Author: Randolph S. Baker
Date: 07:45:51 11/10/97
Go up one level in this thread
On November 09, 1997 at 23:07:06, Robert Sherman wrote: >On November 09, 1997 at 18:00:30, Ed Schröder wrote: > > >> >>I am aware of this for years. Rebel is programmed for fast recaptures. >>This algorithm of course has some negative side effects shown in the >>below game which fortunately are big exceptions. >> >>Still I prefer to leave it the way it is now because removing the >>algorithm would mean Rebel will think 3-5 minutes again on simple >>recaptures. I received too many complaints about that in the past. >> >>Thus so now and then you are lucky :) >> >>- Ed Schroder - >> >> > > >I disagree that this is a "simple recapture." In this game there is a >material imbalance and a positional imbalance. The Nxc7 is a sacrifice Furthermore, a N giving itself up for a P in any position should warrant additional inspection. Surely anyone who volunteers material freely might be "up to something", and the time management algorithm should take this into account. >that should be rejected with black easily winning. A human would think >if I stop the attack on my king, I win easily and take their time >knowing that it is the most important move in the game. Rebel 9's score >drops almost immediately from from +8 to + 5 and Rebel's time estimation >thinks it will take from 3 to 5 minutes. Then all of sudden it takes >the knight after 30 seconds of thought. On the fixed time level it sees >at least a draw and changes its move to Bf2+ in 45 seconds. This move >is a sac, not a recapture. A simple recapture would be taking back a >knight after bishop was captured, or an exchange of rooks, which 30 >seconds would be enough time to look for an in-between move. Anyway, >Rebel on the fixed time control changes its PV away from Qxc7 the second >fastest of the many programs I have tested. Genius is number one by >playing d5 in what I think was 12 seconds. Also, it is the only >computer that would suggest the winning sac try of Nxc7, I wonder if any >other computer would try that. I didn't test Rebel 9 with that. Go Hiarcs 6! On an admittedly faster computer (PII 233), Hiarcs 6 considers 9. ... Qxc7?? for a mere 4 seconds. It chooses 9. ... D5 as the refutation, in somewhere between 15 and 30 seconds. (I was tinkering around with the analysis, so the cache contents were speeding up times after a while). Also, Hiarcs finds 9. Nxc7! in 120 seconds. Perhaps not as fast as Genius, but Hiarcs is not known for speed. >Anyway, I really like Rebel 9 and I am happy I purchased it. So keep up >the good work. > >Robert Sherman > > >> >>>White : Robert Sherman Black: Rebel 9 >> >>>1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. Nc3 Nc6 5. Nd5 Nxe4 6. d3 >>> Nxf2 7. Qe2 Nxh1 8. Ng5 O-O 9. Nxc7 Qxc7 10. Qh5 h6 11. Bxf7 >>>Kh8 12. Qg6 Qa5 13. c3 Qxc3 14. bc Bf2 15. Kd1 Ne7 16. Qh7#
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