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Subject: Re: ECM errata

Author: Ernst A. Heinz

Date: 08:29:12 01/19/98

Go up one level in this thread


On January 18, 1998 at 16:41:30, Amir Ban wrote:

>No. 51 (Rxh2):
>
>Was not solved in 20 seconds, but turned out in the deeper think, but
>with an unconvincing score. I didn't analyze it.
>
>Recommend: No change (but someone else should look at it).

"DarkThought" gets a fail-high on Rxh2 in iteration #14.

>No. 60 (Bxh2+):
>
>This one looks wrong. Junior has Qh6 which seems winning (Nf3 Nd2!).
>Looks much more convincing than Bxh2+, where I don't see a win.
>
>Recommend: Change solution to Qh6.

"DarkThought" agrees (score = +1.6).

>No. 63 (Ncxd5):
>
>Junior has Nbxd5, and this looks like a simple transpostion.
>
>Recommend: Add Nbxd5 as side solution.

"DarkThought" agrees.

>No. 68 (Bd3):
>
>I don't understand the key move. Bd3 Qxc3 Rg4 Qxa1 Bxa1 Nxg4 Qxg4 g6
>looks like just a creative way to lose material. I don't see anything
>else here.
>
>Recommend: Drop this problem.

"DarkThought" agrees.

>No. 71 (Qh6):
>
>Qh6 leads to material gain, and Junior finds it quickly, but after a few
>seconds insists on the quiet and subtle Kg2! Black loses a rook at
>least.
>
>Recommend: Change solution to Kg2.

"DarkThought" agrees.

>No. 76 (fxg6):
>
>Junior switches to fxe6 and sticks with it. Analyzing both options, the
>key is correct but fxe6 is at least as good.
>
>Recommend: Add fxe6 as side solution.

"DarkThought" agrees.

>No. 78 (Nxc5):
>
>Was not found in 20 seconds, but turns up convincingly later.
>
>Recommend: No change.

Found in 10 sec.

>No. 81 (Qb1+):
>
>Junior takes Bxc6, with idea Bxc6 Qd8 Qb1+. The idea of the key Qb1+ is
>that the white queen is lost on a8 because of mate threats. Junior's
>side solution uses the same idea, showing that the queen is equally lost
>on d8 ! A nice cook.
>
>Recommend: Add Bxc6 as side solution.

"DarkThought" agrees on Bxc6 (score = +1.23) but simply e6 may be
equally
good. Actually, I would drop the position.

>No. 82 (exf6):
>
>Not found in 20 seconds, but turns up later.
>
>Recommend: No change.

Found exactly after 20 sec.

>No. 84 (Bg6):
>
>Junior plays the unspectacular cxb5. The key Bg6 looks sound, but it
>only forces the exchange of heavy pieces and leads to an endgame with
>advantage.
>
>Recommend: No change, or drop it on grounds of vagueness.

"DarkThought" agrees -- I would drop the position.

>No. 91 (Nc6):
>
>Junior switches between Nc6 and Nxe6. It finally adopts Nc6, but Nxe6
>may not be far behind.
>
>Recommend: No change.

"DarkThought" likes both Bf4 and Nc6 and finally locks on Nc6 in
iteration #12 with a score of +1.13. But as Bf4 and maybe also Nxe6
do not seem to be far behind I would drop this position, too.

>No. 96 (Qe8+):
>
>This one's correct and is mate in 5, but so is Nf6+ with a different
>move order.
>
>Recommend: Add Nf6+ as side solution.

Yes.

=Ernst=



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