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Subject: Re: Which engines can solve this? (Crafty 19.08)

Author: Mike Byrne

Date: 15:29:20 01/10/04

On January 10, 2004 at 17:47:25, Drexel,Michael wrote:

>On January 10, 2004 at 17:22:53, Kurt Utzinger wrote:
>
>>On January 10, 2004 at 15:29:16, David Dahlem wrote:
>>
>>>White to move and draw. Which engines can find it?
>>>
>>>[D]3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P1K2P/PPB5/8 w - - 0 1
>>>
>>>1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6. f5 1/2-1/2
>>>
>>>Regards
>>>Dave
>>
>>Crafty_1908  WB2: (P4 1.8/32 MB hash)
>> 3   00:00 -4.04   1. c4+ Kxc4 2. Bd3+ Kd5 3. Bxa6 cxd4+ 4. Kd3
>> 4   00:00 -4.01   1. c4+ Kxc4 2. Bd3+ Kd5 3. Bxa6 cxd4+ 4. Kd3 Ra7
>> 4   00:00 -3.64   1. Ba4+!!
>> 4   00:00  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5
>> 5   00:00  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5 Rba7
>> 6   00:00  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5 Rba7 7. Kf3
>> 7   00:01  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5 Rba7 7. Kf3 Rc6
>> 8   00:01  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5 Rba7 7. Kf3 Rc6 8. Ke4
>> 9   00:01  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5 Rba7 7. Kf3 Rc6 8. Ke4 Rb6
>>10   00:03  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5 Rba7 7. Kf3 Rc6 8. Ke4 Rb6 9. Kf3
>>11   00:08  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5 Rba7 7. Kf3 Rc6 8. Ke4 Rb6 9. Kf3 Rc6
>>12   00:11  0.00   1. Ba4+ Kxa4 2. b3+ Kb5 3. c4+ Kc6 4. d5+ Kd7 5. e6+ Kxd8 6.
>>f5 Rba7 7. Kf3 Rc6 8. Ke4 Rb6 9. Kf3 Rc6
>
>Interesting. Crafty 19.06 can't find 1.Ba4+.
>
>Michael
>
>New game
>3B4/1r2p3/r2p1p2/bkp1P1p1/1p1P1PPp/p1P1K2P/PPB5/8 w - - 0 1
>
>Analysis by Crafty 19.06:
>
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+
>  -+  (-4.45)   Depth: 1/18   00:00:00
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+
>  -+  (-4.45)   Depth: 1/18   00:00:00
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+
>  -+  (-4.45)   Depth: 2/18   00:00:00
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+
>  -+  (-4.45)   Depth: 2/18   00:00:00
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+
>  -+  (-4.45)   Depth: 2/18   00:00:00
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ 4.Kd3
>  -+  (-4.28)   Depth: 3/19   00:00:00
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Bxa6 cxd4+ 4.Kd3 Ra7
>  -+  (-4.25)   Depth: 4/19   00:00:00
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kd7 5.Bxb7 axb2 6.Bxa6 b1Q 7.Bxa5 dxe5
>8.dxc5 Qxa2
>  -+  (-5.36)   Depth: 5/23   00:00:00
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kd7 5.Bxb7 axb2 6.Bxa6 b1Q 7.Bxa5 dxe5
>8.dxc5 Qxa2
>  -+  (-5.36)   Depth: 6/24   00:00:00  392kN
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kd7 5.Bxb7 axb2 6.Bxa6 b1Q 7.Bxa5 dxe5
>8.dxc5 Qxa2
>  -+  (-5.36)   Depth: 7/26   00:00:01  806kN
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.Bxb7 gxf4+ 5.Kxf4 dxe5+ 6.dxe5 Ra7 7.Bxa5
>axb2 8.Bc8+ Kd5 9.Bb6 b1Q 10.Bxa7 Qxa2
>  -+  (-5.73)   Depth: 8/27   00:00:04  2236kN
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kd7 5.Bxb7 cxd4+ 6.Kxd4 dxe5+ 7.Kc5 Ra7
>8.bxa3 Bxd8 9.Bc6+ Kc7 10.axb4 Rxa2
>  -+  (-6.00)   Depth: 9/28   00:00:08  5405kN
>1.c4+ Kxc4 2.Bd3+ Kd5 3.Be4+ Ke6 4.f5+ Kf7 5.Bxb7 axb2 6.Bxa6 b1Q 7.Bxa5 Qxa2
>8.e6+ Kf8 9.Bb6 Qxa6 10.dxc5 dxc5 11.Bxc5
>  -+  (-6.55)   Depth: 10/30   00:00:31  21256kN

It becomes a block pawn position, so when crafty is compiled with /DDETECTDRAW,
it will find it.

Re: Which engines can solve this? (Crafty 19.08) Bob Durrett 17:23:32 01/10/04
- Re: Which engines can solve this? (Crafty 19.08) Mike Byrne 21:07:22 01/10/04
  - Re: Which engines can solve this? (Crafty 19.08) Uri Blass 23:46:18 01/10/04
    - Re: Which engines can solve this? (Crafty 19.08) Mike Byrne 06:08:55 01/11/04
      - Re: Which engines can solve this? (Crafty 19.08) Uri Blass 07:28:29 01/11/04
        
        Re: Which engines can solve this? (Crafty 19.08) Mike Byrne 08:15:37 01/11/04
        
        Re: Which engines can solve this? (Crafty 19.08) Uri Blass 08:30:48 01/11/04
        
        Re: Which engines can solve this? (Crafty 19.08) Jeremiah Penery 10:07:52 01/11/04
  - try this one .... Mike Byrne 21:10:50 01/10/04

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