Author: Robert Hyatt
Date: 10:47:13 03/24/03
Go up one level in this thread
On March 24, 2003 at 11:40:47, Uri Blass wrote: >On March 24, 2003 at 11:13:12, Vincent Diepeveen wrote: > >>On March 23, 2003 at 15:19:27, Alexander Kure wrote: >> >>>Hi everybody, >>> >>>I found an interesting position taken from one of my games when i was an active >>>tournament player in the 1990ies: >>> >>>[d]8/p3b3/1k6/4p2p/K1Pp2pP/3P2P1/3N4/8 b - - 0 1 >>> >>>Here i played the stunning Bxh4! >>>The idea is that black will force 3 passed pawns that can not be stopped by >>>white's knight and king. >>> >>>A possible continuation will be: >>>1...Bxh4 2. gxh4 g3 3. Nf3 g2 4. Kb4 a5 5. Kb3 Kc5 6. Ng1 e4 7. dxe4 a4 >>>and the 3 black passers are too much for white to handle. >>> >>>I am interested in which programs will find this solution. >> >>Without nullmove perhaps some will, by default i have nullmove turned >>on though. >> >>Very cool sacrafice! >> >>i had played quickly: >> bxh4 gh g3 c5 kc6 kb4 a5! kc4 g2 nf3 kb7 kb3 > >Yace does not like Kb3 in that line Kb3 loses the entire world. By the time Crafty reaches depth=17 the score is -3.0 and dropping every iteration. Depth18=-3.45 and so forth. Whether Ng1 is enough to draw I don't know as I haven't had time to analyze every possibility. Shallow searches (17 plies) sayd Kc7 after Ng1, with a score of -3.69. At depth=18 score=-3.59... That is as far as I could go before class... > >It says > >depth=21 -0.41 t 7.Ng1 Kc7 8.Nh3H Kc6H 9.Ng1H a4H 10.Kb4H e4H 11.Kxa4H exd3H >12.Kb3H Kxc5H 13.Kb2H Kd5H 14.Kc1H Ke5H 15.Kd2H Ke4H 16.Nh3H Kf3H 17.Kxd3H Kg4H >18.Ng1H Kxh4H 19.Kxd4H {HT} {180} >Nodes: 56578747 NPS: 527639 >Time: 00:01:47.23 >depth=21 -0.41 . 7.Ng1 Kc7 8.Nh3 Kc6 9.Ng1 a4 10.Kb4 e4 11.Kxa4 exd3 12.Kb3 >Kxc5 13.Kb2 Kd5 14.Kc1 Ke5 15.Kd2 Ke4 16.Nh3 Kf3 17.Kxd3 Kg4 18.Ng1 Kxh4 19.Kxd4 >{HT} {180} >Nodes: 116484437 NPS: 505245 >depth=22 -0.31 t 7.Ng1 Kc7 8.Nh3 Kc6 9.Ng1 a4 10.Kb4 e4H 11.Kxa4H exd3H 12.Kb3H >Kxc5H 13.Kb2H Kd5H 14.Kc1H Ke5H {HT} >Nodes: 149645128 NPS: 516552 >Time: 00:04:49.70 >Time: 00:03:50.55 > >After Kb3? it says > >depth=18 +0.32 t+ 7...Ka6 8.Nxd4 g1=Q 9.c6 >Nodes: 15934691 NPS: 559897 >Time: 00:00:28.46 >depth=18 +0.71 ++ 7...Ka6 8.Nxd4 g1=Q 9.c6 >Nodes: 26248886 NPS: 544469 >Time: 00:00:48.21 >depth=18 +1.54 t 7...Ka6 8.Ng1 Kb5 9.c6 Kxc6 10.Kc4 Kd6 11.Ne2 Ke6 12.Kb5 e4H >13.Kc4H Ke5H 14.Kc5H exd3H 15.Ng1H Ke4H 16.Nf3H d2H {HT} {-20} >Nodes: 34887272 NPS: 535327 >Time: 00:01:05.17 >depth=18 +1.54 . 7...Ka6 8.Ng1 Kb5 9.c6 Kxc6 10.Kc4 Kd6 11.Ne2 Ke6 12.Kb5 e4 >13.Kc4 Ke5 14.Kc5 exd3 15.Ng1 Ke4 16.Nf3 d2 {HT} {-20} >Nodes: 47931301 NPS: 539281 >Time: 00:01:28.88 >depth=19 +1.61 t 7...Ka6 8.Ng1 Kb5 9.c6 Kxc6 10.Kc4 Kd6 11.Nf3 Ke6 12.Ng1 Kf5 >13.Kc5 Kg4 14.Kc4H Kg3H 15.Kd5H {HT} {-100} >Nodes: 60731982 NPS: 532596 >Time: 00:01:54.03 >depth=19 +1.61 . 7...Ka6 8.Ng1 Kb5 9.c6 Kxc6 10.Kc4 Kd6 11.Nf3 Ke6 12.Ng1 Kf5 >13.Kc5 Kg4 14.Kc4 Kg3 15.Kd5 {HT} {-100} >Nodes: 82105333 NPS: 536320 >Time: 00:02:33.09 >depth=20 +1.76 t 7...Ka6 8.Ng1 Kb5 9.c6 Kxc6 10.Kc4 Kd6 11.Nf3 Ke6 12.Ng1 Kf5 >13.Kc5 Kg4 14.Kd5 a4 15.Kc4 {HT} {-100} >Nodes: 109892425 NPS: 527897 >Time: 00:03:28.17 > >Uri
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