Author: Omid David
Date: 14:45:18 10/04/02
Go up one level in this thread
On October 04, 2002 at 16:35:28, Jeremiah Penery wrote: >On October 04, 2002 at 08:03:19, Omid David wrote: > >>And a third position which is also a draw: >> >>[D] 8/8/8/k3p3/1p1pPp2/1PpP1P2/B1P5/1K6 w - - 0 1 > >No fair, an illegal position! :) Thank you for posting the results. BTW, the position above isn't legal, it could arise from the following sequence of moves: Bf1 -> h3 -> e6 -> a2 And then the b2 pawn moving to b3 and suffocating the bishop on a2 :-) > >The algorithm doesn't do very well here. It sees there is a potential path for >the king, and doesn't give a drawscore. I think it's sort of failing at the >right edge of the board in certain circumstances. > >I figured out the problem, and now it does well here: > >With: > > 1 0.00 0.00 1. Kc1 > 1-> 0.00 0.00 1. Kc1 > .......................................... > 45 4.33 0.00 1. Kc1 Kb5 2. Bb1 Kc5 3. Kd1 Kd6 4. > Ke2 Ke6 5. Kf2 Kf6 6. Kg2 Kg5 7. Kh3 > Kh5 8. Ba2 Kg5 9. Bb1 > 45-> 4.33 0.00 1. Kc1 Kb5 2. Bb1 Kc5 3. Kd1 Kd6 4. > Ke2 Ke6 5. Kf2 Kf6 6. Kg2 Kg5 7. Kh3 > Kh5 8. Ba2 Kg5 9. Bb1 > > Elapsed Time: 4.42, CPU Time: 4.24, CPU Use: 95% > Material Balance: 350, Previous Moves Predicted: 0 > Nodes: 3952436, Evaluations: 1585606, FH%: 89%, NPS: 894k > EXTENSIONS-> > Threat: 11, Passed Pawn: 10565, Recapture: 6796 > One-Reply: 3021, Check: 382285 > PRUNING-> Razors-> White: 2464, Black: 19345 > Futility-> White: 83766, Black: 247508 > TABLEBASES-> Probes: 53, Successful: 18 > HASH TABLES-> Hash Hits: 59% (816165/1365799) > Pawn Hash Hits: 99% (2287204/2288627) > Hash Table Filled: 24% > > >Without: > > 1 0.00 3.40 1. Kc1 > 1-> 0.00 3.40 1. Kc1 > ........................... > 41 4.43 -- 1. Kc1 > 41 6.72 0.00 1. Kc1 Kb6 2. Kd1 Kc6 3. Ke2 Kd6 4. > Kf2 Ke6 5. Kg2 Kf6 6. Kf1 Kg6 7. Kg2 > Kh6 8. Kh3 Kg5 9. Kh2 Kg6 10. Kh3 Kg5 > 41-> 6.72 0.00 1. Kc1 Kb6 2. Kd1 Kc6 3. Ke2 Kd6 4. > Kf2 Ke6 5. Kg2 Kf6 6. Kf1 Kg6 7. Kg2 > Kh6 8. Kh3 Kg5 9. Kh2 Kg6 10. Kh3 Kg5 > ........................... > 45 28.70 0.00 1. Kc1 Kb6 2. Kd1 Kc6 3. Ke2 Kd6 4. > Kf2 Ke6 5. Kg2 Kf6 6. Kf1 Kg6 7. Kg2 > Kh6 8. Kh3 Kg5 9. Kh2 Kg6 10. Kh3 Kg5 > 45-> 28.70 0.00 1. Kc1 Kb6 2. Kd1 Kc6 3. Ke2 Kd6 4. > Kf2 Ke6 5. Kg2 Kf6 6. Kf1 Kg6 7. Kg2 > Kh6 8. Kh3 Kg5 9. Kh2 Kg6 10. Kh3 Kg5 > > Elapsed Time: 28.78, CPU Time: 28.04, CPU Use: 97% > Material Balance: 350, Previous Moves Predicted: 0 > Nodes: 32458587, Evaluations: 5693896, FH%: 97%, NPS: 1127k > EXTENSIONS-> > Threat: 835, Passed Pawn: 500170, Recapture: 8659 > One-Reply: 70371, Check: 1464672 > PRUNING-> Razors-> White: 298398, Black: 84185 > Futility-> White: 4197130, Black: 1149765 > TABLEBASES-> Probes: 6265, Successful: 1612 > HASH TABLES-> Hash Hits: 103% (15629675/15116155) > Pawn Hash Hits: 99% (13413939/13418667) > Hash Table Filled: 86%
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