Author: Kurt Utzinger
Date: 22:45:53 08/28/04
Go up one level in this thread
On August 28, 2004 at 18:40:43, martin fierz wrote:
>aloha!
>
>after all the cloning talk, here's something to test your favorite engine with:
>i played a weakish IM today and got the following position after 56...Qg6+
>57.Kf2:
>
>[D] 8/6kp/8/3p4/1P4q1/P4p2/5K2/4Q3 b - - 0 57
>
>it took me a couple of seconds to see that after 57...Qh4+ 58. Kf1 Qxe1+ 59.
>Kxe1 Kf6 black is completely winning due to the floating square (it's nice to
>see that reading dvoretzky is some good!) and so i played that and won :-)
>
>interestingly, when i entered this game in chessbase running fritz7 in the
>background, fritz didn't seem to see this at all within a minute or so. so
>question to all: how long does your favorite engine need to see the line ...Qh4+
>Kf1 Qxe1+ with a HUGE plus score (i.e. +9 or so - that is what my assessment of
>the position was after a couple of seconds...)?
>
>i don't want to claim that this is the only win, but it is by far the easiest
>one, and fritz 7 misses it completely.
>
>cheers
> martin
Hi Martin
A most interesting position showing the difference
of thinking between human and machine. You "know"
that the exchange of queens is an easy win, the
engines have no idea. But there is one important
thing to consider here: for computers 57...Qg2
wins too and this line may be the reason that
the engines can't find the more human like 57...Qh4
58.Kf2 Qxe1 within reasonable time. I have tested
Hiarcs 9 and something typical happened: at blitz
level the engine would play "correctly" and even
up to depth 11/14 Hiarcs9 does not change its mind
with a score of -5.14 against white. But then the
program looked more deeply at 57...Qg2 and at
depth 11/36 and a score of -5.15 (!!) jumps over
to 57...Qg2. It's somehow a pity that this end
game position allows two different and easy wins.
Kurt [http://www.utzingerk.com]
New game
8/6kp/8/3p4/1P4q1/P4p2/5K2/4Q3 b - - 0 1
Analysis by Hiarcs 9:
57...Kf6 58.Qc3+ Ke6
µ (-0.96) Depth: 1/7 00:00:00
57...Qg2+ 58.Ke3 Qe2+ 59.Qxe2
µ (-1.07) Depth: 1/9 00:00:00
-+ (-4.30) Depth: 1/9 00:00:00
57...Qh4+ 58.Kf1 Qxe1+ 59.Kxe1 Kf7 60.a4 Ke7 61.b5 Kd6 62.a5 d4 63.Kf2 Kc5 64.b6
Kc6 65.Kxf3
-+ (-6.55) Depth: 1/9 00:00:00
-+ (-5.14) Depth: 11/34 00:01:06 14627kN, tb=1808
57...Qg2+ 58.Ke3 Kf8 59.Qb1 Qe2+ 60.Kd4 Qd2+ 61.Kc5 Qf4 62.Qxh7 f2 63.Qh8+ Ke7
64.Qh7+ Ke8 65.Qg6+ Kf8 66.Qd3 f1Q 67.Qxd5 Ke7
-+ (-5.15) Depth: 11/36 00:01:50 23515kN, tb=3118
-+ (-7.24) Depth: 13/39 00:08:12 104165kN, tb=20325
(Utzinger, MyTown 29.08.2004)
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