Author: Bernhard Bauer
Date: 02:28:48 09/01/98
Go up one level in this thread
On August 30, 1998 at 09:46:29, Enrique Irazoqui wrote:
>[Event ""Rigasche Rundschau""]
>[Site "?"]
>[Date "1907.??.??"]
>[Round "?"]
>[White "Behting"]
>[Black "?"]
>[Result "1-0"]
>[SetUp "1"]
>[FEN "8/8/8/5pp1/8/1K6/2pp1Q2/2k5 w - - 0 1"]
>[PlyCount "5"]
>[EventDate "1907.??.??"]
>
>1. Qe3 f4 2. Qf2 d1=Q (2... f3 3. Qe3) 3. Kc3 f3 4. Qe3+ Kb1 5. Qb6+ Kc1 6. Qb2#
>1-0
>
>This is a relatively simple position where white wins in 12 plies or less, but
>several programs fail to find Qe3, even after a search deeper than 12 plies.
>
>After at least 5 minutes on a PII-400 with 256 MB RAM, Hiarcs 6, Fritz 5, Mchess
>7.1, Nimzo 98, Crafty 15.17, Exchess 2.34 and Junior 4.6 don’t find the
>solution. Junior plays instantaneously Kc3?? and announces mate in 4,
>overlooking the obvious underpromotion d1N+.
>
>Time to find Qe3 with a winning evaluation:
>Genius 5W, 13 secs.
>Rebel 9, 30 secs.
>Rebel 10, 24 secs.
>Shredder 2, 24 secs.
>
>Strange that there is so much difference between programs in this position.
>
>What would Ferret, Dark Thought and others play?
>
>Enrique
Dear Enrique,
Tu etiam ... !!!
You should have known better -:) This type of positions *never* occurs in
reall games and if it occurs than only in 0.0000000000001 % of all cases.
Programmers are interested in playing games - not in solving studies!!
By the way, a studie is a position we can not solve within a resonable amount
of time. So not solving this position is a feature! And it makes the program
faster and playing better in 99.9999999999999 % of all possible positions.
We have been told that so often that you should know.
Or do you dare to say something against the null move feature?
Here some output from a modified crafty - *no* null move.
Qe3+ Qd2 5. Qg1+ Qd1 6. Qe3+
11-> 58.67 -0.66 1. Ka2 f4 2. Kb3 f3 3. Ka2 d1=Q 4.
Qe3+ Qd2 5. Qg1+ Qd1 6. Qe3+
12 1:43 -0.66 1. Ka2 d1=Q 2. Qe3+ Qd2 3. Qg1+ Qd1
4. Qe3+
12 2:49 ++ 1. Qe3!!
12 3:06 5.96 1. Qe3 f4 2. Qf2 f3 3. Qe3 f2 4. Qxf2
g4 5. Qe3 g3 6. Kc3 Kb1 7. Kxd2
12-> 3:06 5.96 1. Qe3 f4 2. Qf2 f3 3. Qe3 f2 4. Qxf2
g4 5. Qe3 g3 6. Kc3 Kb1 7. Kxd2
13 3:13 ++ 1. Qe3!!
13 3:49 9.24 1. Qe3 f4 2. Qf2 f3 3. Qe3 g4 4. Kc3
Kb1 5. Qb6+ Kc1 6. Qb2+ Kd1 7. Qxc2+
Ke1 8. Qxd2+ Kf1 9. Qg5 Ke2 10. Qxg4
13-> 5:41 9.24 1. Qe3 f4 2. Qf2 f3 3. Qe3 g4 4. Kc3
Kb1 5. Qb6+ Kc1 6. Qb2+ Kd1 7. Qxc2+
Ke1 8. Qxd2+ Kf1 9. Qg5 Ke2 10. Qxg4
14 6:00 ++ 1. Qe3!!
14 8:03 Mat17 1. Qe3 f4 2. Qf2 f3 3. Qe3 g4 4. Kc3
Kb1 5. Qb6+ Kc1 6. Qb2+ Kd1 7. Qxc2+
Ke1 8. Qxd2+ Kf1 9. Qg5 Ke2 10. Qxg4
<EGTB>
14-> 13:02 Mat17 1. Qe3 f4 2. Qf2 f3 3. Qe3 g4 4. Kc3
Kb1 5. Qb6+ Kc1 6. Qb2+ Kd1 7. Qxc2+
Ke1 8. Qxd2+ Kf1 9. Qg5 Ke2 10. Qxg4
<EGTB>
time: 13:02 cpu:200% mat:6 n:158539669 nps:202622
ext-> checks:23356809 recaps:392669 pawns:1749198 1rep:4192114
predicted:0 nodes:158539669 evals:2801460
endgame tablebase-> probes done: 2012494 successful: 2012494
hashing-> trans/ref:70% pawn:12% used:w99% b99%
mate in 17 moves.
Please take the above with a grain of salt. -:)))
Kind regards
Bernhard
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