Author: Bernhard Bauer
Date: 01:08:54 02/14/00
Go up one level in this thread
On February 13, 2000 at 08:44:31, Andrew Carey wrote:
>On February 13, 2000 at 06:58:08, Enrique Irazoqui wrote:
>
>>Yesterday I found this 1965 study of Hasek, perfect for a "secret" test set, but
>>too beautiful to keep it hiding. I find amazing how the g pawn wins the game and
>>also the traveling of black's king to its original e8 square, as if in aeternal
>>return.
>>
>>Of the engines I tried, Nimzo is the fastest in finding 1.b6+ in 44'', followed
>>by Hiarcs 8 pre-alpha in 275'', F6a in 432'', and J6a in 554''. Other programs I
>>tried didn't solve it in less than 15 minutes on a PIII-500. Enjoy.
>
>There is no enjoyment. Only for those who believe chess computers are magic and
>do not understand them at all.
>
>To solve this position requires no more than:
>
>king=infinity
>queen=9
>rook=5
>bishop=nite=3
>pawn=1
>
>To solve this position relative fast requires no more than extensions on check.
>To solve relative faster requires no more than extensions on one-move-only
>reply.
>It is possible to work out at which depth an unintelligent material only program
>will solve it. Please look at Crafty source for these extension types. These
>have been for years now.
>
>b6+ this is a check and does not decrement depth
>Kxb6
>Nd7+ this is check and does not decrement depth
>Kc6
>Qa6+ this is check and does not decrement depth
>KxNd7 this is forced single move reply and does not decrement depth
>e6++ this is check and does not decrement depth
>Ke8
>Qa8++ this is check and does not decrement depth
>Qe8 this is forced single move reply and does not decrement depth
>g6
>Qxa8
>g7
>anymove - throwing away the queen will horizon two plys
>g8=Q++
>
>Eight or nine plies of search is enough. Another two ply for final adjust to
>position. Each adjust is with mate threat. Six plies enough if extra extension
>on mate in alternate branch and nullmove mate threat detect. The position is
>solved with no evaluation function necessary. Computer chess is not magic even
>though it may seem like so to some.
>
>Please do not post positions marked as "great" to a computer chess board when
>the position is not interesting. Computer chess is no magic. Computer chess is
>quite logical.
>
>Please do not add to any test set, secret, magic or otherwise. This magic test
>set only will only detect for simple programs with no intelligence. This is not
>computer chess.
>
>All is detected by material. Not magic. Not great.
>
>Thank you.
>
Dear Andrew,
as WE are the experts and WE don't know you, you can't be an expert, can't you?
BTW isn't that great logic?
So you first have to clap everyones shoulder and appreciate every nonsense and
even off topic stuff if it's from an expert.
Having said this, I'm going to test your statement about the position in
question.
First let's use the following extension for Crafty:
ext/singular=0.25
one-reply extension..................0.25
in-check extension..................0.75
recapture extension..................0.50
pushpp extension..................0.50
mate thrt extension..................0.25
singular extension..................0.25
(4) 14-> 4:07 0.00 1. Qxc7+ Ka8 2. Qxa5+ Kxb8 3. Qb6+
Kc8 4. Qc6+ Kb8 5. Qb6+
(3) 15 4:41 0.00 1. Qxc7+ Ka8 2. Qxa5+ Kxb8 3. Qb6+
Kc8 4. Qc6+ Kb8 5. Qb6+
15 10:51 ++ 1. b6+!!
15 11:27 4.37 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf1+ 10.
Kxf1 Kf8 11. Qf3+ Kg8 12. Qxc3
(4) 15-> 12:35 4.37 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf1+ 10.
Kxf1 Kf8 11. Qf3+ Kg8 12. Qxc3
Now let's use the default extensions:
one-reply extension..................0.75
in-check extension..................1.00
recapture extension..................0.75
pushpp extension..................1.00
mate thrt extension..................0.75
singular extension..................0.75
(4) 10-> 1:12 0.00 1. Qxc7+ Ka8 2. Qxa5+ Kxb8 3. Qb6+
Kc8 4. Qc6+ Kd8 5. Qa8+ Kc7 6. Qc6+
Kd8
(3) 11 1:36 0.00 1. Qxc7+ Ka8 2. Qxa5+ Kxb8 3. Qb6+
Kc8 4. Qc6+ Kd8 5. Qa8+ Kc7 6. Qc6+
Kd8
11 5:51 ++ 1. b6+!!
11 5:56 4.37 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf1+ 10.
Kxf1 Kf8 11. Qf3+ Kg8 12. Qxc3
(4) 11-> 6:11 4.37 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf1+ 10.
Kxf1 Kf8 11. Qf3+ Kg8 12. Qxc3
12 6:14 ++ 1. b6+!!
(3) 12 6:25 5.07 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf2+ 10.
Kxf2 Kf8 11. Qf3+ Kg8 12. Qf7+ Kh8
13. Qf8+ Kh7 14. Qxe7+ Kg6 15. Qxc7
(4) 12-> 7:52 5.07 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf2+ 10.
Kxf2 Kf8 11. Qf3+ Kg8 12. Qf7+ Kh8
13. Qf8+ Kh7 14. Qxe7+ Kg6 15. Qxc7
And now let's use even the following set:
one-reply extension..................1.00
in-check extension..................1.00
recapture extension..................0.50
pushpp extension..................0.50
mate thrt extension..................1.00
singular extension..................0.25
(3) 9-> 23.76 0.00 1. Qxc7+ Ka8 2. Qxa5+ Kxb8 3. Qb6+
Ka8 4. Qa6+ Kb8 5. Qb6+
(2) 10 31.00 0.00 1. Qxc7+ Ka8 2. Qxa5+ Kxb8 3. Qb6+
Ka8 4. Qa6+ Kb8 5. Qb6+
10 1:11 ++ 1. b6+!!
10 1:13 3.03 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf2+ 10.
Kxf2 Nd3+ 11. Ke3 Ne5 12. Qd5
(4) 10-> 1:13 3.03 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf2+ 10.
Kxf2 Nd3+ 11. Ke3 Ne5 12. Qd5
11 1:13 ++ 1. b6+!!
(3) 11 1:18 4.60 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf2+ 10.
Kxf2 Kf8 11. Qf3+ Kg8 12. Qf7+ Kh8
13. Qf8+ Kh7 14. Qxe7+
(4) 11-> 2:08 4.60 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 Qxa8 7.
g7 Qf3 8. g8=Q+ Qf8 9. Qg2 Qf2+ 10.
Kxf2 Kf8 11. Qf3+ Kg8 12. Qf7+ Kh8
13. Qf8+ Kh7 14. Qxe7+
12 2:10 ++ 1. b6+!!
(3) 12 2:21 7.26 1. b6+ Kxb6 2. Nd7+ Kc6 3. Qa6+ Kxd7
4. e6+ Ke8 5. Qa8+ Qd8 6. g6 c2 7.
Qc6+ Qd7 8. exd7+ Kd8 9. Qa8+ Kxd7
10. Qd5+ Ke8 11. Qb5+ c6 12. Qb8+ Kd7
13. Qxb2 Ke6 14. Kf2 a4 15. Qxc2
So the results show that you are pretty right.
Your English is unusually well. (Ahh, for CCC)
Should you by accident meet Bella, please tell her some greetings.
Kind regards
Bernhard
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