting bad parity moves, that could
determine it.

However, I ran into a straight of 5 "good parity" situations recently,
and didn't really notice it until later, so perhaps it's a psychological
phenomenon as well (we gloss over good happenings, and dwell on tragedies.)

```--
int m,u,e=0;float l,_,I;main() {for(;e<1863; putchar((++e>924&&952>
e?60-m:u) ["\n  ude.hcetlac.occ@gnauhw   ]"])) for(u=_=l=0;(m=e%81)
<80&&I*l+_*_ <6&&25>++u;_=2*l*_+e/81*.09-1,l=I)I=l*l-_*_-2+.035*m;}
```