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Subject: Re: Some difficult problems from BWTC

Author: Steven Edwards

Date: 16:12:34 12/08/03

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On December 08, 2003 at 18:30:57, Steven Edwards wrote:

>I've been testing Symbolic's low level search on the BWTC test suite. Althouh
>the program can solve almost all of the 1,001 positions in a few seconds or less
>each, there are a few holdouts.

Here's BWTC.0570 (key move Rd1+):

[D]1k1r4/1bp2p2/1p6/2r1PB1p/PQ4pP/6B1/5PP1/6K1 b - -

[SI] [01] (1... Ba6)  Score: -2.330
[SI] [02] (1... Ba6 2. Kh2)  Score: -2.330
[SI] [03] (1... Ba6 2. Kh2 Rc4)  Score: -2.330
[SI] [04] (1... Ba6 2. Kh2 Rc4 3. Qb3)  Score: -2.330
[SI] [05] (1... Ba6 2. Kh2 Rc4 3. Qb3 Ka7)  Score: -2.330
[SI] [06] (1... Ba6 2. Kh2 Rc4 3. Qb3 Ka7 4. f4)  Score: -2.330
[SI] [07] (1... Ba6 2. Kh2 Rc4 3. Qb3 Rdd4)  Score: -2.330
[SI] [08] (1... Ba6 2. Kh2 Ka7)  Score: -2.330
[SI] [09] (1... Ba6 2. Kh2 Ka7 3. f4 Rd1)  Score: -2.330
[SI] [09] (1... Rc1+)  Score: -1.330
[SI] [09] (1... Rc1+ 2. Kh2 Rdd1 3. Qf8+ Ka7 4. Qa8+ Bxa8 5. Bf4 Rc4 6. Kg3 Rxa4
7. Bc8)  Score: +7.670
[SI] [10] (1... Rc1+)  Score: +8.670
[SI] [10] (1... Rc1+ 2. Kh2 Rdd1 3. Qf8+ Ka7 4. Qa8+ Bxa8 5. Bf4 Rh1+ 6. Kg3
Rh3+ 7. gxh3 Rg1+ 8. Kh2 Rh1+ 9. Kg3 Rxh3#)  Score: MateIn9

Does anyone else get this?  Is there a faster mate?



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