Is there a convincing solution for Arasan 6.16?

[Dann Corbit]

[d]2r1k2r/2q1bp2/b3p2p/3nN1p1/pP1R4/4BN1Q/1PPR1PPP/2K5 w - - bm Nxf7; id "arasan6.16";

Code: Select all

15) Nxf7; id "arasan6.1 
    Searching move: Ne5xf7
    Best move (Rybka v1.2.w32): Rd4xd5
    Not found in: 2:30:00
      2	00:00	         424	27.136	+0.80	Kc1b1
      3	00:00	         760	48.640	+0.71	Kc1b1
      4	00:00	       1.464	31.232	+0.75	Kc1b1 Be7xb4
      5	00:01	       3.024	24.576	+0.46	Kc1b1 Be7xb4 Rd4xd5
      5	00:01	       4.000	26.089	+0.93	Rd4xd5 e6xd5 Qh3f5 Be7xb4
      6	00:01	       6.400	29.925	+0.93	Rd4xd5 e6xd5 Qh3f5 Be7xb4 Rd2xd5
      7	00:01	      13.152	35.818	+1.01	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Rc8d8
      8	00:01	      24.376	42.021	+1.05	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Rc8d8 Rd5xd8+ Be7xd8 Be3c5
      9	00:01	      43.512	48.273	+1.05	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Rc8d8 Rd5xd8+ Be7xd8 Be3c5 Bd8e7
     10	00:02	      90.192	53.231	+1.02	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Qc7b7 Rd5d4 Rc8d8 Rd4xd8+ Be7xd8 Qf5h3
     11	00:04	     184.032	54.813	+1.05	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Qc7b7 Rd5d4 Rc8d8 Rd4xd8+ Be7xd8 Qf5h3 Ba6e2
     12	00:07	     383.552	58.999	+1.17	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Rc8d8 Rd5xd8+ Be7xd8 Qf5e4 Bd8e7 Ne5c6 Ba6b7 Qe4xe7+ Qc7xe7
     13	00:12	     698.864	60.657	+1.15	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Rc8d8 Rd5xd8+ Be7xd8 Qf5e4 Bd8e7 Ne5c6 Ba6b7 Qe4xe7+ Qc7xe7
     14	00:25	   1.479.400	60.783	+1.16	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Qc7b7 Rd5d4 Ba6e2 Ne5d7 Rc8c7 Nf3e5 Qb7xg2 Kc1b1
     15	00:52	   3.035.936	60.621	+0.96	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Qc7b7 Rd5a5 Rc8d8 c2c3 Rd8d5 Ra5xd5 Qb7xd5 Be3c5 Be7xc5
     16	01:45	   6.188.832	60.436	+1.02	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Qc7b7 Rd5a5 Rc8d8 c2c3 Rd8d5 Ra5xd5 Qb7xd5 Be3c5 Qd5b7
     17	03:20	  12.135.312	62.166	+1.08	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Qc7b7 Rd5a5 Rc8d8 c2c3 Ba6e2 Be3d4 Be2xf3 Ne5xf3 Be7d6
     18	06:31	  24.068.192	63.032	+1.09	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Qc7b7 Rd5a5 Rc8d8 c2c3 Ba6e2 Be3d4 Be2xf3 Ne5xf3 Be7d6
     19	13:25	  49.511.912	63.031	+1.08	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Qc7b7 Rd5a5 Rc8d8 c2c3 Rd8d5 Ra5xd5 Qb7xd5 c3c4 Qd5e6
     20	1:14:00	 299.553.264	69.096	+1.35	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Rc8d8 Rd5xd8+ Be7xd8 Qf5e4 Bd8e7 Ne5c6 Ba6b7 Qe4xe7+ Qc7xe7
     21	1:36:20	 384.005.608	68.030	+1.36	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Rc8d8 Rd5xd8+ Be7xd8 Qf5e4 Bd8e7 Ne5c6 Ba6b7 Qe4xe7+ Qc7xe7
     22	2:23:35	 566.785.736	67.373	+1.38	Rd4xd5 e6xd5 Qh3f5 Rh8f8 Rd2xd5 Rc8d8 Rd5xd8+ Be7xd8 Qf5e4 Bd8e7 Ne5c6 Ba6b7 Qe4xe7+ Qc7xe7
   11/23/2007 7:53:09 AM, Time for this analysis: 02:30:01, Rated time: 18:21:09

[pedrox]

Code: Select all

FEN: 2r1k2r/2q1bN2/b3p2p/3n2p1/pP1R4/4BN1Q/1PPR1PPP/2K5 b - - 0 1 

DanaSah v.3.41 FRC:
   2	00:00	       1.829	182.900	+1,85	Dg4 Tf8
   3	00:00	       6.112	611.200	+1,08	Dg4 Tb8 Te4 Cxb4
   4	00:00	      10.226	1.022.600	+1,08	Dg4 Tb8 Te4 Cxb4
   5	00:00	      23.190	579.750	+1,16	Dg4 Tb8 Te4 Cxb4 c4
   6	00:00	     105.940	623.176	+0,44	Dg4 h5 Dh3 Axb4 c3 a3
   6	00:00	     227.402	710.631	+1,43	Rb1 Axb4 c3 Axc3 Txd5 exd5 bxc3 Dxc3 Axg5
   7	00:00	     324.982	722.182	+0,15	Rb1 Axb4 Axg5 Axd2 Txd2 Af1 Ah4 Ac4
   7	00:00	     405.112	723.414	+0,75	Cxf7 Rxf7 Te4 Axb4 Dxe6+ Rg7 Dxd5 Axd2+ Dxd2
   8	00:00	     894.595	745.495	+0,81	Cxf7 Rxf7 Te4 Cxb4 Dxe6+ Rf8 Df5+ Re8 Dg6+ Rf8 Rb1
   9	00:01	   1.296.540	790.573	+0,25	Cxf7 Rxf7 Te4 Cxb4 Dxe6+ Rf8 Df5+ Re8 Dg6+ Rf8 c3 Ad3
   9	00:03	   2.707.274	760.470	+0,46	Dh5 Th7 Cg4 a3 bxa3 Dc3 Rb1 Cxe3 fxe3 Dxa3 Cxh6 Axb4 Cxg5 Axd2 Cxh7
  10	00:05	   4.515.412	788.030	+0,49	Txd5 exd5 Ac5 Ab7 Axe7 Dxe7 Rb1 De6 Dh5 De7 b5
  10	00:07	   5.874.030	812.452	+0,98	Cxf7 Rxf7 Te4 Rg7 Dxe6 Ab7 Ad4+ Af6 Axf6+ Cxf6 De7+ Rg8 Dxc7 Txc7
  11	00:15	  12.066.635	779.498	+1,83	Cxf7 Rxf7 Te4 Rg7 Cd4 Db7 Dxe6 Thf8 Cf5+ Txf5 Ad4+ Tf6 Axf6+ Axf6 Txd5
  12	00:18	  14.997.127	790.154	+1,83	Cxf7 Rxf7 Te4 Rg7 Cd4 Db7 Dxe6 Thf8 Cf5+ Txf5 Ad4+ Tf6 Axf6+ Axf6 Txd5
  13	01:31	  70.141.477	770.785	+2,16	Cxf7 Rxf7 Te4 Ab7 Dh5+ Rg7 Cd4 Cxe3 Cxe6+ Rf6 Df3+ Cf5 Cxc7 Txc7 Tde2 Axe4 Txe4 Td8
  14	03:14	 154.028.645	793.962	+2,69	Cxf7 Rxf7 Te4 Ab7 Dh5+ Rg7 Cd4 Cxe3 Cxe6+ Rf6 Df3+ Cf5 Cxc7 Txc7 Tde2 Axe4 Dxe4 Rg6 Rb1
  15	04:09	 200.627.260	805.731	+2,55	Cxf7 Rxf7 Te4 Ab7 Dh5+ Rg7 Cd4 Cxe3 Cxe6+ Rf6 Df3+ Cf5 Cxc7 Txc7 Tde2 Axe4 Dxe4 Rg6 De6+ Af6 Te5
  16	05:47	 280.397.291	808.061	+2,44	Cxf7 Rxf7 Te4 Rg7 Cd4 Db7 Dxe6 Thf8 Dxd5 Dxd5 Ce6+ Dxe6 Txe6 Axb4 Td7+ Tf7 Ad4+ Rf8 Txf7+ Rxf7 Txa6
  17	07:54	 388.808.612	820.271	+2,49	Cxf7 Rxf7 Te4 Rg7 Cd4 Db7 Dxe6 Thf8 Dxd5 Dxd5 Ce6+ Dxe6 Txe6 Tf7 Ad4+ Rh7 Txa6 Axb4 Td3
  18	16:10	 797.130.794	821.784	+2,55	Cxf7 Rxf7 Te4 Rg7 Dxe6 Ab7 Ad4+ Af6 Axf6+ Cxf6 De7+ Rg8 Dxf6 Axe4 De6+ Rf8 Dxe4 Df7 Rb1 Dh7 Dxh7 Txh7 b5

Nxf7 --> +2,55
Rxd5 --> +1,50

[jdart]

Arasan may be over-optimistic here but it gives Nxf7 a substantially better score than alternatives at 1hr/move:

"arasan6.16" bm Nxf7
result: Nxf7 3600 seconds. score: +3.09 2522205566 nodes. ++ corre
ct
Nxf7 Kxf7 Re4 Bf6 Qxe6+ Kg7 Qxa6 a3 Qxa3 Ra8 Rxd5 Rxa3 bxa3 Qc6 c4 Qa4 Rd3
result(2): Rxd5 3600 seconds. score: +2.28 2472070693 nodes.
** error
Rxd5 exd5 Qf5 Bxb4 Rxd5 a3 Rd7 axb2+ Kxb2 Ba3+ Kxa3 Qc3+ Ka2 Rf8 Qe4 f5 Qd4 Qxc2
+ Ka1 Bb5 Ra7 Qc3+ Qxc3
result(3): Qh5 3600 seconds. score: +0.78 2182507796 nodes.
** error
Qh5 Rh7 Nxf7 Rxf7 Qxh6 a3 Qxe6 Nxe3 Qxe3 a2 Qa3 Bc4 h4 Rxf3 gxf3 Bxb4