Tough test postion

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

Moderators: hgm, Rebel, chrisw

Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Tough test postion

Post by Dann Corbit »

Terry McCracken wrote:
meschle wrote:[D] 4rk2/1p3r2/3q1nQp/1R1P2p1/P2pp3/3B2PP/1P3P2/2R3K1 w - - 0 1

Rxb7 according to the test suite

Spark & winfinder give correct solution but falling score

Rybka 4 and Stockfish give Be2

Advise please on correct solution please - esp those with monster machines :wink:
The move is good. The problem is the're other moves just as good but less aesthetic.
As "The Sphynx" from "Mystery Men" might say,
"Be2 is number one. All other moves are number two or lower!"

Naum, nearly equally as mysterious agrees:

Code: Select all

    18/62	37:50	5.973.641,801	3.581.296	+0.61	Bd3c4 e4e3 Qg6xh6+ Kf8g8 Qh6xg5+ Rf7g7 Rb5b6 Rg7xg5 Rb6xd6 e3xf2+ Kg1g2 Nf6e4 Rd6e6 Rg5xg3+ Kg2h2 Re8xe6 d5xe6 Kg8f8
    19/62	37:50	8.295.662,782	3.653.793	+0.57	Qg6xh6+ Kf8g8 Bd3b1 e4e3 Bb1g6
    19/62	37:50	8.200.388,198	3.650.556	+0.57	Bd3b1 e4e3 Qg6xh6+ Kf8g8 Bb1g6 d4d3 Bg6xd3 e3xf2+ Kg1g2 Nf6e4 Qh6xd6 Ne4xd6 Rb5c5 Re8e3 Bd3f1 Rf7f3 Kg2h2 g5g4 h3xg4
    19/62	37:50	7.322.302,642	3.631.921	+2.23	Bd3e2 Re8d8 Qg6xh6+ Kf8g8 Qh6g6+ Rf7g7 Qg6f5 d4d3 Be2d1 e4e3 Qf5xd3 Rg7e7 Kg1g2 Rd8f8 Qd3g6+ Re7g7 Qg6h6 Nf6e8 Qh6e6+
Top
Terry McCracken
Posts: 16465
Joined: Wed Aug 01, 2007 4:16 am
Location: Canada

Re: Tough test postion

Post by Terry McCracken »

Dann Corbit wrote:
Terry McCracken wrote:
meschle wrote:[D] 4rk2/1p3r2/3q1nQp/1R1P2p1/P2pp3/3B2PP/1P3P2/2R3K1 w - - 0 1

Rxb7 according to the test suite

Spark & winfinder give correct solution but falling score

Rybka 4 and Stockfish give Be2

Advise please on correct solution please - esp those with monster machines :wink:
The move is good. The problem is the're other moves just as good but less aesthetic.
As "The Sphynx" from "Mystery Men" might say,
"Be2 is number one. All other moves are number two or lower!"

Naum, nearly equally as mysterious agrees:

Code: Select all

    18/62	37:50	5.973.641,801	3.581.296	+0.61	Bd3c4 e4e3 Qg6xh6+ Kf8g8 Qh6xg5+ Rf7g7 Rb5b6 Rg7xg5 Rb6xd6 e3xf2+ Kg1g2 Nf6e4 Rd6e6 Rg5xg3+ Kg2h2 Re8xe6 d5xe6 Kg8f8
    19/62	37:50	8.295.662,782	3.653.793	+0.57	Qg6xh6+ Kf8g8 Bd3b1 e4e3 Bb1g6
    19/62	37:50	8.200.388,198	3.650.556	+0.57	Bd3b1 e4e3 Qg6xh6+ Kf8g8 Bb1g6 d4d3 Bg6xd3 e3xf2+ Kg1g2 Nf6e4 Qh6xd6 Ne4xd6 Rb5c5 Re8e3 Bd3f1 Rf7f3 Kg2h2 g5g4 h3xg4
    19/62	37:50	7.322.302,642	3.631.921	+2.23	Bd3e2 Re8d8 Qg6xh6+ Kf8g8 Qh6g6+ Rf7g7 Qg6f5 d4d3 Be2d1 e4e3 Qf5xd3 Rg7e7 Kg1g2 Rd8f8 Qd3g6+ Re7g7 Qg6h6 Nf6e8 Qh6e6+

Why not test Rxb7 to the end and see if it's really less?

In anycase it's winning.
Terry McCracken
Top
Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Tough test postion

Post by Dann Corbit »

Terry McCracken wrote:
Dann Corbit wrote:
Terry McCracken wrote:
meschle wrote:[D] 4rk2/1p3r2/3q1nQp/1R1P2p1/P2pp3/3B2PP/1P3P2/2R3K1 w - - 0 1

Rxb7 according to the test suite

Spark & winfinder give correct solution but falling score

Rybka 4 and Stockfish give Be2

Advise please on correct solution please - esp those with monster machines :wink:
The move is good. The problem is the're other moves just as good but less aesthetic.
As "The Sphynx" from "Mystery Men" might say,
"Be2 is number one. All other moves are number two or lower!"

Naum, nearly equally as mysterious agrees:

Code: Select all

    18/62	37:50	5.973.641,801	3.581.296	+0.61	Bd3c4 e4e3 Qg6xh6+ Kf8g8 Qh6xg5+ Rf7g7 Rb5b6 Rg7xg5 Rb6xd6 e3xf2+ Kg1g2 Nf6e4 Rd6e6 Rg5xg3+ Kg2h2 Re8xe6 d5xe6 Kg8f8
    19/62	37:50	8.295.662,782	3.653.793	+0.57	Qg6xh6+ Kf8g8 Bd3b1 e4e3 Bb1g6
    19/62	37:50	8.200.388,198	3.650.556	+0.57	Bd3b1 e4e3 Qg6xh6+ Kf8g8 Bb1g6 d4d3 Bg6xd3 e3xf2+ Kg1g2 Nf6e4 Qh6xd6 Ne4xd6 Rb5c5 Re8e3 Bd3f1 Rf7f3 Kg2h2 g5g4 h3xg4
    19/62	37:50	7.322.302,642	3.631.921	+2.23	Bd3e2 Re8d8 Qg6xh6+ Kf8g8 Qh6g6+ Rf7g7 Qg6f5 d4d3 Be2d1 e4e3 Qf5xd3 Rg7e7 Kg1g2 Rd8f8 Qd3g6+ Re7g7 Qg6h6 Nf6e8 Qh6e6+

Why not test Rxb7 to the end and see if it's really less?

In anycase it's winning.
I'm not at all convinced that Rxb7 is winning, but it certainly is worth a go to analyze that alternative. It gets pushed out of my lists of top moves when I analyze on multi-pv, and so I will simply make that key move and analyze the one ply forward position.
Top
Dann Corbit
Posts: 12540
Joined: Wed Mar 08, 2006 8:57 pm
Location: Redmond, WA USA

Re: Tough test postion

Post by Dann Corbit »

Dann Corbit wrote:
Terry McCracken wrote:
Dann Corbit wrote:
Terry McCracken wrote:
meschle wrote:[D] 4rk2/1p3r2/3q1nQp/1R1P2p1/P2pp3/3B2PP/1P3P2/2R3K1 w - - 0 1

Rxb7 according to the test suite

Spark & winfinder give correct solution but falling score

Rybka 4 and Stockfish give Be2

Advise please on correct solution please - esp those with monster machines :wink:
The move is good. The problem is the're other moves just as good but less aesthetic.
As "The Sphynx" from "Mystery Men" might say,
"Be2 is number one. All other moves are number two or lower!"

Naum, nearly equally as mysterious agrees:

Code: Select all

    18/62	37:50	5.973.641,801	3.581.296	+0.61	Bd3c4 e4e3 Qg6xh6+ Kf8g8 Qh6xg5+ Rf7g7 Rb5b6 Rg7xg5 Rb6xd6 e3xf2+ Kg1g2 Nf6e4 Rd6e6 Rg5xg3+ Kg2h2 Re8xe6 d5xe6 Kg8f8
    19/62	37:50	8.295.662,782	3.653.793	+0.57	Qg6xh6+ Kf8g8 Bd3b1 e4e3 Bb1g6
    19/62	37:50	8.200.388,198	3.650.556	+0.57	Bd3b1 e4e3 Qg6xh6+ Kf8g8 Bb1g6 d4d3 Bg6xd3 e3xf2+ Kg1g2 Nf6e4 Qh6xd6 Ne4xd6 Rb5c5 Re8e3 Bd3f1 Rf7f3 Kg2h2 g5g4 h3xg4
    19/62	37:50	7.322.302,642	3.631.921	+2.23	Bd3e2 Re8d8 Qg6xh6+ Kf8g8 Qh6g6+ Rf7g7 Qg6f5 d4d3 Be2d1 e4e3 Qf5xd3 Rg7e7 Kg1g2 Rd8f8 Qd3g6+ Re7g7 Qg6h6 Nf6e8 Qh6e6+

Why not test Rxb7 to the end and see if it's really less?

In anycase it's winning.
I'm not at all convinced that Rxb7 is winning, but it certainly is worth a go to analyze that alternative. It gets pushed out of my lists of top moves when I analyze on multi-pv, and so I will simply make that key move and analyze the one ply forward position.
Initially, looking at the bottom line analysis after both positions (after making the key move) were analyzed in a batch, it seemed cut and dried:

Black is in good shape (down about 1/3 of a pawn and working on a fail high after Rxb7):
[d]4rk2/1R3r2/3q1nQp/3P2p1/P2pp3/3B2PP/1P3P2/2R3K1 b - - acd 30+; acn 7720309589; acs 1828; bm Rxb7; ce -36; pv Rxb7 Rc6 Rg7 Qxh6 Rd8 Be2 d3 Rxd6 Rxd6 Bg4;

Black is in bad shpe (down 3 and 3/4 pawns and working on a fail low after Be2):
[d]4rk2/1p3r2/3q1nQp/1R1P2p1/P2pp3/6PP/1P2BP2/2R3K1 b - - acd 28-; acn 8145411531; acs 2198; bm Rd8; ce -367; pv Rd8 Qxh6+ Kg8 Qg6+ Kf8 Qxg5 Nh7 Qh4 Qf6 Qxf6;

However, looking carefully at the actual log files shows that for the Rxb7 choice, Stockfish has gone into its fabled "sewing machine mode":

Code: Select all

2)                      
    Avoid move: 
    Best move (Stockfish-171-64-ja): Rf7xb7
    Not found in: 38:20
      2	00:00	       4.694	1.173.500	+4.04	Rf7xb7 Bd3b5 Qd6e7
      3	00:00	       5.574	1.114.800	+3.23	Rf7xb7 Qg6xh6+ Kf8f7 Bd3b5 Rb7xb5 a4xb5 Qd6xd5
      4	00:00	       8.025	1.146.428	+2.54	Rf7xb7 Qg6xh6+ Kf8g8 Bd3b5 Re8a8 Qh6xg5+ Rb7g7
      5	00:00	      11.083	1.231.444	+0.04	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Qd6xd5 Qh6xf6+ Kf8g8
      6	00:00	      11.770	61.623	+0.04	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Qd6xd5 Qh6xf6+ Kf8g8
      7	00:00	      26.999	133.000	-0.04	Rf7xb7 Rc1c6 Rb7g7 Qg6f5 Qd6b4 Qf5xf6+ Kf8g8 Bd3b5 Qb4xb2 Qf6xh6
      8-	00:00	      49.896	228.880	-0.12	Rf7xb7 Rc1c6 Rb7g7 Qg6f5 Qd6b4 Qf5xf6+ Kf8g8 Bd3c4 Qb4xb2 Kg1g2
      8-	00:00	      51.115	226.172	-0.20	Rf7xb7 Rc1c6 Rb7g7 Qg6f5 Qd6b4 Rc6xf6+ Kf8g8 Bd3b5
      8-	00:00	      51.972	224.987	-0.36	Rf7xb7 Rc1c6 Rb7g7 Qg6f5 Qd6b4 Rc6xf6+ Kf8g8 Bd3b5
      8	00:00	      53.980	228.728	-0.32	Rf7xb7 Rc1c6 Rb7g7 Qg6f5 Re8e5 Qf5c8+ Re5e8 Rc6xd6 Re8xc8 Rd6xf6+ Rg7f7 Rf6xf7+ Kf8xf7 Bd3xe4 Kf7e7
      9+	00:00	      61.224	247.870	 0.00	Rf7xb7 Rc1c6 Rb7g7 Qg6f5 Re8e5 Qf5c8+ Re5e8 Rc6xd6 Re8xc8 Rd6xf6+ Rg7f7 Rf6xf7+ Kf8xf7 Bd3xe4 Rc8b8
      9	00:00	      63.639	252.535	 0.00	Rf7xb7 Rc1c6 Rb7g7 Qg6f5 Re8e5 Qf5c8+ Re5e8 Qc8f5
     10	00:00	      95.042	346.868	-0.40	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Qd6xd5 Qh6xf6+ Qd5f7 Qf6d6+ Qf7e7 Bd3b5 Re8d8 Qd6h6 Qe7f7 Rc6e6
     11	00:00	     213.707	672.034	-0.32	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 e4xd3 Rc6xd6 d3d2 Qh6xf6+ Kf8g8 Qf6xd4 Re8e1+ Kg1g2 d2d1Q Qd4xd1 Re1xd1 b2b4 Kg8f7 Kg2f3 Kf7e7 Rd6e6+ Ke7d7 Kf3e4 Rd1e1+ Ke4f5 Rg7f7+ Re6f6 Rf7xf6+ Kf5xf6
     12-	00:00	     395.553	556.333	-0.60	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 e4xd3 Rc6xd6 d3d2 Qh6xf6+ Kf8g8 Qf6f3 Re8e1+ Kg1g2 d2d1Q Rd6d8+ Kg8h7 Qf3f5+ Rg7g6 Rd8d7+ Kh7h6 Qf5f8+ Kh6h5 Rd7h7+
     12-	00:00	     421.190	576.183	-0.88	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 e4xd3 Rc6xd6 d3d2 Qh6xf6+ Kf8g8 Qf6f3 Re8e1+ Kg1g2 d2d1Q Rd6d8+ Kg8h7 Qf3f5+ Rg7g6 Rd8d7+ Kh7h6 Qf5f8+ Kh6h5 Rd7h7+
     12	00:00	     475.442	626.405	-1.41	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Qd6xd5 Qh6xf6+ Qd5f7 Qf6d6+ Qf7e7 Bd3b5 e4e3 Qd6xd4 e3e2 Rc6f6+ Kf8g8 Bb5c4+ Kg8h7 Bc4d3+ Kh7g8 Qd4c4+ Rg7f7 Rf6g6+ Kg8f8
     13	00:01	   2.579.336	2.004.146	-1.77	Rf7xb7 Rc1c6 Qd6xd5 Rc6xf6+ Rb7f7 Bd3xe4 Rf7xf6 Qg6xf6+ Qd5f7 Qf6xd4 Qf7e6 f2f3 Kf8e7 Kg1g2 Re8d8 Qd4f2 Qe6a2 Qf2c2 Rd8d6 Qc2c7+ Ke7e6 Be4f5+ Ke6e5 Qc7e7+ Ke5d5
     14	00:01	   3.249.794	2.233.535	-1.77	Rf7xb7 Rc1c6 Qd6xd5 Rc6xf6+ Rb7f7 Bd3xe4 Rf7xf6 Qg6xf6+ Qd5f7 Qf6xd4 Qf7e6 f2f3 Kf8e7 Kg1g2 Re8d8 Qd4f2 Qe6a2 Qf2c2 Rd8d6 Qc2c7+ Ke7e6 Be4f5+ Ke6e5 Qc7e7+ Ke5d5
     15-	00:01	   4.777.244	2.623.417	-1.97	Rf7xb7 Rc1c6 Qd6xd5 Qg6xh6+ Kf8e7 Qh6xf6+ Ke7d7 Bd3b5 Rb7xb5 a4xb5 Qd5e5 Qf6f7+ Re8e7 Qf7f8 Re7e8 Qf8a3 Re8c8 Qa3a7+ Kd7d8 Rc6xc8+ Kd8xc8 b5b6 Kc8d8 b6b7
     15-	00:02	   4.978.368	2.152.342	-2.18	Rf7xb7 Rc1c6 Qd6xd5 Qg6xh6+ Kf8e7 Qh6xf6+ Ke7d7 Bd3b5 Rb7xb5 a4xb5 Qd5e5 Qf6f7+ Re8e7 Qf7f8 Re7e8 Qf8a3 Re8c8 Qa3a7+ Kd7d8 Rc6xc8+ Kd8xc8 b5b6 Kc8d8 b6b7
     15	00:02	   5.202.438	2.172.207	-2.42	Rf7xb7 Rc1c6 Qd6xd5 Qg6xh6+ Kf8e7 Qh6xf6+ Ke7d7 Bd3b5 Rb7xb5 a4xb5 e4e3 Rc6a6 e3xf2+ Qf6xf2 Re8c8 Ra6a7+ Rc8c7 b5b6 Rc7xa7 b6xa7 d4d3 Qf2d2 Kd7d6 Kg1f2 Qd5d4+ Kf2f3 Qd4xa7 Qd2xd3+ Kd6e5
     16	00:02	   6.531.401	2.404.786	-2.18	Rf7xb7 Rc1c6 Qd6xd5 Qg6xh6+ Kf8e7 Qh6xf6+ Ke7d7 Bd3b5 Rb7xb5 a4xb5 e4e3 Rc6a6 e3xf2+ Qf6xf2 Re8c8 Ra6a7+ Rc8c7 b5b6 Rc7xa7 b6xa7 d4d3 Qf2d2 Kd7c7 h3h4 Kc7b7 h4xg5 Kb7xa7 Kg1f2 Ka7b6
     17	00:04	  14.545.828	2.973.390	-2.54	Rf7xb7 Rc1c6 Qd6xd5 Qg6xh6+ Kf8e7 Qh6xf6+ Ke7d7 Bd3b5 Rb7xb5 a4xb5 e4e3 Rc6a6 e3xf2+ Kg1xf2 Qd5c5 Ra6c6 Qc5e5 Qf6xe5 Re8xe5 Rc6c4 d4d3 b2b4 Re5xb5 Rc4d4+ Kd7e6 Kf2e3 Rb5b8 Ke3xd3 Rb8h8 h3h4 g5xh4 g3xh4 Ke6e5 Rd4e4+ Ke5d5
     18	00:09	  32.419.299	3.276.000	-2.46	Rf7xb7 Rc1c6 Rb7b6 Rc6xd6 Rb6xd6 Bd3c4 Kf8e7 Kg1f1 d4d3 Qg6g7+ Ke7d8 Qg7xh6 Re8g8 Kf1e1 Kd8e7 h3h4 g5xh4 Qh6xh4 Rg8g4 Qh4h3 Rg4g7 Qh3f5 Rg7h7 Qf5e5+ Ke7d7
     19-	00:11	  34.789.042	3.140.939	-2.74	Rf7xb7 Rc1c6 Rb7d7 Rc6xd6 Rd7xd6 Bd3c4 Kf8e7 Kg1f1 d4d3 Qg6g7+ Ke7d8 Qg7xh6 Re8g8 Kf1e1 Kd8e7 h3h4 g5xh4 Qh6xh4 Rg8g4 Qh4h3 Rg4g7 Qh3f5 Rg7h7 Qf5e5+ Ke7d7 Bc4b5+
     19-	00:11	  37.419.253	3.159.075	-3.03	Rf7xb7 Rc1c6 Rb7b6 Rc6xd6 Rb6xd6 Bd3c4 e4e3 Qg6xh6+ Kf8f7 f2xe3 d4xe3 Kg1f1 Nf6e4 Qh6h5+ Kf7e7 Kf1e1
     19	00:14	  47.076.320	3.193.996	-2.54	Rf7xb7 Rc1c6 Rb7b6 Rc6xd6 Rb6xd6 Bd3c4 Kf8e7 Kg1f1 d4d3 Qg6g7+ Ke7d8 Qg7xh6 d3d2 Kf1e2 e4e3 f2xe3 Re8xe3+ Ke2xd2 Nf6e4+ Kd2xe3 Rd6xh6 Ke3xe4 Rh6xh3 g3g4 Kd8e7 Ke4f5 Ke7d6 a4a5 Rh3h7 Kf5xg5 Rh7c7 b2b3 Kd6e5 Kg5g6 Ke5d6
     20+	00:17	  54.155.360	3.109.339	-2.42	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 d3d2 b2b3 Kf8f7
     20+	00:17	  55.895.763	3.135.983	-2.30	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 d3d2 Kg1g2 Kf8f7
     20+	00:18	  57.433.199	3.153.590	-2.06	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Qh6h8+ Rg7g8
     20	00:19	  60.517.683	3.169.792	-2.14	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 d3d2 Kg1f1 e4e3 f2xe3 Rd6xd5 Bg4d1 Kf8f7 e3e4 Nf6xe4 Qh6c6 Rd5e5 Kf1e2 Ne4xg3+ Ke2xd2 Ng3e4+ Kd2e3 Rg7h7 Bd1b3+ Kf7f8 Qc6c8+ Re5e8 Qc8f5+ Kf8g7
     21	00:22	  69.738.622	3.139.540	-1.93	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 d3d2 Kg1f1 e4e3 f2xe3 Rd6xd5 Bg4d1 Kf8f7 e3e4 Nf6xe4 Qh6c6 Rd5e5 b2b4 Ne4xg3+ Kf1f2 Ng3e4+ Kf2e2 Kf7f8 Qc6h6 Re5d5 Ke2e3 Ne4g3 Qh6a6 Rg7d7 Ke3f2 Rd5d3 Qa6h6+ Rd7g7
     22	00:28	  95.336.256	3.305.924	-2.14	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 d3d2 Kg1f1 e4e3 f2xe3 Rd6xd5 Bg4d1 Kf8f7 e3e4 Nf6xe4 Qh6c6 Rd5e5 b2b4 Ne4xg3+ Kf1g2 Ng3f5 Qc6d7+ Kf7f6 Qd7xd2 Nf5e3+ Kg2f2 Ne3xd1+ Qd2xd1 Rg7f7 a4a5 Kf6e7+ Kf2g3 Re5e3+ Kg3g2 Rf7h7 Qd1g4
     23+	00:45	 154.123.175	3.398.976	-1.81	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6 Qh6xg7 d3d2
     23+	00:49	 167.312.514	3.409.044	-1.49	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Qh6xf6+ Qd6xf6 Rc6xf6+ Rg7f7 Rf6xf7+ Kf8xf7 Bd3xe4 Kf7f6 b2b4 Rd8b8 b4b5 Rb8a8 Kg1g2 Kf6e5
     23	00:54	 185.577.319	3.393.320	-1.45	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Kg1f1 Rd6xd5 Bg4h5+ Nf6xh5 Qh6xh5+ Kf7e7 Kf1e1 Rg7f7 Qh5g6 Rd5f5 Qg6c6 Rf7f6 Qc6c4 Ke7f8 Qc4xe4 Rf5xf2 Qe4a8+ Kf8e7 Qa8a7+ Ke7d6 Qa7xf2 Rf6xf2 Ke1xf2 Kd6e7 Kf2e1
     24+	04:11	1.004.590.685	3.997.448	-0.64	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Kg1f1 Rd6xd5 Bg4h5+ Nf6xh5 Qh6xh5+ Kf7e7 Kf1e1
     24	04:14	1.014.136.284	3.986.933	-0.84	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Kg1f1 Rd6xd5 Bg4h5+ Nf6xh5 Qh6xh5+ Kf7e7 Kf1e1 Rg7f7 Qh5g6 Rf7f5 Qg6a6 Rd5c5 Ke1d1 Rc5c2 Qa6b7+ Ke7f6 Qb7xe4 Rf5xf2 Qe4xd3 Rc2xb2 a4a5 Kf6e5 a5a6 Rb2a2 Qd3e3+ Ke5f6 Kd1e1 Rf2b2 Qe3d4+ Kf6e6
     25-	04:23	1.049.667.132	3.982.196	-1.81	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6
     25	04:30	1.075.721.120	3.971.810	-2.06	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6 Kg1f1 Ke6f7 a4a5 Rg7g6 Qh6h8 Rg6g8 Qh8xg8+ Kf7xg8 Kf1e1 Nf6d5 a5a6 Nd5b6 a6a7 Kg8f7 Ke1d2 Kf7e6 h3h4 g5xh4 g3xh4 Nb6c4+ Kd2c3 d3d2 Kc3c2 Nc4b6 Kc2xd2 Ke6d5 h4h5 Nb6a8
     26	04:58	1.194.705.607	4.001.626	-1.53	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6 Kg1f1 Ke6f7 a4a5 Rg7g6 Qh6h8 Rg6g8 Qh8xg8+ Kf7xg8 Kf1e1 Nf6d5 a5a6 Nd5b6 a6a7 Kg8f7 Ke1d2 Kf7e6 h3h4 g5xh4 g3xh4 Ke6f5 h4h5 Kf5g5 b2b4 Kg5xh5 f2f3 e4xf3 Kd2xd3 Kh5g4 Kd3e3
     27	06:27	1.563.050.897	4.036.419	-1.13	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6 Kg1f1 Ke6f7 a4a5 Rg7g6 Qh6h8 Rg6g8 Qh8xg8+ Kf7xg8 Kf1e1 Nf6d5 a5a6 Nd5b6 a6a7 Kg8f7 Ke1d2 Kf7e6 h3h4 g5xh4 g3xh4 Ke6f5 h4h5 Kf5g5 h5h6 Kg5xh6 f2f3 e4xf3 Kd2xd3 Kh6h5 Kd3e3 Kh5g4 b2b4 Kg4g3
     28-	06:47	1.636.880.518	4.020.150	-1.81	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6 Kg1f1 Ke6f7 a4a5 Rg7g6 Qh6h8 Rg6g8 Qh8xg8+ Kf7xg8 Kf1e1 Nf6d5 a5a6 Nd5b6 a6a7 Kg8f7 Ke1d2 Kf7e6 b2b3 Ke6f5 b3b4 Kf5e6 h3h4 g5xh4 g3xh4 Ke6e5 h4h5 Ke5d5 h5h6 Nb6c4+ Kd2c3
     28	07:35	1.838.655.242	4.032.527	-1.33	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6 Kg1f1 Ke6f7 a4a5 Rg7g6 Qh6h8 Rg6g8 Qh8xg8+ Kf7xg8 Kf1e1 Nf6d5 a5a6 Nd5b6 a6a7 Kg8f7 Ke1d2 Kf7e6 b2b3 Ke6f5 b3b4 Kf5e6 h3h4 g5xh4 g3xh4 Ke6e5 h4h5 Ke5d5
     29-	07:58	1.927.882.532	4.029.745	-1.73	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6
     29	09:24	2.297.656,726	4.072.794	-1.49	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6 Kg1f1 Ke6f7 a4a5 Rg7g6 Qh6xg6+ Kf7xg6 a5a6 Nf6d5 a6a7 Nd5b6 Kf1e1 Kg6f5 Ke1d2 Nb6c4+ Kd2c3 Nc4b6 b2b4 Nb6a8 b4b5 Na8c7 Kc3d2 Nc7a8 h3h4 Kf5g4 Kd2e3 g5xh4 g3xh4 Kg4xh4 f2f3 d3d2 Ke3xd2 e4xf3
     30-	10:01	2.447.776,676	4.072.091	-1.77	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+ Kf7xe6 Kg1f1
     30+	13:12	3.284.532,332	4.143.088	-1.21	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Rc6xd6 Rd8xd6 Bd3e2 d4d3 Be2g4 Kf8f7 Bg4e6+ Rd6xe6 d5xe6+
     30+	16:02	3.983.107,427	4.136.970	-0.92	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Qh6xf6+ Qd6xf6 Rc6xf6+ Rg7f7 Rf6xf7+ Kf8xf7 Bd3xe4 Kf7f6
     30-	19:27	4.871.894,484	4.173.697	-2.06	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Bd3e2
     30+	30:28	7.720.309,589	4.222.057	-0.36	Rf7xb7 Rc1c6 Rb7g7 Qg6xh6 Re8d8 Bd3e2 d4d3 Rc6xd6 Rd8xd6 Be2g4
   6/1/2010 11:31:35 PM, Time for this analysis: 00:38:20, Rated time: 1:16:40
So I don't think we can conclude anything about the Rxb7 choice from this analysis. I'll have to choose some other engine to test it, but right now I've other fish to fry. So it looks like I am conceding the point.
Top
yanquis1972
Posts: 1766
Joined: Wed Jun 03, 2009 12:14 am

Re: Tough test postion

Post by yanquis1972 »

very deep IA analysis of Rxb7 was that it drew. unfortunately i don't have the data.
Top
User avatar
meschle
Posts: 200
Joined: Tue Apr 01, 2008 11:53 pm

Re: Tough test postion

Post by meschle »

Thanks Dann, Jon, John and terry - looks like Be2 is the best move but Rxb7 is the more exciting move :D
Regards Mark

Quad Q6600 3.0 Ghz, Vista 64bit, 4gb Ram
Top

Return to “Computer Chess Club: General Topics”