Author: Paulo Soares
Date: 17:34:33 10/21/00
Go up one level in this thread
On October 21, 2000 at 19:26:23, Chessfun wrote: >On October 21, 2000 at 19:14:14, Uri Blass wrote: > >>White is losing in this line and has no advantage but programs have the illusion >>that white has advantage or at least equality and it pushes them to play the >>wrong Bxc4. >> >>Some programs do not play Bxc4 at tournament time control because the illusion >>is too deep for them to see it. >> >>The fact that tiger never considers Bxc4 as best may be a result of right >>evaluation or result of not seeing the illusion because it is too deep. > > >I think it is evaluation not as posted 1) but 2). > > >>My experience with chess programs tells me that the common case with programs is >>the case that the illusion is too deep for the programs to see. >> >>It can be proved by giving them the position before Ne5 and checking if they see >>positive evaluation. > > >Both Tiger's are negative before Ne5 and even forcing Bxc4 is a -1.00 >swing from what it wants to play. Which is why I say 2). > > >>Crafty17.11 does not see positive evaluation but it can see evaluation that is >>close to 0 and it may push it to play Bxc4(I do not know,I remember that an old >>version of Crafty could play the wrong Bxc4 after a long time). >>Hiarcs7.32 can see positive evaluation only to fail low later and the same for >>other programs. > >As I said Tiger and Gambit seeing it as a -1.00 swing they fail immediately >and it seems to me the reason is they know by evaluation or knowledge that Bxc4 >is wrong. > >Sarah. Rebel Tiger 12.e select Bxc4 in my PIII-450 HT=64Mb. I believe that most of the programs will select Bxc4 and later to discard it, like Uri wrote previously. Perhaps "new Tigers" also selects Bxc4 if you give more time. Paulo 00:00:00.6 0,02 7 41576 Qxd4 Qxd4 Nxd4 b5 Be3 a6 00:00:01.9 -0,18 8 101591 Qxd4 Qxd4 Nxd4 b5 Bf4 a6 Bxb8 Rxb8 Nxc6 00:00:01.1 -0,16 8 138166 Nxd4 00:00:02.4 -0,10 8 214796 Nxd4 b5 00:00:07.6 -0,06 9 707472 Nxd4 Nf6 e5 Qe7 Bxc4 Qxe5+ Be3 Ng4 Nf3 Nxe3 Nxe5 Nxd1 Rxd1 00:00:31.1 -0,12 10 3201260 Nxd4 b5 Bf4 Nd7 f3 00:00:31.2 -0,10 10 3278507 Qxd4 00:00:33.8 0,00 10 3398686 Qxd4 Qxd4 Nxd4 b5 Bf4 b4 00:00:48.7 -0,08 11 5132242 Qxd4 Qxd4 Nxd4 b5 Bf4 Bb7 e5 Nd7 00:01:41.1 0,00 12 11305699 Qxd4 Qxd4 Nxd4 b5 Be2 Nf6 0-0 00:03:34.2 0,00 13 24388883 Qxd4 Qxd4 Nxd4 b5 a4 b4 Nd1 Ba6 f3 c5 00:18:16.9 0,02 13 139595658 Bxc4
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