Author: Ernst A. Heinz
Date: 04:42:13 01/20/98
Go up one level in this thread
On January 19, 1998 at 18:42:00, Amir Ban wrote:
>No. 112 (Qc6):
>
>This one's correct, and also difficult and subtle. Black is a piece up
>but what to do about the threat of perpetual Ng5+ ? Qc6 throws a piece
>and gets it back like this: Qc6 Qxe5 Bb7 Re1 Kh8!! Amazing.
>
>Recommend: No change.
Yes.
>No. 115 (Nxh7):
>
>Correct and difficult.
>
>Recommend: No change.
Yes, this position is quite difficult -- and it is also prone to
"right" answers for the wrong reasons ...
Initially, "DarkThought" thinks Nxh7 is a draw by perpetual check.
Thence,
it prefers O-O with a positive score of +0.25 until iteration #12 where
it
detects that Nxh7 is much better and not a draw at all!
Going for Nxh7 with a draw score seems to be wrong in this position --
at
least I would be alarmed if "DarkThought" did it.
>No. 117 (Ne7+):
>
>The key move is a 1-ply combination, but Ra7 is much stronger and neat.
>
>Recommend: Change key to Ra7.
"DarkThought" agrees.
>No. 123 (Nxd6):
>
>The key move is not really satisfactory, I think. Stronger is Bxe5. If
>dxe5 Nh4 and if Rxe5 Nd7 both win a piece.
>
>Recommend: Change key to Bxe5.
"DarkThought" agrees.
>No. 130 (Rxe7):
>
>I nearly wrote off this one as incorrect, but it works: Rxe7 Qxe7 Qf3
>Kg7 Nce4 dxe4 Nxe4 Qe6 Bxf6+ Kg8 Qf4! wins. Should be quite difficult.
>
>Recommend: No change.
"DarkThought" does not find Rxe7 in 20 min.
>No. 131 (c5):
>
>I get g4 Bg6 c5 etc. It looks like a transposition since after c5 Nxd5
>white should play g4 immediately or the next move.
>
>Recommend: Add g4 as side solution.
"DarkThought" agrees (yet it locks on to c5 in iteration #8). But the
score is not convincing -- do all other moves lose in this position?
>
>No. 133 (Rxe4):
>
>Seems correct, though the score is unconvincing.
>
>Recommend: No change. More analysis please.
"DarkThought" finds Rxe4 in 5 sec with a score climbing to +1.2
in iteration #14.
PV = 1. Rxe4 dxe4 2. Nxe4 Qe1+ 3. Kh2 Qxc1 4. Nf6+ Kh8 5. Nxe8 ...
>No. 137 (c6):
>
>c6 doesn't look like it really works. Anyway I get Qe2 which is more
>convincing.
>
>Recommend: Change key to Qe2.
"DarkThought" locks onto Rc3 in iteration #10 and thinks it is
really crushing (score > +6 in iteration #15).
PV = 1.. Rc3 2. h3 Qe2 3. Qd5 Rc2 4. Bd2 Rxd2 ...
Maybe, Qe2 and Rc3 are just transpositions ("DarkThought" prefers
Qe2 until iteration #10)?
>No. 142 (d3+):
>
>I don't see the point to the key. d3+ Kh1 and then what ? I tried Qa1
>and Qf2 but they fail.
>
>Recommend: Get rid of it.
"DarkThought" locks onto d3+ in iteration #11 with a score creeping up
to +1.6 in iteration #14.
PV = 1.. d3+ 2. Kh1 Qf2 3. Rd1 Qc2 ...
>No. 145 (Bd4+):
>
>Bd4+ does something, but is a waste of energy. I find Rf2! an original
>way to guard the rook which incidentally wins a piece.
>
>Recommend: Change key to Rf2.
"DarkThought" agrees that Rf2 is crushing (score > +5 in iteration #13).
>No. 148 (Rfc8):
>
>I think it's correct, but I need a stronger machine for this than this
>notebook. At long analysis I find only Nxf4 for a draw score, but a long
>analysis of Rfc8 starts showing plus scores.
>
>Recommend: Needs more analysis.
"DarkThought" locks onto Rfc8 in iteration #8 and gets a fail-high on it
in iteration #11 (score +0.9).
PV = 1.. Rfc8 2. fxe5 Nf4 3. Rge1 Rxc2+ 4. Qxc2 Qe3+ 5. Rd2 Rxc2+ 6.
Kxc2 ...
=Ernst=
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