Author: Eelco de Groot
Date: 16:29:46 10/05/04
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> >>Note only that singular extensions are not needed and better evaluation may be >>enough to find 43.e5 > >right again, probably speculative king safety eval makes a big difference here. > >but it may just be "by accident" that a program solves this position, simply >because it thinks that e5 is -3.1 while Bxb4 is -3.2. of course it is good to >realize that e5 is better than Bxb4, but still: the good test positions are >those where a program can only make the right move for the right reason. i'm not >saying this is a useless test position, but i think other positions are better >test positions. Chess Tiger 14.0 deep analysis about Ferret-Gandalf: 00:00:00.4 -1,02 9 54706 Bxb4 Nd4 Qe1 Qb2 Nc2 Nxc2 Bxc2 Rxb4 Rc3 00:00:00.9 -1,02 10 123526 Bxb4 Nd4 Qe1 Qb2 Nc2 Nxc2 Bxc2 Rxb4 Rc3 Rc8 Bd3 00:00:01.8 -1,58 11 244071 Bxb4 Nd4 Qe1 Qb2 Nc2 Nxc2 Bxc2 Rxb4 Qe2 Rc8 Bd3 Qd4 00:00:04.6 -1,58 12 670095 Bxb4 Nd4 Nc2 Nxc2 Bxc2 Qxd1+ Bxd1 Rxb4 e5 dxe5 Rc3 f6 Bc2 00:00:12.4 -1,84 13 1913841 Bxb4 Nd4 Qe1 Qb2 Nc2 Nxc2 Bxc2 Rxb4 c5 Rc4 Bd1 Rxc5 Kf1 00:00:33.3 -2,02 14 5284671 Bxb4 Nd4 Nc2 Nxc2 Bxc2 Qxd1+ Bxd1 Rxb4 Ra3 Rxc4 f3 Rc1 Rd3 f5 exf5 gxf5 g3 00:17:01.7 -2,92 15 171068700 Bxb4 02:43:30.0 -3,66 16 1646909652 Nf5 Ra7 Nh6+ Kg7 Nf5+ gxf5 Rg3+ Kf8 exf5 Rc7 f6 Rxc4 Qe1 Qe5 Qxe5 dxe5 Rg7 Rxh4 04:48:14.5 -3,08 16 -1353515571 e5 Qxa3 Rxf7 Kxf7 Qf3+ Kg8 Qf6 Qa1 Qxg6+ Kf8 Qf6+ Ke8 Nf5 Qxb1+ Kh2 Qxf5 Qxf5 05:03:16.8 -3,08 17 -1204117079 e5 Qxa3 Okay just pushing the defeat over the horizon then. But Ferret won, and the winner is always right > >besides, after looking at this again, i am not at all convinced that white has >anything in this position! after 43. e5 Qxa3 44. Rxf7 what exactly happens after >45...Qc1? black will exchange queens and i don't know how white is going to stop >that a-pawn. Chess Tiger 14 (Celeron 500 MHz, 24 Mb HT) agrees that Whites practical chances are very slim after 43. e5 Qxa3 44. Rxf7 Qc1, I assumed that is the line that you had in mind Martin?: [D]rr4k1/5R2/3p2p1/3PP2p/pnP4P/1n2N3/5PP1/1BqQ2K1 w - - 1 1 00:00:00.4 -2,74 7 57462 Qxc1 Nxc1 Rf6 dxe5 Rxg6+ Kf7 Bf5 Ne2+ Kf1 00:00:00.7 -1,84 7 87128 Qxc1 00:00:00.8 -1,84 8 107897 Qxc1 00:00:01.4 -1,56 8 201506 Qxc1 Nxc1 Bxg6 Ne2+ Kh2 Nd4 e6 a3 Nf5 Nxf5 00:00:02.5 -1,74 9 347443 Qxc1 Nxc1 Bxg6 Ne2+ Kh2 Nd4 Bxh5 dxe5 Ng4 Kh8 Nxe5 00:00:04.7 -1,90 10 726295 Qxc1 Nxc1 Bxg6 Rf8 Rb7 Rab8 Bf7+ Kh8 Rxb8 Rxb8 Bxh5 a3 c5 dxc5 00:00:09.1 -2,24 11 1454431 Qxc1 Nxc1 Bxg6 Rf8 Rb7 Rab8 Ra7 dxe5 Nf5 Rf6 Ne7+ Kf8 Bxh5 00:00:23.5 -2,24 12 3927091 Qxc1 Nxc1 Bxg6 Rf8 Rb7 Rab8 Ra7 dxe5 Nf5 Rf6 Ne7+ Kf8 Bxh5 Ncd3 00:01:49.0 -2,24 13 18647485 Qxc1 Nxc1 Bxg6 Rf8 Rb7 Rab8 Ra7 dxe5 Nf5 Rf6 Ne7+ Kf8 Bxh5 Ncd3 Bf3 00:03:32.6 -2,58 14 36536342 Qxc1 Nxc1 Bxg6 Ne2+ Kh2 Rf8 Rb7 Rab8 Rxb8 Rxb8 exd6 a3 Bb1 a2 Bxa2 Nxa2 c5 00:08:22.3 -3,24 15 86448285 Qxc1 Nxc1 Bxg6 Ne2+ Kh2 Rf8 Rb7 a3 Rxb4 Rf4 Kh3 Rxf2 Nc2 a2 Na1 Rf1 Bxh5 Rh1+ 00:27:28.8 -3,60 16 288111520 Qxc1 Nxc1 Bxg6 Ne2+ Kh2 Nd4 Bxh5 Rf8 Rb7 a3 Ng4 Rf4 Nh6+ Kh8 Kg3 a2 Kxf4 Nd3+ 01:01:55.0 -3,60 17 615178531 Qxc1 Nxc1 Bxg6 Ne2+ Kh2 Nd4 Bxh5 Rf8 Rb7 a3 Ng4 Regards, Eelco >i would conclude that this is *really* not a good test position, >and so i'm not that unhappy that muse has serious problems finding the "best" >moves. i admit, e5 and Rxf7 are a good "desperado" attempt to save the game, but >i don't really believe it's good enough.
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