Author: Uri Blass
Date: 13:50:57 08/19/01
Go up one level in this thread
On August 19, 2001 at 02:57:37, Slater Wold wrote: >On August 18, 2001 at 15:18:32, Sune Larsson wrote: > >> >> [D]8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1 >> >> Ortueta - Sanz, 1934 >> >> >> This position might prove to be a good test. Deep Fritz had some problems >> here. Found the correct move after 13:14 with -0.28, then went green >> after 35:39 with -2.47. PIII 800 - 64 MB Hash. >> >> Black wins after 1.-Rxb2! 2.Nxb2 c3 3.Rxb6 c4! 4.Rb4 a5! True Pawn Magic!! >> >> >> Ortueta - Sanz >> 8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1 >> >> Analysis by Deep Fritz: PIII 800 Mhz >> >> >>1...Bd8 2.Rxa7 Bf6 3.Rb7 Bd4+ 4.Kf1 Rf2+ 5.Ke1 Rxg2 6.h3 >> = (0.19) Depth: 8/20 00:00:00 67kN >>1...Bd8 2.Rxa7 Bf6 3.Kf1 Bxb2 4.Nxb2 Rxb2 5.a4 c3 6.a5 >> = (0.22) Depth: 9/20 00:00:00 123kN >>1...c3! >> = (0.19) Depth: 9/20 00:00:00 149kN >>1...c3! 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4 >> = (0.06) Depth: 9/24 00:00:00 161kN >>1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4 Rc3 6.Kf2 Rxc4 >> = (0.06) Depth: 10/26 00:00:00 242kN >>1...Bd8! >> = (0.03) Depth: 10/27 00:00:01 382kN >>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.Rxa7 Bxb2 5.Nxb2 Rxb2 6.a4 c3 7.a5 >> = (-0.03) Depth: 11/25 00:00:02 1076kN >>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.a3 Bd4 5.g4 Rh2 6.Rxa7 Bxb2 >> = (-0.06) Depth: 12/27 00:00:03 2041kN >>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.g4 Rh2 5.Rxa7 Bxb2 6.Nxb2 Rxb2 7.a4 >> = (-0.03) Depth: 13/28 00:00:07 4281kN >>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.a3 a6 5.Rb6 Kf5 6.Nxc5 Bxb2 7.Rxa6 >> = (-0.06) Depth: 14/31 00:00:13 8712kN >>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.a3 Bd4 5.g4 Rh2 6.Rxa7 Rxh3 7.Re7 >> = (-0.16) Depth: 15/32 00:00:36 23307kN >>1...Bd8 2.h3 Bf6 3.Kf1 Kg6 4.g4 Rh2 5.Rxa7 Bxb2 6.Nxb2 Rxb2 7.Ra6+ >> = (-0.16) Depth: 16/34 00:01:27 56494kN >>1...c3! >> = (-0.19) Depth: 16/34 00:01:33 60739kN, tb=4 >>1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4 Rc3 6.Kf2 Rxc4 7.Re6 >> = (-0.19) Depth: 17/37 00:02:08 84446kN, tb=19 >>1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.Rxb6 Ra3 5.c4 Rc3 6.Kf2 Rxc4 7.Re6 >> = (-0.22) Depth: 18/36 00:04:21 173788kN, tb=70 >>1...Bd8! >> = (-0.25) Depth: 18/37 00:11:10 443095kN, tb=84 >>1...Rxb2! >> ³ (-0.28) Depth: 18/38 00:13:14 527020kN, tb=84 >>1...Rxb2! 2.Nxb2 c3 3.Rxb6 c4 4.Rb4 a5 5.Rb5 c2 6.Kf2 c1Q 7.Ke2 >> -+ (-2.47) Depth: 18/38 00:35:39 1415072kN, tb=108 >> >>(Larsson, KIL 18.08.2001) > > >hash table memory = 48M bytes. >pawn hash table memory = 10M bytes. >5 piece tablebase files found >20386kb of RAM used for TB indices and decompression tables >EGTB cache memory = 16M bytes. > > >Crafty v18.10 (1 cpus) > >White(1): force >White(1): setboard 8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1 > > +---+---+---+---+---+---+---+---+ > 8 | | | | | | | | | > +---+---+---+---+---+---+---+---+ > 7 | *P| R | | | | | *P| *K| > +---+---+---+---+---+---+---+---+ > 6 | | *B| | | | | | | > +---+---+---+---+---+---+---+---+ > 5 | | | *P| | | | | | > +---+---+---+---+---+---+---+---+ > 4 | N | | *P| | | | | | > +---+---+---+---+---+---+---+---+ > 3 | | | | | | | | | > +---+---+---+---+---+---+---+---+ > 2 | P | P | | *R| | | P | P | > +---+---+---+---+---+---+---+---+ > 1 | | | | | | | K | | > +---+---+---+---+---+---+---+---+ > a b c d e f g h > >Black(1): name Administrator >Crafty 18.10 vs Administrator >Black(1): time 180000 >time remaining: 30:00 (crafty). >Black(1): otim 180000 >time remaining: 30:00 (opponent). >Black(1): go >end-game phase > clearing hash tables > time surplus 0.00 time limit 30:00 (15:00) > nss depth time score variation (1) > 7 0.19 0.50 1. ... Bd8 2. Rxa7 Bf6 3. Rf7 Bxb2 > 4. Nxb2 Rxb2 5. a4 > 7-> 0.20 0.50 1. ... Bd8 2. Rxa7 Bf6 3. Rf7 Bxb2 > 4. Nxb2 Rxb2 5. a4 > 8 0.34 0.26 1. ... Bd8 2. Rxa7 Bf6 3. Rb7 Bd4+ > 4. Kf1 Rf2+ 5. Ke1 Rxg2 6. h4 > 8-> 0.42 0.26 1. ... Bd8 2. Rxa7 Bf6 3. Rb7 Bd4+ > 4. Kf1 Rf2+ 5. Ke1 Rxg2 6. h4 > 9 0.67 0.01 1. ... Bd8 2. Rxa7 Bf6 3. Rb7 Bd4+ > 4. Kf1 Rf2+ 5. Ke1 Rxg2 6. h4 Rf2 > 9-> 0.81 0.01 1. ... Bd8 2. Rxa7 Bf6 3. Rb7 Bd4+ > 4. Kf1 Rf2+ 5. Ke1 Rxg2 6. h4 Rf2 > 10 1.53 0.04 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g4 a6 5. Ke1 Rh2 6. Rb6 > 10-> 1.97 0.04 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g4 a6 5. Ke1 Rh2 6. Rb6 > 11 3.50 -0.07 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > Rxa7 Rf2+ 5. Ke1 Rxg2 6. Rb7 Rh2 7. > Rb5 > 11-> 4.08 -0.07 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > Rxa7 Rf2+ 5. Ke1 Rxg2 6. Rb7 Rh2 7. > Rb5 > 12 7.09 -0.09 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Rf2+ 5. Ke1 Rh2 6. Rxa7 Bxb2 7. > Nxb2 Rxb2 8. Ra5 <HT> > 12-> 8.29 -0.09 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Rf2+ 5. Ke1 Rh2 6. Rxa7 Bxb2 7. > Nxb2 Rxb2 8. Ra5 <HT> > 13 18.58 -0.17 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Kg6 5. a3 Rf2+ 6. Ke1 Rh2 7. g4 > a6 8. Rb6+ Kg5 > 13-> 21.90 -0.17 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Kg6 5. a3 Rf2+ 6. Ke1 Rh2 7. g4 > a6 8. Rb6+ Kg5 > 14 43.61 -0.17 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g4 Rh2 5. Rxa7 Bxb2 6. Nxb2 Rxb2 7. > Ra5 c3 8. Rxc5 c2 9. a4 > 14-> 51.39 -0.17 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g4 Rh2 5. Rxa7 Bxb2 6. Nxb2 Rxb2 7. > Ra5 c3 8. Rxc5 c2 9. a4 > 15 2:41 -0.36 1. ... Bd8 2. Kf1 Bf6 3. h4 Bxh4 4. > Rxa7 c3 5. Nxc3 Rf2+ 6. Kg1 Rxb2 7. > Rc7 Bf6 8. Ne4 Bd4+ 9. Kf1 Rxa2 10. > Nxc5 Bxc5 11. Rxc5 > 15 3:33 ++ 1. ... Rxb2!! > (2) 15-> 5:02 -0.75 1. ... Rxb2 > 16 6:32 ++ 1. ... Rxb2!! >Black(0): ? > time=10:10 cpu=99% mat=0 n=507729008 fh=16% nps=831k > ext-> chk=47370576 cap=408675 pp=1112610 1rep=2420213 mate=67061 > predicted=0 nodes=507729008 evals=94120254 > endgame tablebase-> probes done=117 successful=117 > hashing-> trans/ref=15% pawn=7% used=99% > SMP-> split=0 stop=0 data=0/64 cpu=10:10 elap=10:10 >Black(1): Rxb2 > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >max threads set to 2 >hash table memory = 48M bytes. >pawn hash table memory = 10M bytes. >5 piece tablebase files found >20386kb of RAM used for TB indices and decompression tables >EGTB cache memory = 16M bytes. > > >Crafty v18.10 (2 cpus) > >White(1): force >White(1): setboard 8/pR4pk/1b6/2p5/N1p5/8/PP1r2PP/6K1 b - - 0 1 > > +---+---+---+---+---+---+---+---+ > 8 | | | | | | | | | > +---+---+---+---+---+---+---+---+ > 7 | *P| R | | | | | *P| *K| > +---+---+---+---+---+---+---+---+ > 6 | | *B| | | | | | | > +---+---+---+---+---+---+---+---+ > 5 | | | *P| | | | | | > +---+---+---+---+---+---+---+---+ > 4 | N | | *P| | | | | | > +---+---+---+---+---+---+---+---+ > 3 | | | | | | | | | > +---+---+---+---+---+---+---+---+ > 2 | P | P | | *R| | | P | P | > +---+---+---+---+---+---+---+---+ > 1 | | | | | | | K | | > +---+---+---+---+---+---+---+---+ > a b c d e f g h > >Black(1): name Administrator >Crafty 18.10 vs Administrator >Black(1): time 180000 >time remaining: 30:00 (crafty). >Black(1): otim 180000 >time remaining: 30:00 (opponent). >Black(1): go >end-game phase > clearing hash tables > time surplus 0.00 time limit 30:00 (15:00) > nss depth time score variation (1) >starting thread 1 > 7-> 0.13 0.50 1. ... Bd8 2. Rxa7 Bf6 3. Rf7 Bxb2 > 4. Nxb2 Rxb2 5. a4 > 8 0.19 0.26 1. ... Bd8 2. Rxa7 Bf6 3. Rb7 Bd4+ > 4. Kf1 Rf2+ 5. Ke1 Rxg2 6. h4 > 8 0.24 -0.12 1. ... Rxb2 2. Nxb2 c3 3. Nd3 c4+ 4. > Rxb6 axb6 5. Nf4 b5 > (3) 8-> 0.24 -0.12 1. ... Rxb2 2. Nxb2 c3 3. Nd3 c4+ 4. > Rxb6 axb6 5. Nf4 b5 > 9 0.24 -- 1. ... Rxb2 > (2) 9 0.27 0.67 1. ... Rxb2 2. Nxb2 c3 3. Rxb6 axb6 > 4. Nd3 Kg6 5. a4 Kf5 > 9 0.38 ++ 1. ... Bd8!! > 9 0.61 0.10 1. ... Bd8 2. Kf1 Bf6 3. Rxa7 Bxb2 > 4. Nxb2 Rxb2 5. a4 Ra2 6. a5 > 9-> 0.69 0.10 1. ... Bd8 2. Kf1 Bf6 3. Rxa7 Bxb2 > 4. Nxb2 Rxb2 5. a4 Ra2 6. a5 > 10 1.07 0.04 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g4 Rh2 5. Ke1 a6 6. Rb6 > 10-> 1.29 0.04 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g4 Rh2 5. Ke1 a6 6. Rb6 > 11 2.21 -0.07 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > Rxa7 Rf2+ 5. Ke1 Rxg2 6. Rb7 Rh2 7. > Rb5 > 11-> 2.55 -0.07 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > Rxa7 Rf2+ 5. Ke1 Rxg2 6. Rb7 Rh2 7. > Rb5 > 12 5.16 -0.09 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Rf2+ 5. Ke1 Rh2 6. Rxa7 Bxb2 7. > Nxb2 Rxb2 8. Ra5 <HT> > 12-> 5.88 -0.09 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Rf2+ 5. Ke1 Rh2 6. Rxa7 Bxb2 7. > Nxb2 Rxb2 8. Ra5 <HT> > 13 13.55 -0.17 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Kg6 5. a3 Rf2+ 6. Ke1 Rh2 7. g4 > a6 8. Rb6+ Kg5 > 13-> 15.30 -0.17 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Kg6 5. a3 Rf2+ 6. Ke1 Rh2 7. g4 > a6 8. Rb6+ Kg5 > 14 25.68 -0.17 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g4 Rh2 5. Rxa7 Bxb2 6. Nxb2 Rxb2 7. > Ra5 c3 8. Rxc5 c2 9. a4 > 14-> 29.54 -0.17 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g4 Rh2 5. Rxa7 Bxb2 6. Nxb2 Rxb2 7. > Ra5 c3 8. Rxc5 c2 9. a4 > 15 1:25 -0.25 1. ... Bd8 2. Kf1 Bf6 3. h3 Bd4 4. > g3 Rf2+ 5. Ke1 Rf3 6. Rxa7 Rxg3 7. > Rf7 Rg2 8. Kd1 Bxb2 9. Nxc5 > 15 1:52 ++ 1. ... Rxb2!! > 15 3:19 -1.93 1. ... Rxb2 2. Nxb2 c3 3. Rxb6 c4 4. > Rb4 a5 5. Rb5 c2 6. g4 c1=Q+ 7. Kg2 > c3 8. Rh5+ Kg6 9. Nc4 Qc2+ 10. Kf3 > Qxa2 11. Nxa5 > (2) 15-> 3:19 -1.93 1. ... Rxb2 2. Nxb2 c3 3. Rxb6 c4 4. > Rb4 a5 5. Rb5 c2 6. g4 c1=Q+ 7. Kg2 > c3 8. Rh5+ Kg6 9. Nc4 Qc2+ 10. Kf3 > Qxa2 11. Nxa5 >Black(0): ? > time=4:02 cpu=210% mat=0 n=368346060 fh=89% nps=1521k > ext-> chk=23467910 cap=366896 pp=962906 1rep=1135472 mate=77247 > predicted=0 nodes=368346060 evals=95924812 > endgame tablebase-> probes done=110 successful=110 > hashing-> trans/ref=34% pawn=7% used=99% > SMP-> split=1510 stop=212 data=9/64 cpu=8:29 elap=4:02 >Black(1): Rxb2 > time used: 4:02 > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >Bob, is there anyway to speed this up? Granted, Deep Fritz would have to have >10x this hardware to find it in the amount of time Crafty did on 1 of my 1.7Ghz >CPU's, this _IS_ a pretty obvious move. > >GT 2.0 and CT 14.0 both find it in less than 10 seconds on one of my 1.7Ghz >CPU's. 1:52 on 2x1.7Ghz is not good. Deep Shredder found it on 2x1.7Ghz in >less than 30 seconds. And well, with Deep Fritz's AWEFUL endgame, it can't find >it in any reasonable amount of time. > >Do you have any ideas how you might fix this? Or is this a problem, where any >attempt to find it faster, may result in a lowered performance elsewhere? It is easy to find it faster by increasing the value of passed pawns or evaluating 2 pawns in the 6th as better than a rook. The problem may be in other positions when 2 pawns on the 6th do not win because the opponent king is too close. I remember that previous Crafty versions solved it faster. It does not mean that they were better. > >Thanks! > > >Slate > >PS I got an 1800 player to look at this position on ICC, and in less than 10 >seconds, he kibitzed, "Rxd2!" I guess that you mean Rxb2 I believe that he simply knows it because Rxb2 is a famous move. I read this move in a chess book when I was an unrated player. Uri
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