RE: [computer-go] alpha-beta + graph history question

[Dave Dyer <ddyer@xxxxxxxxxxx>]

One way this assertion could be violated is due to subtle instability
in floating point calculations.   Usually (but not necessarily) that
would be manifest by the assertion failing only by a very small amount,
but under optimum conditions, the disparity could be arbitrarily large.
Briefly, in the real world, floating point calculations are neither
communitive or associative, only approximately so.  There is no cure
for this except to ALWAYS use fixed point.

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