From: Colin Paul Adams <colin <at> COLINA <dot> DEMON <dot> CO <dot> UK>
Date: 3 feb 2000
Subject: CHU: revised solution to A7

Once again, the computer doesn't exactly agree with the published
solutions.

First, the principal continuation that the computer found (in 32
minutes) was:

1. +DH x 11d, K - 12a
2. +VM - 7f,  +DK x 7f
3. FK x 7f,   GB - 9d
4. FK x 9d,   K - 12b
5. Ln x 10d,  +L x 10d
6. FK - 12g,  B - 12d
7. +DH x 12d, K - 12a
8. +DH - 11c, +L - 12f
(until that move, the computer had been following the alternative
solution, which gave Ln - 12b or 12c as a defence, but that lead to an
immediate choice of mates)
9. FK x 12f,  Ln - 12b
10. FK x 12b Mate (in 19, as opposed to 17 with the inferior defence)

As for the defence of 3. ..., SM - 10c, this leads to mate in a
further 9 moves (just as in the published primary solution), which is
mate in 15 moves in total.

So no real surprises here, just an improved defence.
--
Colin Paul Adams
Preston Lancashire