Author: Dirk Frickenschmidt
Date: 05:10:31 10/27/98
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On October 26, 1998 at 12:11:00, Moritz Berger wrote: Hi Moritz, this seems to show that even with much time these (and probably other programs) fail to see enough compensation for black's exchange sacrifice. Fischer - and of course even the cautious Petrosian - (and probably other humans) judged it just the other way round. I am too curious to see some of the reasons why. Is it only recognizable after more than 7-8 moves? And which are the critical lines? Thanks to those in this thread who already offered some of the possibly most important ones. Kind regards from Dirk >On October 25, 1998 at 14:45:58, Dirk Frickenschmidt wrote: > >>While looking over some Fischer games again, I found an interesting position: >> >>Fischer,R (2760) - Petrosian,T (2640) [B42] >>Buenos Aires cf Buenos Aires (7), 1971 > >>Now my question is: What is wrong about playing Bb5+ in this position, like most >>or all programs probably would? > >Since my machines had nothing better to do overnight, I gave Rebel 10 and Junior >5 this position to chew (Rebel 10 regular analysis level, J5 both infinite >analysis and 2-best-analysis). > >Moritz ¤º°`°º¤ø,¸¸,ø¤º°`°º¤ø¤º°`°º¤ø,¸¸,ø¤º°`°º¤øø¤º°`°º¤¤º°`°º¤ø,¸¸ > >Rebel 10 PII-450 120 MB hash: > >00:04:43 13.00 1.16 Bd3-b5 a6xb5 Qa4xa8 0-0 Qa8-a5 b5-b4 Nc3-b5 >00:12:43 14.00 1.19 Bd3-b5 a6xb5 Qa4xa8 0-0 Qa8-a5 b5-b4 Nc3-b5 >00:54:32 15.00 1.16 Bd3-b5 a6xb5 Qa4xa8 0-0 Qa8-a5 b5-b4 Nc3-b5 >05:00:09 16.00 1.20 Bd3-b5 a6xb5 Qa4xa8 0-0 Qa8-a5 b5-b4 Nc3-b5 > >(stopped after 10.5h, >1.000.000.000 nodes) > >Fischer,R - Petrosian,T >r1b1k2r/3qbppp/p4n2/3p4/Q7/2NB4/PP3PPP/R1B2RK1 w kq - 0 1 > >Analysis by Junior 5.0 PII-450 128MB hash: > >13.Bb5 axb5 14.Qxa8 > +- (2.01) depth: 3 00:00:00 0kN >13.Bb5 axb5 14.Qxa8 b4 15.Nb5 Qg4 > +- (1.70) depth: 6 00:00:00 3kN >13.Bb5 axb5 14.Qxa8 b4 15.Nb5 Qg4 > +- (1.70) depth: 6 00:00:00 5kN >13.Bb5 axb5 > ± (1.40) depth: 9 00:00:00 38kN >13.Bb5 axb5 > ± (1.40) depth: 9 00:00:01 65kN >13.Bb5 axb5 14.Qxa8 b4 15.Na4 0-0 16.Nb6 Qb7 17.Qxb7 Bxb7 18.Rd1 > ± (1.33) depth: 12 00:00:02 523kN >13.Bb5 axb5 14.Qxa8 b4 15.Na4 0-0 16.Nb6 Qb7 17.Qxb7 Bxb7 18.Rd1 > ± (1.33) depth: 12 00:00:03 968kN >13.Bb5 axb5 14.Qxa8 b4 15.Na4 0-0 16.Nb6 Qe6 17.Be3 Bd7 18.Qa5 Re8 19.Nxd7 Nxd7 > ± (1.27) depth: 15 00:00:16 5206kN >13.Bb5 axb5 14.Qxa8 b4 15.Na4 0-0 16.Nb6 Qe6 17.Be3 Bd7 18.Qa5 Re8 19.Nxd7 Nxd7 > ± (1.27) depth: 15 00:00:31 9488kN >13.Bb5 axb5 14.Qxa8 0-0 15.Rd1 Bb7 16.Qa5 b4 17.Ne2 Ra8 18.Qb6 Ra6 19.Qd4 Qg4 >20.f3 Qg6 > ± (1.09) depth: 17 00:01:10 22775kN >13.Bb5 axb5 14.Qxa8 0-0 15.Rd1 Bb7 16.Qa5 b4 17.Ne2 Ra8 18.Qb6 Ra6 19.Qd4 Qg4 >20.f3 Qg6 > ± (1.09) depth: 17 00:02:34 47828kN >13.Bb5 axb5 14.Qxa8 0-0 15.Rd1 Bb7 16.Qa5 b4 17.Ne2 Ra8 18.Qb6 Ra6 19.Qd4 Qg4 >20.Qxg4 Nxg4 21.Bd2 > ± (1.06) depth: 18 00:03:37 68072kN >13.Bb5 axb5 14.Qxa8 0-0 15.Rd1 Bb7 16.Qa5 b4 17.Ne2 Ra8 18.Qb6 Ra6 19.Qd4 Qg4 >20.Qxg4 Nxg4 21.Bd2 > ± (1.06) depth: 18 00:06:49 124582kN >13.Bb5 axb5 14.Qxa8 b4 15.Na4 0-0 16.Nb6 Qf5 17.a4 bxa3 18.bxa3 Bc5 19.Na4 Bd7 >20.Qa5 Bd6 21.Re1 > ± (1.12) depth: 19 00:09:48 184240kN >13.Bb5 axb5 14.Qxa8 b4 15.Na4 0-0 16.Nb6 Qf5 17.a4 bxa3 18.bxa3 Bc5 19.Na4 Bd7 >20.Qa5 Bd6 21.Re1 > ± (1.12) depth: 19 00:16:06 295472kN >13.Bb5 axb5 14.Qxa8 0-0 15.Qa5 b4 16.Ne2 Re8 17.Be3 Bd6 18.Rad1 Qc7 19.Qxc7 Bxc7 > ± (1.10) depth: 20 00:21:15 392691kN >13.Bb5 axb5 14.Qxa8 0-0 15.Qa5 b4 16.Ne2 Re8 17.Be3 Bd6 18.Rad1 Qc7 19.Qxc7 Bxc7 > ± (1.10) depth: 20 00:37:28 692193kN >13.Bb5 axb5 14.Qxa8 0-0 15.Qa5 b4 16.Ne2 Re8 17.Re1 d4 18.Bd2 d3 19.Nf4 Qd4 >20.Rad1 > ± (1.06) depth: 21 00:47:00 870370kN >13.Bb5 axb5 14.Qxa8 0-0 15.Qa5 b4 16.Ne2 Re8 17.Re1 d4 18.Bd2 d3 19.Nf4 Qd4 >20.Rad1 > ± (1.06) depth: 21 01:24:22 1584526kN >13.Bb5 axb5 14.Qxa8 0-0 15.Qa5 b4 16.Ne2 d4 17.Bd2 Re8 18.Rae1 d3 19.Nf4 Qd4 >20.Qa8 > ± (1.12) depth: 22 01:46:08 1995698kN >13.Bb5 axb5 14.Qxa8 0-0 15.Qa5 b4 16.Ne2 d4 17.Bd2 Re8 18.Rae1 d3 19.Nf4 Qd4 >20.Qa8 > ± (1.12) depth: 22 03:05:05 3530468kN >13.Bb5 axb5 14.Qxa8 0-0 15.Qa5 b4 16.Ne2 Re8 17.Be3 Bd6 18.Rad1 Bc7 19.Qxb4 Ng4 >20.Nf4 Nxe3 21.fxe3 > ± (1.16) depth: 23 03:54:49 195257kN > > >Analysis by Junior 5.0 (depth 20, 2-best-mode) PII-450 128MB hash: > >± (1.10): 13.Bb5 axb5 14.Qxa8 0-0 15.Qa5 b4 16.Ne2 Re8 17.Be3 Bd6 18.Rad1 Qc7 >19.Qxc7 Bxc7 >² (0.46): 13.Re1 Qxa4 14.Nxa4 Be6 15.Be3 a5 16.Bb5+ Kf8 17.Rac1 Rc8 18.Rxc8+ >Bxc8 19.Bb6 Bb4 20.Nc3
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