Author: Drexel,Michael
Date: 22:51:46 09/15/03
Go up one level in this thread
On September 15, 2003 at 18:37:27, Mike Byrne wrote: >On September 15, 2003 at 13:23:14, Drexel,Michael wrote: > >>On September 15, 2003 at 12:55:53, Tord Romstad wrote: >> >>>On September 15, 2003 at 12:29:52, Drexel,Michael wrote: >>> >>>>On September 15, 2003 at 12:25:25, Tord Romstad wrote: >>>> >>>>>On September 14, 2003 at 17:58:56, Roy Eassa wrote: >>>>> >>>>>>[d] 4r1k1/p4ppp/1p1q1n2/1Pb1n3/8/1N4P1/PB3PBP/2RQ2K1 b - - 0 1 >>>>>>Brutus played ...Bxf2+ >>>>>> >>>>>>1... Bxf2+!? >>>>> >>>>>Like Will Singleton, I think many (perhaps even most) programs will >>>>>play Bxf2, but I think finding a win for white will take a very long >>>>>time. >>>>> >>>>>Gothmog 0.3.0 plays Bxf2 after less than 4 seconds, but it's a purely >>>>>speculative sacrifice. The score is not at all convincing: >>>> >>>>It is not speculative, it is almost forced. Everything else is very bad for >>>>white. >>> >>>Sorry, I should have been clearer. I meant that Gothmog plays Bxf2 as >>>a speculative sacrifice, from a subjective point of view. It does not >>>see a win for black, but just gambles that black's attacking chances will >>>be sufficient to compensate for the piece. >>> >>>Tord >> >>You are the programmer ... >> >>But if your program also sees in less than 4 seconds that >>1... Nd3 is bad because of the forced >>2. Nxc5 bxc5 3. Bf1 Re1 4. Qd2 Rxc1 5. Bxc1 c4 6. Qc3 Qd5 7. Bxd3 Qxd3 >>8. Qxd3 cxd3 (with clearly better endgame for white) then it would be quite an >>achievement. >>All top programs need at least several minutes to find it. >> >>Michael > > >Crafty 19.04 SE Morphy needs 16 seconds to see the line Nd3 above > > > 13 16.36 0.31 1. ... Nd3 2. Nxc5 bxc5 3. Bf1 Re1 > 4. Qd2 Rxc1 5. Bxc1 c4 6. Qc3 Qd5 7. > Bxd3 Qxd3 8. Qxd3 cxd3 9. Bd2 > 13-> 16.36 0.31 1. ... Nd3 2. Nxc5 bxc5 3. Bf1 Re1 > 4. Qd2 Rxc1 5. Bxc1 c4 6. Qc3 Qd5 7. > Bxd3 Qxd3 8. Qxd3 cxd3 9. Bd2 > 14 22.25 -- 1. ... Nd3 > 14 34.20 1.07 1. ... Nd3 2. Nxc5 bxc5 3. Bf1 Re1 > 4. Qd2 Rxc1 5. Bxc1 c4 6. Qc3 Qd5 7. > Bxd3 Qxd3 8. Qxd3 cxd3 9. Be3 Kf8 10. > Bxa7?? d2 -+ > >but after 4 minutes - it gets more favorable with Nd3, prefering 6.Nb2 over >6.Qc3 ...but it always likes Bxf2 best Crafty 19.03 prefers 6.Bb2 a long time even here: [D] 6k1/p4ppp/3q1n2/1P6/2p5/3n2P1/P2Q1P1P/2B2BK1 w - - 0 6 After almost 10 minutes it finally switches to 6.Qc2 which is as strong as 6.Qc3. Other freebies like Aristarch or Yace have big problems here too. Shredder 7.04 and Fritz 8 are much faster. They solve it instantly. So what is the reason? The white King will be very active in a couple of moves. Michael > 16-> 4:51 0.18 1. ... Nd3 2. Nxc5 bxc5 3. Bf1 Re1 > 4. Qd2 Rxc1 5. Bxc1 c4 6. Bb2 Ne8 7. > Bc3 Qd5 8. a4 Nd6 9. Bg2 Ne4 10. Qe3 > Ndxf2 11. Qxa7
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