Author: Mike Byrne
Date: 15:37:27 09/15/03
Go up one level in this thread
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
but after 4 minutes - it gets more favorable with Nd3, prefering 6.Nb2 over
6.Qc3 ...but it always likes Bxf2 best
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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