Author: Ernst Walet
Date: 13:11:56 02/21/01
Go up one level in this thread
On February 21, 2001 at 15:53:25, Uri Blass wrote: >I read in http://amateurschach.in-trier.de/news.htm > >Evaluation of Deep Sos +4.xx when Yace say 0.00 > >It seems that Yace was right because the game ended in a draw so it is >interesting to know which position Sos evaluated as +4.xx > >Here is a position from the game: > >[D]8/p2RP3/4r3/5pp1/2kp4/P3PK2/8/8 w - - 0 1 > >The game was finished after 46.exd4 Kd3 47.d5 Re3+ 48.Kf2 Kd2 49.d6 when black >has a simple perpetual check. >I guess that Deep Sos had big positional value for 2 pawns in the 6th,7th >without extensions for perpetual check that yace had. > >How much time do chess program need to see that exd4 leads to a draw? >How much time do chess programs need to find 46...Kd3(Is it the only drawing >move)? > >Uri CM8000, PIII-500E, 128MB hash: 11 seconds on both questions, if you agree that 0.06 is a draw score. Time Depth Score Positions Moves 0:01 1/5 0.37 9418 1. exd4 Kd3 2. Rxa7 Kxd4 3. Ra4+ Kd5 0:02 2/6 0.51 26843 1. exd4 g4+ 2. Kf4 Re1 3. d5 Kc5 4. Kxf5 g3 0:02 3/7 0.57 69460 1. exd4 g4+ 2. Kf4 Re1 3. d5 Kc5 4. d6 Kc6 5. Rd8 0:04 4/8 0.57 188326 1. exd4 Re4 2. d5 Rf4+ 3. Kg3 Rg4+ 4. Kf2 Rf4+ 5. Ke2 Re4+ 6. Kd2 Rd4+ 7. Kc2 Re4 8. d6 Re2+ 9. Kd1 0:11 5/9 0.06 629727 1. exd4 Kd3 2. Rc7 Kxd4 3. Rxa7 Ke5 4. a4 Kf6 5. a5 Re1 0:19 6/10 0.01 1136460 1. exd4 Kd3 2. Rb7 Kxd4 3. Rxa7 Ke5 4. Ra5+ Kd4 5. Rxf5 Rxe7 6. a4 Re3+ 7. Kg4 0:32 7/11 0.00 2121408 1. exd4 Kd3 2. Rxa7 Kd2 3. Kf2 Re2+ 4. Kg3 Re3+ 5. Kf2 Re2+ 1:05 8/12 0.00 4503948 1. exd4 Kd3 2. Rxa7 Kd2 3. Kf2 Re2+ 4. Kg3 Re3+ 5. Kf2 Re2+ 2:25 9/13 0.00 10433648 1. exd4 Kd3 2. Rxa7 Kd2 3. Kf2 Re2+ 4. Kg3 Re3+ 5. Kf2 Re2+ Ernst.
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