Author: Robert Sherman
Date: 20:07:06 11/09/97
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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 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. 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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