From: Colin Paul Adams <colin <at> COLINA <dot> DEMON <dot> CO <dot> UK>
Date: 3 feb 2000
Subject: Further correction to A4

Hm.

No doubt you've already seen that the final position isn't mate.

I should have added:

8. ..., K - 12c
9. +FL - 10e (mate in 17)

It appears my program still has some bugs in the mating mode. If I set
the search depth to 16, then it says no mate found after 16 moves
(correct!). But if I set the search depth to 18, then it declares a
mate in 15 (missing off the last two moves). And in one of the
sidelines, is was getting the principal continuation wrong several
moves down the line.

This would seem to be a bug in reporting the moves, rather than in the
actual analysis (I suspect transpositions are causing the reporting
errors - maybe I should try suppressing transpositions in Mating mode).
--
Colin Paul Adams
Preston Lancashire