Author: Peter McKenzie
Date: 20:56:53 01/29/00
Go up one level in this thread
On January 29, 2000 at 22:04:03, Jon Dart wrote: Thanks for your reply Jon, interesting output from your program. I think what we are seeing here is a case of two different shaped searched. In these positions, your search is giving more accurate evaluations. Seems the inverse horizon effect is in action here too, see my later notes. >On the 1st position. Arasan's score goes negative at ply 11, >but not by much. I'm not sure if there is a defense there >or maybe all the checks and extensions are just pushing the >pain off the horizon (probably the latter). yes, it seems the later is correct. > >ply 1. b6+ 0 seconds. score: -2.89 2 nodes. >ply 1. Rc5 0 seconds. score: -2.75 8 nodes. >ply 1. Rc5 0 seconds. score: -2.75 33 nodes. >ply 2. b6+ 0 seconds. score: -2.89 50 nodes. >ply 2. a7 0 seconds. score: -2.13 405 nodes. >ply 2. a7 0 seconds. score: 1.25 603 nodes. >ply 3. a7 0 seconds. score: 1.25 937 nodes. >ply 3. a7 1 seconds. score: 0.42 80797 nodes. >ply 4. b6+ 1 seconds. score: 1.05 83040 nodes. >ply 4. b6+ 1 seconds. score: 2.53 83432 nodes. >ply 5. b6+ 1 seconds. score: 2.53 85355 nodes. >ply 5. b6+ 1 seconds. score: 1.70 91046 nodes. >ply 6. Rxe5 2 seconds. score: 1.61 143229 nodes. >ply 6. Rxe5 2 seconds. score: 1.61 145894 nodes. >ply 7. Rxe5 3 seconds. score: 1.94 254988 nodes. >ply 8. Rxe5 9 seconds. score: 1.58 671775 nodes. >ply 9. Rxe5 18 seconds. score: 1.58 1344466 nodes. >ply 9. b6+ 26 seconds. score: 0.88 1991576 nodes. >ply 9. b6+ 27 seconds. score: 0.88 2143929 nodes. >ply 10. b6+ 42 seconds. score: 0.88 3356153 nodes. >ply 11. b6+ 134 seconds. score: 0.88 10762624 nodes. >ply 11. b6+ 263 seconds. score: -0.22 21258851 nodes. >ply 12. b6+ 300 seconds. score: -0.22 24347463 nodes. >81152.8 nodes/second. >5654957 regular nodes, 18692506 quiescence nodes. >5244878 searches of hash table, 1296855 successful (24 percent). >499999 hash entries inserted, 969461 entries replaced, 3087251 inserts failed. >search: b6+ 300 seconds. score: -0.22 24347463 nodes. ++ correct >b6+ Ka4 Rxe5 Qh1 Rxf5 Qh2+ Ke1 Qg1+ Kd2 Qd4+ Bd3 Rb2+ Kc1 Qc3+ After Qc3+ (last move of PV), white is mated next move! > >On the 2nd position, it likes Rxg7+ but only gives a score of +0.88. >Something is wacky if you were getting +2. Not that wacky. If you look at your PV, you will see that it leads to a position where BLACK could resign. I'm guessing that my program saw that your line was good for white, so concluded that Bxb7 wasn't any good. Therefore it saw that Bc8 wasn't any good for black, it just didn't see deeply enough to see that Qh1!! is much better than Bc8. How long for your program to see in this position that Rxg7+ Kb6 Rb7+ Ka5 b6+ Ka4 Rxe5 Bc8 isn't so good for black? I was impressed by Insomniac's analysis on this position. > >ply 1. Rxb1 0 seconds. score: -3.63 2 nodes. >ply 1. Rxb1 0 seconds. score: -0.30 39 nodes. >ply 2. Rxb1 0 seconds. score: -0.30 298 nodes. >ply 3. Rxb1 0 seconds. score: -0.23 1097 nodes. >ply 4. Rxb1 0 seconds. score: -0.31 4354 nodes. >ply 5. Rxb1 0 seconds. score: -0.48 17688 nodes. >ply 6. Rxg7+ 0 seconds. score: 0.14 26307 nodes. >ply 6. Rxg7+ 0 seconds. score: 1.64 36226 nodes. >ply 7. Rxg7+ 1 seconds. score: 1.64 84263 nodes. >ply 7. Rxb1 2 seconds. score: -0.28 144308 nodes. >ply 7. Rxb1 2 seconds. score: -0.28 174156 nodes. >ply 8. Rxg7+ 3 seconds. score: 0.34 261838 nodes. >ply 8. Rxg7+ 5 seconds. score: 1.45 359267 nodes. >ply 9. Rxg7+ 12 seconds. score: 1.48 924513 nodes. >ply 10. Rxg7+ 26 seconds. score: 1.38 2116329 nodes. >ply 11. Rxg7+ 90 seconds. score: 0.88 7383494 nodes. >ply 12. Rxg7+ 152 seconds. score: 0.88 12609737 nodes. >ply 13. Rxg7+ 300 seconds. score: 0.88 24420946 nodes. >81397.7 nodes/second. >5779819 regular nodes, 18641127 quiescence nodes. >5316305 searches of hash table, 1503675 successful (28 percent). >499999 hash entries inserted, 1052518 entries replaced, 2989714 inserts failed. >search: Rxg7+ 300 seconds. score: 0.88 24420946 nodes. ++ correct >Rxg7+ Kb6 Rb7+ Ka5 b6+ Ka4 Rxe5 Bc8 Re8 Bxb7 axb7 Rxb6 Ra8+ Kb3 b8=Q Rxb8
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