From: Colin Paul Adams COLINA DEMON CO 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