Author: Dieter Buerssner
Date: 14:07:12 11/08/01
Go up one level in this thread
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
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