Author: Christophe Theron
Date: 12:12:28 12/23/00
Go up one level in this thread
On December 22, 2000 at 18:49:35, Thorsten Czub wrote:
>is sometimes different to the thesis you have in mind.
>but - lets see here...
>
>[d]2r1k2r/5pp1/4p3/ppqpP3/4bQPP/1B6/PPP2R1R/2K5 b k -
>
>>a4 ! is very strong (1...a4 2.Qf7 Kd8 3. Qxg7 Qe3+ -+) but Tiger (2 versions)
>>doesn't see this move
>
>>How do perform other engines here ?
>
>ok -
>i don't see why this is a selectivity problem.
>
>
>first new paradigm:
>
>Gandalf likes a4, from the first seconds, in the moment
>giving +2.68 in search 11.
>1...a4 2.Bc4 O-O 3.Bf1 a3 4.Qd2 axb2+ 5.Kxb2 Bxc2 6.Ka1
>
>CSTal 2.03 prefers Rc7 too and needs to come into search
>10 to see that 1...a4 is a "better" move.
>
>d10, 131s, c8c7 c2c3 a5a4 b3c2 e4c2 c1c2 a4a3 f4f3 a3b2
>d10, 318s, >+1.96 a5a4 f4f7
>d10, 391s, +2.23 a5a4 f4f7 e8d8 f7g7 c5e3 c1d1 e4f3
>
>now normal intelligent programs:
>
>hiarcs7.32 says -1.12 against white for 1...a4 and wants
>to play a4 very early. I have seen it preferring a4 after 15",
>i am not sure if earlier, but unimportant IMO.
>after 2'40" it increases this score to -1.37 in search 10/29
>against white with 1...a4 Bxd5 main line.
>
>diep:
>finds a4 too after a while
>
>stupid programs:
>
>junior6a likes a4 too. no problem for it.
>-1.22 against white after 26 seconds.
>
>fritz6a wants to play Rc7 and arround 15" changes to a4.
>later score says -1.47.
>
>
>so we learn: the key move is not found via score, it is mainly
>found by search.
>ok - at least gandalf finds it too early comparing its NPS-rate,
>
>the faster programs find the moves earlier. the slower ones
>slower.
>
>
>selectivity. hm. gambit-tiger gives a very high score for Rc7.
>arround 1.8 pawns. i only waited until search 13...
>3rd move in the main-line was : a4.
>
>i am looking forward to christophes answer.
>
>is tiger overseeing a4 due to a search-technique ?!
>
>:-))
It is true that Tiger is very selective, but I don't see why this would be a
problem in this position.
I think it is rather a matter of king attack evaluation, as Bob says.
But I did not check with a deep analysis...
Christophe
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