Pins and wins - Kaplan-Bronstein Hastings 1975/76

Discussion of anything and everything relating to chess playing software and machines.

Moderator: Ras

Allard Siemelink
Posts: 297
Joined: Fri Jun 30, 2006 9:30 pm
Location: Netherlands

Re: Pins and wins - Kaplan-Bronstein Hastings 1975/76

Post by Allard Siemelink »

50 seconds for bright:

Code: Select all

 [18/35]   31.859   67066k     106  ok/2.9
 [19/36]   36.734   77861k     103  Kg8g7 c3c4 Kg7f6 c2c3 Rd8xd2 Rd1xd2 Kf6e5 Kc1d1 Bh6xd2 Kd1xd2 Ke5f4 g2g4 b7b6 Kd2e2 Kf4g3 Ke2e3 Kg3xh3 Ke3f3 f7f6 a2a4 Kh3h4 Kf3f4 h7h6

 [19/36]   42.484   90166k     104  ++10/27 c5c4
 [19/37]   50.031     104m     229  c5c4 a2a3 Kg8g7 a3a4 Rd8d5 a4a5 f7f5 h3h4 Bh6e3 h4h5 Kg7h6 g2g3 Rd5xa5 Kc1b2 Be3xd2 Rd1xd2 Kh6xh5 Rd2d7 Ra5b5+ Kb2a3 Kh5g4
 [19/37]   51.750     109m     229  ok/1.7
 [20/40]  0:01:16     158m     449  c5c4 a2a3 Kg8g7 a3a4 Rd8d5 a4a5 f7f5 h3h4 Bh6e3 g2g3 h7h5 Kc1b2 Be3xd2 Kb2a3 Rd5xa5+ Ka3b4 Ra5d5 Kb4xc4 Rd5d6 Rd1b1 b7b6
 [20/40]  0:01:29     187m     449  ok/1.7
Albert Silver wrote:
Vinvin wrote:
Marc MP wrote:5rk1/pp3p1p/7b/2pR4/8/2P4P/P1PNr1P1/2K4R b - - 1 1[/D]

After 1... Rxd2! 2. Rxd2 Rd8 3. Rd1 c4! black wins because white will run out of a-g-h pawn moves and will have to move the king, losing the rook on d2. Is there an engine able to find this ?
After 1... Rxd2! 2. Rxd2 Rd8 3. Rd1, Toga II 1.4 beta5c needs 13m51s to give more than -3 to 3...c4! :

[d]3r2k1/pp3p1p/7b/2p5/8/2P4P/P1PR2P1/2KR4 b - - 0 1

Analysis by Toga II 1.4 beta5c:

3...Rg7 4.c4 Rg6 5.g3 Rf5 6.g4+ Rg6 7.c3 Txd2 8.Txd2 Fxd2+ 9.Rxd2 Rg5 10.a4 Rh4 11.Re3 Rxh3
µ (-0.92) Profondeur: 12/21 00:00:01 140kN

3...Rg7 4.a3 Rg6 5.a4 b6 6.c4 Td4 7.c3 Txc4 8.Rb2 Fxd2 9.Txd2 Txa4 10.Td6+ Rg7 11.Rb3 Te4 12.Td7 a5 13.Tb7 Te6 14.Ra4 Rg6 15.Rb5 f5 16.Tb8 Rf6 17.Td8 Re7 18.Tb8 h5 19.Txb6
-+ (-1.67) Profondeur: 26/61 00:07:52 700mN
3...c4 4.h4 Ff4 5.g3 Fh6 6.g4 Ff4 7.h5 b5 8.g5 b4 9.cxb4 c3 10.Tg1 cxd2+ 11.Rd1 Td5 12.g6 Txh5 13.gxh7+ Rxh7 14.c4 Th4 15.Re2 Fh6 16.Rd3 Tg4 17.Th1 Rg6 18.b5 Rf5
-+ (-3.42) Profondeur: 26/69 00:13:51 1118mN
3...c4 4.g4 Ff4 5.h4 b5 6.a3 a5 7.g5 b4 8.axb4 axb4 9.cxb4 c3 10.Rb1 Txd2 11.Tf1 Fd6 12.Te1 Fxb4 13.Te4 Fd6 14.Te3 Td4 15.Txc3 Txh4 16.Tb3 Th1+ 17.Ra2 Th2 18.Rb1
-+ (-3.45) Profondeur: 26/69 00:14:15 1132mN
3...c4 4.h4 Ff4 5.g3 Fh6 6.g4 Ff4 7.h5 b5 8.g5 b4 9.cxb4 c3 10.Tg1 cxd2+ 11.Rd1 Td5 12.a3 Txg5 13.Txg5+ Fxg5 14.c4 Rg7 15.c5 f5 16.a4 Rf6 17.c6 Ff4 18.b5 Re6 19.Re2
-+ (-3.48) Profondeur: 27/69 00:17:44 1205mN
Rybka Winfinder on an Athlon64 2.2GHz with 512MB hash takes 3 minutes 25 seconds:

[-2.70] d=24 3...c4 4.g4 Be3 5.h4 b5 6.a3 a5 7.g5 b4 8.axb4 axb4 9.cxb4 c3 10.Kb1 (0:03.50)
[-2.70] d=23 3...c4 4.g4 Be3 5.h4 b5 6.a3 a5 7.g5 b4 8.axb4 axb4 9.cxb4 c3 10.Kb1 (0:03.25)
[-1.00] d=23 3...Kg7 4.c4 Kf6 5.c3 Rxd2 6.Rxd2 Ke5 7.Kc2 Bxd2 8.Kxd2 Kf4 9.Ke2 Kg3 10.Kf1 (0:02.43)
[-0.90] d=22 3...Kg7 4.c4 Kf6 5.c3 Rxd2 6.Rxd2 Ke5 7.Kc2 Bxd2 8.Kxd2 Kf4 9.Ke2 Kg3 10.Kf1 (0:01.34)
[-0.80] d=21 3...Kg7 4.c4 Kf6 5.c3 Rxd2 6.Rxd2 Ke5 7.Kc2 Bxd2 8.Kxd2 Kf4 9.Ke2 Kg3 10.Kf1 (0:00.52)
[-0.80] d=20 3...Kg7 4.c4 Kf6 5.c3 Rxd2 6.Rxd2 Ke5 7.Kc2 Bxd2 8.Kxd2 Kf4 9.Ke2 Kg3 10.Kf1 (0:00.35)
[-0.70] d=19 3...Kg7 4.c4 Rd4 5.c3 Bxd2 6.Rxd2 Rxc4 7.Kb2 (0:00.23)
[-0.50] d=19 3...Rd6 4.c4 Kg7 5.c3 Kf6 6.Rf1 Ke6 7.Re1 Kf5 8.Rf1 Kg6 9.Rff2 Rxd2 10.Rxd2 (0:00.14)
[-0.50] d=18 3...Rd6 4.c4 Kg7 5.c3 Kf6 6.Rf1 Ke6 7.Re1 Kf5 8.Rf1 Kg6 9.Rff2 Rxd2 10.Rxd2 (0:00.10)
[-0.50] d=17 3...Rd6 4.c4 Kg7 5.c3 Kf6 6.Rf1 Ke6 7.Re1 Kf5 8.Rf1 Kg6 9.Rff2 Rxd2 10.Rxd2 (0:00.06)
[-0.50] d=16 3...Rd6 4.c4 Kg7 5.c3 Kf6 6.Rf1 Ke6 7.Re1 Kf5 8.Rf1 Kg6 9.Rff2 Rxd2 10.Rxd2 (0:00.04)
[-0.50] d=15 3...Rd6 4.c4 Kg7 5.c3 Kf6 6.Rf1 Ke6 7.Re1 Kf5 8.Rf1 Kg6 9.Rff2 Rxd2 10.Rxd2 (0:00.03)
[-0.50] d=14 3...Rd6 4.c4 Kg7 5.c3 Kf6 6.Rf1 Ke6 7.Re1 Kd7 8.Ree2 Rxd2 9.Rxd2 Ke6 (0:00.02)
[-0.60] d=13 3...Rd6 4.g4 Kg7 5.g5 Bxg5 6.Rg1 Rg6 7.Rxg5 Rxg5 8.Rd7 (0:00.01)
[-0.60] d=12 3...Rd6 4.g4 Kg7 5.h4 Bf4 6.a3 c4 7.a4 (0:00.00)
[-0.50] d=11 3...Rd6 4.g4 Kg7 5.h4 Bf4 6.a3 c4 (0:00.00)
[-0.40] d=11 3...Kg7 4.a3 f5 5.c4 Kf6 6.c3 Rxd2 (0:00.00)
[-0.50] d=10 3...Kg7 4.a4 f5 5.c4 Rd4 6.c3 (0:00.00)
[-0.50] d=9 3...Kg7 4.g4 f5 5.gxf5 Kf6 (0:00.00)
[-0.40] d=8 3...Kg7 4.h4 Bxd2 5.Rxd2 Rxd2 6.Kxd2 Kf6 7.Kd3 (0:00.00)
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shiv
Posts: 351
Joined: Sat Apr 01, 2006 2:03 am

Re: Pins and wins - Kaplan-Bronstein Hastings 1975/76

Post by shiv »

Regarding the problem difficulty - for computers it is much harder. Give most computer programs 5 minutes and it will not find the best win.

For humans, the temptation to keep pinning the piece on d2 is quite high. The only way for white to break free is to play c4, c3, and Kc2. .. c4! prevents that from occurring. Geometrically, there is no way to prevent the loss of a piece with white's limited waiting moves. I think for a strong human player, this kind of plan should not be supremely difficult to find especially as most humans are taught to maintain pins for as long as possible. Some players might even find c4 after reaching the position right before it.

A computer will try to solve the problem via brute force, working out all possibilities and missing out on the virtual zugzwang.

The reasoning that ..c4 prevents c4, c3, and Kc2 - white's only reasonable plan in the position - is beyond a computer's horizon of thinking.
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Dann Corbit
Posts: 12777
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Pins and wins - Kaplan-Bronstein Hastings 1975/76

Post by Dann Corbit »

This one is really interesting, because there is nothing to it but a pin and battery. I am very surprised that chess engines cannot see it after two plies, because it seems easy. I guess knowing the solution might make it seem easier than it is, but it seems an obvious move to me. After the key move is made, it takes about 3 minutes to see the trouble. The king is a necessary defender for the piece, so it seems clear that there is no escape right away.

Code: Select all

[d]5rk1/pp3p1p/7b/2pR4/8/2P4P/P1PNr1P1/2K4R b - - bm Rxd2; c0 "Julio P Kaplan vs David Bronstein at Hastings, 1975"; id "kbp0";
Analysis from E:\toast.epd   
4/1/2008 7:10:25 PM Level: 600 Seconds
Analyzing engine: Rybkav2.3.2a.w32

1) Rxd2; c0 "Julio P Ka 
    Searching move: Re2xd2
    Best move (Rybkav2.3.2a.w32): Re2xg2
    Not found in: 10:00
      5	00:08	       3.102	28.616	+1.48	Re2xg2 Rd5d6
      6	00:09	       3.902	31.711	+1.49	Re2xg2 Rd5d6 Bh6f4
      7	00:09	       5.649	40.736	+1.45	Re2xg2 Rd5d6 Bh6f4 Rd6d7
      8	00:09	       9.665	52.364	+1.46	Re2xg2 Rd5d6 Kg8g7 Rh1e1 Bh6f4
      9	00:09	      26.383	61.540	+1.65	Re2xg2 Rh1d1 Rf8e8 Kc1b2 Re8e2 Nd2f3
     10	00:09	      50.710	66.318	+1.75	Re2xg2 Rh1d1 Rf8e8 c3c4 Re8e2 c2c3 Kg8g7
     11	00:09	      79.271	70.098	+1.74	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4
     12	00:09	      93.482	70.334	+1.74	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6
     13	00:09	     126.408	72.597	+1.75	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 Rd5d7
     14	00:36	     209.446	69.997	+1.55	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 Rd5d8+ Bh6f8 Nf3e5
     15	00:36	     369.513	67.255	+1.51	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 Rd5xc5 Rg2f2 Nf3e5 Bh6f4 a2a3
     16	00:36	     584.421	69.001	+1.73	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 Rd5d7 Bh6f4 Nf3h4
     17	01:12	     901.973	71.471	+1.76	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 Rd5d7 a7a5 Rd7b7
     18	02:02	   1.511.553	69.269	+1.61	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 a4a5 Rg2f2 Nf3e5
     19	02:53	   2.358.985	69.887	+1.67	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 a4a5 Rg2f2 Nf3e5
     20	03:15	   3.758.796	71.379	+1.71	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 a4a5 Rg2f2 Nf3e5
     21	03:55	   6.455.681	67.898	+1.64	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 a4a5 Rg2f2 Nf3e5
     22	04:41	  10.601.506	66.447	+1.64	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 a2a4 b7b6 a4a5 Rg2f2 Nf3e5
     23	06:51	  26.173.138	66.000	+1.57	Re2xg2 Kc1d1 Rf8e8 Nd2f3 Re8e2 Rh1g1 Re2xc2 Rg1xg2+ Rc2xg2 Rd5xc5 Rg2xa2 Rc5c8+ Bh6f8 Nf3d4
   4/1/2008 7:21:19 PM, Time for this analysis: 00:10:49, Rated time: 10:00

[d]5rk1/pp3p1p/7b/2pR4/8/2P4P/P1Pr2P1/2K4R w - - bm Rxd2; c0 "Julio P Kaplan vs David Bronstein at Hastings, 1975"; id "kbp1";
2) Rxd2; c0 "Julio P Ka 
    Searching move: Rd5xd2
    Best move (Rybkav2.3.2a.w32): Rd5xd2
    identical moves! Found in: 00:18
      5	00:08	         472	483.328	-0.17	Rd5xd2 Kg8g7
      6	00:18	       2.293	146.752	-0.31	Rd5xd2 Rf8d8 Rh1d1
      7	00:23	       2.798	89.536	-0.17	Rd5xd2 Rf8d8 Rh1d1 Kg8g7
      8	00:34	       3.135	100.320	-0.20	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a4
      9	00:39	       6.127	79.418	-0.24	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a4 f7f5
     10	00:49	       8.687	80.868	-0.47	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 a3a4
     11	00:49	      10.053	81.700	-0.42	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 g2g3 f7f5 a2a4 Kg7f6
     12	00:52	      12.727	75.332	-0.43	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 a3a4 Kg7f6 a4a5
     13	00:52	      15.569	72.466	-0.46	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 a3a4 Kg7f6 g2g3 Rd8g8
     14	00:52	      21.589	70.629	-0.46	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 Kf6e5
     15	00:52	      27.957	67.678	-0.47	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 Kf6e5
     16	00:52	      45.264	68.871	-0.62	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4
     17	00:52	      71.775	70.131	-0.63	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4
     18	00:52	     112.320	70.088	-0.63	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4
     19	00:52	     182.574	70.789	-0.63	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 Kf6e5
     20	02:02	     305.529	70.242	-0.63	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4
     21	03:07	     561.828	73.484	-0.65	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 Kf6e5
     22	03:15	   3.815.596	78.215	-1.00	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 g2g3 f7f5 c3c4 Kg7f6 c2c3 Rd8g8 Kc1c2 Bh6xd2 Rd1xd2 Rg8xg3
     23	03:35	   4.437.181	77.502	-1.00	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 g2g3 f7f5 c3c4 Kg7f6 c2c3 Rd8g8 Kc1c2 Bh6xd2 Rd1xd2 Rg8xg3
     24	05:15	   8.241.194	82.280	-1.79	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1d1 Rd8d4
     25	05:50	  11.538.790	83.715	-1.79	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1d1 Rd8d4
     26	06:45	  15.941.839	85.112	-1.79	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2
     27	07:20	  22.777.981	85.526	-1.79	Rd5xd2 Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2
   4/1/2008 7:31:21 PM, Time for this analysis: 00:10:00, Rated time: 10:18

[d]5rk1/pp3p1p/7b/2p5/8/2P4P/P1PR2P1/2K4R b - - bm Rd8; c0 "Julio P Kaplan vs David Bronstein at Hastings, 1975"; id "kbp2";
3) Rd8; c0 "Julio P Kap 
    Searching move: Rf8-d8
    Best move (Rybkav2.3.2a.w32): Rf8-d8
    identical moves! Found in: 00:11
      5	00:06	         768	46.260	+0.31	Rf8d8 Rh1d1
      6	00:11	         918	28.485	+0.20	Rf8d8 Rh1d1 Kg8g7
      7	00:11	       2.455	52.373	+0.27	Rf8d8 Rh1d1 Kg8g7 a2a4
      8	00:16	       3.693	59.088	+0.29	Rf8d8 Rh1d1 Kg8g7 a2a4 c5c4
      9	00:21	       8.115	65.950	+0.45	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 a3a4
     10	00:26	       9.359	67.490	+0.46	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 a3a4 Kg7g6
     11	00:26	      12.070	65.395	+0.48	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3
     12	00:31	      14.438	55.372	+0.46	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 Kf6e5
     13	00:36	      28.311	37.024	+0.64	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 Kf6e5 Kd2e3
     14	00:41	      38.232	39.110	+0.65	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Rd8xd2 Rd1xd2 Kf6e5 a3a4
     15	00:51	      50.346	42.783	+0.65	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4 Kd2d3
     16	00:56	      71.541	44.615	+0.63	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4 Kd2d3
     17	01:25	     111.590	47.159	+0.65	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4 Kd2d3
     18	01:29	     158.514	36.698	+0.65	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4 Kd2d3
     19	01:40	     481.496	45.861	+0.68	Rf8d8 Rh1d1 Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 f5f4 Kd2e2
     20	02:05	   2.440.160	38.701	+1.01	Rf8d8 Rh1d1 Kg8g7 g2g3 f7f5 c3c4 Kg7f6 c2c3 Rd8g8 Kc1c2 Bh6xd2 Rd1xd2 Rg8xg3 Rd2d6+
     21	02:55	   2.606.893	37.301	+1.01	Rf8d8 Rh1d1 Kg8g7 g2g3 f7f5 c3c4 Kg7f6 c2c3 Rd8g8 Kc1c2 Bh6xd2 Rd1xd2 Rg8xg3 Rd2d6+
     22	03:20	   3.228.650	40.142	+1.12	Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2 Rf2xd2
     23	03:50	   3.574.258	41.524	+1.12	Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2 Rf2xd2
     24	04:15	   4.587.241	45.785	+1.38	Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2 Rf2xd2
     25	06:07	   7.246.344	43.821	+1.62	Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2 Rf2xd2
     26	06:32	   9.022.533	35.901	+1.62	Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2 Rf2xd2
     27	07:02	  19.641.331	48.393	+1.96	Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2 Rf2xd2
     28	07:59	  26.832.629	50.715	+1.96	Rf8d8 Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e5 Rf1e1+ Ke5f5 Re1f1+ Kf5g6 Rf1f2 Rd8xd2 Rf2xd2
   4/1/2008 7:41:30 PM, Time for this analysis: 00:10:08, Rated time: 10:29

[d]3r2k1/pp3p1p/7b/2p5/8/2P4P/P1PR2P1/2K4R w - - bm Rd1; c0 "Julio P Kaplan vs David Bronstein at Hastings, 1975"; id "kbp3";
4) Rd1; c0 "Julio P Kap 
    Searching move: Rh1-d1
    Best move (Rybkav2.3.2a.w32): Rh1-d1
    identical moves! Found in: 00:21
      5	00:11	       1.121	71.744	-0.18	Rh1d1 Kg8g7
      6	00:21	       2.122	67.904	-0.40	Rh1d1 Kg8g7 a2a4
      7	00:26	       3.598	78.390	-0.22	Rh1d1 Kg8g7 a2a4 c5c4
      8	00:31	       6.624	39.435	-0.30	Rh1d1 Kg8g7 h3h4 Kg7g6 h4h5+ Kg6f6
      9	00:39	       9.844	49.413	-0.37	Rh1d1 Kg8g7 g2g3 Rd8d6 a2a3 f7f5
     10	00:40	      13.498	51.962	-0.44	Rh1d1 Kg8g7 a2a3 Kg7g6 a3a4 f7f5 g2g3
     11	00:40	      18.098	53.873	-0.52	Rh1d1 Kg8g7 h3h4 Kg7g6 g2g3 f7f5 a2a4 Kg6f6
     12	00:40	      50.601	60.250	-0.71	Rh1d1 Kg8g7 c3c4 Rd8d4 c2c3 Bh6xd2+ Rd1xd2 Rd4xc4 Kc1b2 b7b6 Rd2d7
     13	00:40	      58.767	60.117	-0.71	Rh1d1 Kg8g7 c3c4 Rd8d4 c2c3 Bh6xd2+ Rd1xd2 Rd4xc4 Kc1b2 b7b6 Rd2d7 a7a5
     14	00:40	      77.413	59.647	-0.70	Rh1d1 Kg8g7 c3c4 Rd8d4 c2c3 Bh6xd2+ Rd1xd2 Rd4xc4 Kc1b2 b7b5 Rd2d7 a7a6 Rd7c7
     15	00:40	      96.647	58.629	-0.67	Rh1d1 Kg8g7 c3c4 Rd8d4 c2c3 Bh6xd2+ Rd1xd2 Rd4xc4 Kc1b2 b7b5 Rd2d7 a7a6 Rd7c7 Rc4e4
     16	00:40	     133.158	59.361	-0.61	Rh1d1 Kg8g7 c3c4 Rd8d4 c2c3 Bh6xd2+ Rd1xd2 Rd4xc4 Kc1b2 b7b5 Rd2d7 a7a6 Kb2b3 Rc4e4
     17	00:40	     343.800	63.466	-0.79	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6e7 Rf1e1+ Ke7f8 Re1e2 Rd8d4 c2c3 Bh6xd2+ Kc1c2 Bd2xc3
     18	01:21	     549.765	64.220	-0.93	Rh1d1 Kg8g7 a2a3 Kg7g6 a3a4 Rd8d6 g2g3 f7f5 c3c4 Rd6d4 c2c3 Bh6xd2+ Rd1xd2 Rd4xc4
     19	01:41	     669.744	65.216	-0.94	Rh1d1 Kg8g7 a2a3 Kg7g6 a3a4 Rd8d6 g2g3 f7f5 c3c4 Rd6d4 c2c3 Bh6xd2+ Rd1xd2 Rd4xc4
     20	02:06	   1.067.304	65.186	-1.45	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 Kc1d1 Bh6xd2 Kd1xd2 Kf5e4
     21	02:26	   1.281.378	66.700	-1.45	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 Kc1d1 Bh6xd2 Kd1xd2 Kf5e4
     22	02:46	   1.781.149	71.132	-1.46	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 Kc1d1 Bh6xd2 Kd1xd2 Kf5e4
     23	03:06	   2.943.742	75.862	-1.60	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 Kc1d1 Bh6xd2 Kd1xd2 Kf5e4
     24	03:31	   4.783.590	79.205	-1.62	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 Kc1d1 Bh6xd2 Kd1xd2 Kf5e4
     25	03:51	   9.959.122	49.830	-2.12	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 Kc1d1 Bh6xd2 Kd1xd2 Kf5e4
     26	06:31	  20.773.065	55.228	-2.69	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 Kc1d1 Bh6xd2 Kd1xd2 Kf5e4
     27	09:15	  27.332.534	50.914	-2.69	Rh1d1 Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 Kc1d1 Bh6xd2 Kd1xd2 Kf5e4
   4/1/2008 7:51:35 PM, Time for this analysis: 00:10:04, Rated time: 10:50

[d]3r2k1/pp3p1p/7b/2p5/8/2P4P/P1PR2P1/2KR4 b - - bm c4; c0 "Julio P Kaplan vs David Bronstein at Hastings, 1975"; id "kbp4";
5) c4; c0 "Julio P Kapl 
    Searching move: c5-c4
    Best move (Rybkav2.3.2a.w32): Kg8-g7
    Not found in: 10:00
      5	00:05	       2.271	70.469	+0.38	Kg8g7 g2g3
      6	00:10	       4.506	96.128	+0.30	Kg8g7 g2g3 c5c4
      7	00:10	       6.268	80.230	+0.35	Kg8g7 g2g3 c5c4 g3g4
      8	00:15	       7.122	76.767	+0.32	Kg8g7 g2g3 c5c4 g3g4 Bh6xd2+ Rd1xd2 Rd8xd2 Kc1xd2 Kg7g6
      9	00:20	      11.437	74.123	+0.53	Kg8g7 g2g3 c5c4 a2a3 Rd8d5 h3h4
     10	00:25	      12.650	74.876	+0.48	Kg8g7 g2g3 c5c4 a2a3 Rd8d5 h3h4 f7f5
     11	00:25	      25.480	42.702	+0.48	Kg8g7 a2a3 f7f5 c3c4 Rd8xd2 Rd1xd2 Kg7f6 a3a4 Bh6xd2+ Kc1xd2 Kf6e5
     12	00:30	      32.920	40.614	+0.63	Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Rd8xd2 Rd1xd2 Bh6xd2+ Kc1xd2 Kf6e5 Kd2e3 f5f4+ Ke3d3
     13	00:35	      39.679	37.106	+0.65	Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Rd8xd2 Rd1xd2 Bh6xd2+ Kc1xd2 Kf6e5 Kd2e3 f5f4+ Ke3e2
     14	00:40	      52.058	34.436	+0.63	Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Rd8xd2 Rd1xd2 Bh6xd2+ Kc1xd2 Kf6e5 Kd2e3 f5f4+ Ke3d3
     15	00:40	      74.511	32.112	+0.64	Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Rd8xd2 Rd1xd2 Bh6xd2+ Kc1xd2 Kf6e5 Kd2e3 f5f4+ Ke3f3
     16	01:08	     112.113	35.653	+0.65	Kg8g7 a2a3 f7f5 c3c4 Kg7f6 c2c3 Rd8xd2 Rd1xd2 Bh6xd2+ Kc1xd2 f5f4 Kd2d3 Kf6f5 a3a4
     17	01:08	     542.413	37.415	+0.86	Kg8g7 g2g3 c5c4 a2a3 Rd8d5 a3a4 Rd5a5 Kc1b2 Bh6xd2 Rd1xd2 Ra5xa4 Rd2d7 b7b6 g3g4
     18	01:48	     753.770	40.789	+0.89	Kg8g7 g2g3 c5c4 a2a3 Rd8d5 a3a4 Rd5a5 Kc1b2 Bh6xd2 Rd1xd2 Ra5xa4 Rd2d4 h7h5 Kb2c1
     19	02:23	   1.093.215	39.084	+0.93	Kg8g7 g2g3 c5c4 a2a3 Rd8d5 a3a4 Rd5a5 Kc1b2 Bh6xd2 Rd1xd2 Ra5xa4 h3h4 b7b6 g3g4
     20	03:03	   2.520.006	39.032	+1.38	Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 a2a4 Bh6xd2+ Kc1xd2 Kf5e4 c2c3
     21	03:25	   3.487.605	42.286	+1.81	Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 a2a4 Bh6xd2+ Kc1xd2 Kf5e4 c2c3
     22	05:29	   4.738.740	41.116	+2.00	Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 a2a4 Bh6xd2+ Kc1xd2 Kf5e4 c2c3
     23	05:54	   8.064.792	44.673	+2.40	Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 a2a4 Bh6xd2+ Kc1xd2 Kf5e4 c2c3
     24	08:11	  13.822.774	53.713	+2.58	Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 g2g3 Bh6xd2+ Kc1xd2 Kf5e4 g3g4
     25	08:46	  22.059.783	63.606	+2.59	Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 g2g3 Bh6xd2+ Kc1xd2 Kf5e4 g3g4
     26	09:55	  27.327.056	61.043	+2.59	Kg8g7 c3c4 Kg7f6 Rd1f1+ Kf6g6 Rf1f2 Rd8xd2 Rf2xd2 Kg6f5 g2g3 Bh6xd2+ Kc1xd2 Kf5e4 g3g4
   4/1/2008 8:01:37 PM, Time for this analysis: 00:10:00, Rated time: 20:50

3 of 5 matching moves
4/1/2008 8:01:38 PM, Total time: 12:51:13 AM
Rated time: 20:50 = 1250 Seconds
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