Author: Uri Blass
Date: 16:14:14 10/21/00
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On October 21, 2000 at 18:57:17, Chessfun wrote: >On October 21, 2000 at 18:37:53, Chessfun wrote: > >>On October 21, 2000 at 18:29:39, Uri Blass wrote: >>>>[D]rnbqkbnr/pp3ppp/2p5/8/2ppP3/2N2N2/PP3PPP/R1BQKB1R w KQkq - 0 1 >>> >>> >>>I see the tigers cannot find Bxc4. >>>This can be result of one of the following reasons: >>> >>>1)They do not search deep enough to see it >>>2)They have the right evaluation to tell them not to play it. >>> >>>My experience with chess programs tells me that in the cases when programs do >>>not find Bxc4 it is because of reason 1 >>> >> >> >>>I checked it by giving them the position after Bxc4 dxc3 Qxd8+ Kxd8 and I found >>>that they see a clear advantage for white. >> >>You checked? who is they?. >> >>Sarah. > > >I think in this case maybe 1) is closer to the truth > >Assuming you mean Junior 5.9 or another program. >I see no advantage for white in the line; >Ne5 Be6 Bxe6 fxe6 Nf7+ Ke8 Nxh8 g6 b3 Bg7 Nxg6 hxg > >Please post the line with clear advantage? > >Sarah. 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. 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. 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. Uri
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