Author: Geoff Westwood
Date: 13:34:47 02/18/04
Go up one level in this thread
Hi Robert
Yep, agreed black is probably lost by this stage anyways. As a matter of
interest what does Crafty do when a fail low occurs ? I am guessing it increases
its thinking time ? How much does it increase by ?
Regards Geoff
On February 18, 2004 at 16:12:52, Robert Hyatt wrote:
>On February 18, 2004 at 16:08:41, Geoff Westwood wrote:
>
>>Hi
>>
>>This position is from a post by Gábor Szõts. ElChinito_325 (White) v Abrok 5.0
>>(Black)
>>
>>[D]2q2r1k/2P2ppp/2R1p3/3bN3/rp3B2/1n4Q1/1P4PP/3R2K1 b - - 0 26
>>
>>Abrok lost quickly by grabbing the juicy looking rook Bxc6. My program also
>>staggered around for 90 seconds trying to find a half decent move for black.
>>
>>CM9000 took about 10 secs to discover that taking the Rook is very bad
>>
>>At least my program and CM9000 both eventually agree that the best move is Ra1.
>>Having seen this example I think I should maybe go and add a thinking time
>>extension for a fail low, I hadn't bothered until now. It might help me stop
>>making some particularly dumb moves.
>
>I think this is trouble no matter what move you try...
>
> 9-> 4.19 0.88 1. ... Bxc6 2. Bh6 gxh6 3. Rd8 Ra1+
> 4. Kf2 Rf1+ 5. Kxf1 Qa6+ 6. Kf2 Qb6+
> 7. Qe3 Qxc7 8. Rxf8+ (s=2)
> 10 4.51 -- 1. ... Bxc6
> 10 5.36 2.83 1. ... Bxc6 2. Bh6 gxh6 3. Rd8 Ra1+
> 4. Kf2 Be8 5. Rxc8 Nd2 6. Nxf7+ Rxf7+
> 7. Ke2 Re7 8. Kxd2
> 10 8.25 1.68 1. ... Ra1 2. Rxa1 Nd4 3. Qf2 Nxc6
> 4. Nxc6 Bxc6 5. Bd6 Re8 6. Qxf7 b3
> 10-> 10.28 1.68 1. ... Ra1 2. Rxa1 Nd4 3. Qf2 Nxc6
> 4. Nxc6 Bxc6 5. Bd6 Re8 6. Qxf7 b3
> (s=4)
> 11 10.51 -- 1. ... Ra1
> 11 10.87 2.08 1. ... Ra1 2. Rxa1 Nd4 3. Qf2 Nxc6
> 4. Nxc6 Bxc6 5. Bd6 Re8 6. Qxf7 b3
> 7. Rf1 (s=3)
> 11-> 19.81 2.08 1. ... Ra1 2. Rxa1 Nd4 3. Qf2 Nxc6
> 4. Nxc6 Bxc6 5. Bd6 Re8 6. Qxf7 b3
> 7. Rf1 (s=14)
> 12 21.04 2.13 1. ... Ra1 2. Rxa1 Nd4 3. Qf2 Nxc6
> 4. Nxc6 Bxc6 5. Bd6 Rg8 6. Qxf7 b3
> 7. Ra3 Bd5 (s=13)
> 12-> 42.18 2.13 1. ... Ra1 2. Rxa1 Nd4 3. Qf2 Nxc6
> 4. Nxc6 Bxc6 5. Bd6 Rg8 6. Qxf7 b3
> 7. Ra3 Bd5 (s=12)
> 13 46.39 2.38 1. ... Ra1 2. Rxa1 Nd4 3. Qf2 Nxc6
> 4. Nxc6 Bxc6 5. Bd6 Re8 6. Qxf7 e5
> 7. Rc1 Qa8 8. Rc5 Bxg2 9. Bxe5 (s=11)
>
>My dual xeon 2.8 drops Bxc6 quickly, needing 8.25 seconds to switch to Ra1. But
>Ra1 doesn't look all that rosey either...
>
>>
>>
>>Ply Eval Time Nodes Principle Variation
>> 1 195 0 100 d5c6 e5c6
>> 2 195 0 927 d5c6 e5c6
>> 3 200 0 2611 d5c6 e5c6 b3c5
>> 4- 160 1 17178 d5c6
>> 4 104 4 36557 f7f6 f4h6 g7h6 d1d5 e6d5 g3b3
>> 5 119 10 90837 f7f6 c6b6 f6e5 b6b8 e5f4 b8c8 f4g3 c8f8
>> 6 119 28 203744 f7f6
>> 7 91 82 619528 f7f6 c6b6 f6e5 f4e5 f8g8 b6b8 c8a6 d1d5 e6d5 g3b3
>> 8 81 203 1452043 f7f6 c6b6 f6e5 b6b8 e5f4 b8c8 f8c8 g3f4
>> 9- 41 862 6294138 f7f6
>> 9 -30 2239 15651825 d5c6 e5f7 h8g8 d1d8 a4a1 g1f2 b3c1 d8c8 f8c8 f7h6
>>g8h8 h6f7 h8g8
>>10- -70 5362 37011086 d5c6
>>10 -105 8768 60476406 a4a6
>>11 -119 15540 106180448 a4a1 d1a1 b3a1 c6d6 c8c7 d6d7 c7c8 e5f7 f8f7 d7f7
>>c8g8 f7c7
>>12 -109 25546 173819086 a4a1 d1a1 b3a1 c6d6 c8c7 d6d7 c7c8 e5f7 f8f7 d7f7
>>c8g8 f7c7 a1b3
>>
>> Geoff
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