Author: Mike Hood
Date: 02:58:11 11/10/01
Go up one level in this thread
On November 08, 2001 at 17:07:12, Dieter Buerssner wrote:
>On November 08, 2001 at 06:12:44, Mike Hood wrote:
>
>>You can't make a chess program play worse by using EGTBs, can you? Not usually,
>>but look at the following study that involves castling. Crafty has all 5-piece
>>EGTBs at its disposal, in particular KRPKR. It's Black's move, Black has just
>>been checked by White's pawn, White can still castle.
>>
>
>[D] 2k5/3P4/8/8/8/8/1r5p/R3K3 b Q - 0 1
>
>I think the castling rights will not play a role in real games. However it was
>easy to fix for my program Yace (just one line). Before this, I get the almost
>funny line:
>
> 1 0.004 1.99 1t 1...Kxd7 {80}
> 5 0.009 1.99 1. 1...Kxd7 {80}
> 6 0.629 Mat17 2++ 1...Kxd7 {EGTB} 2. O-O-O+! Ke7 3. Kxb2! Ke6 4.
> Rh1 Kd6 5. Rxh2 Ke6 6. Rh5 Ke7 7. Rh6 Kf7! 8.
> Ra6 Kg7 9. Kb3 Kh7 10. Re6 Kh8 11. Kb4 Kg8 12.
> Kc5! Kf8 13. Kd6! Kf7! 14. Kd7! Kf8 15. Re7!
> Kg8 16. Ke8! Kh8 17. Kf7! Kh7 18. Re6! Kh8 19.
> Rh6#! {-500}
> 7 0.832 Mat17 2t 1...Kxd7 {EGTB} 2. O-O-O+! Ke7 3. Kxb2! Ke6 4.
> Rh1 Kd6 5. Rxh2 Ke6 6. Rh5 Ke7 7. Rh6 Kf7! 8.
> Ra6 Kg7 9. Kb3 Kh7 10. Re6 Kh8 11. Kb4 Kg8 12.
> Kc5! Kf8 13. Kd6! Kf7! 14. Kd7! Kf8 15. Re7!
> Kg8 16. Ke8! Kh8 17. Kf7! Kh7 18. Re6! Kh8 19.
> Rh6#! {-500}
> 86 0.893 Mat17 2. 1...Kxd7 {EGTB} 2. O-O-O+! Ke7 3. Kxb2! Ke6 4.
> Rh1 Kd6 5. Rxh2 Ke6 6. Rh5 Ke7 7. Rh6 Kf7! 8.
> Ra6 Kg7 9. Kb3 Kh7 10. Re6 Kh8 11. Kb4 Kg8 12.
> Kc5! Kf8 13. Kd6! Kf7! 14. Kd7! Kf8 15. Re7!
> Kg8 16. Ke8! Kh8 17. Kf7! Kh7 18. Re6! Kh8 19.
> Rh6#! {-500}
>
>The score is from black's point of view. Mate in 17, while the line shows, that
>black gets mated ...
>
>
>After the fix (just disabling TBs while castling is allowed):
>
> 76196 3.537 Mat19 11++ 1...Kd8 2. O-O-O Rg2 3. Rf1 Kxd7 {EGTB} 4.
> Rf7+! Kd6 5. Rh7 {Not all positions found in
> TB} {80}
> 1182192 14.201 Mat18 11t 1...Kd8 2. Ra8+ Kxd7 {EGTB} 3. Rh8 {Not all
> positions found in TB} {80}
> 1299058 15.776 Mat18 11. 1...Kd8 2. Ra8+ Kxd7 {EGTB} 3. Rh8 {Not all
> positions found in TB} {80}
>
>Regards,
>Dieter
How did you draw that picture of the board? Are there any (free) chess DTP tools
that I'm not yet aware of?
Mike :)
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