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Subject: Re: The EPD "Comet Pawn Sacrifice" challenge:

Author: Eelco de Groot

Date: 21:33:02 02/12/00

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Hi Dann, I don't believe anybody entered a Rebel version in your challenge, so
here are some results with the good old ECTool engine from Rebel:

In the original position the Rebel engine plays 1... b6 with an evaluation of
.21 at 15 ply. 1... Bg4 does not go higher than .19 after entering 2. Qxb7 Bxf3
3. gxf3. If I just enter the four different first moves the evaluations from
Black's point of view are very close together. Actually for this kind of
analysis I would like to have a less selective engine to avoid the risk of
pruning away important moves. I suppose I'm just hooked on the ease with which I
can enter EPD strings in ECTool...

Hash is set at 13Mb because this is optimal for all Rebel versions older than
Rebel 10c.

In the original position then:
Rebel Engine for ECTool. (c) Ed Schröder

Engine version   :  REBEL 9/10
Hash table size  :  13 Mb
Analysis mode   :  Analyzing next move
Refresh interval : 1000 ms

Game begin

00:01  07.00  0.21  b7-b6 Bc1-e3 Bc8-e6 Qb3-a4 b6-b5 Qa4-c2 Nc7-d5
00:03  08.00  0.21  b7-b6 Bc1-e3 Bc8-e6 Qb3-a4 b6-b5 Qa4-c2 Nc7-d5
00:07  09.00  0.21  b7-b6 Bc1-e3 Bc8-e6 Qb3-a4 b6-b5 Qa4-c2 Nc7-d5
00:47  10.00  0.27  b7-b6 Qb3-a4 b6-b5 Qa4-a3 Bc8-g4 Nc3-e2 Nc7-e6
01:23  11.00  0.21  b7-b6 Bc1-e3 Bc8-g4 Nf3-d2 Nc7-e6 d4-d5 c6xd5
03:30  12.00  0.21  b7-b6 Bc1-e3 Bc8-g4 Nf3-d2 Nc7-e6 d4-d5 c6xd5
07:06  13.00  0.21  b7-b6 Bc1-e3 Bc8-g4 Nf3-d2 Nc7-e6 d4-d5 c6xd5
19:38  14.00  0.20  b7-b6 Bc1-e3 Bc8-e6 Qb3-a4 b6-b5 Qa4-a3 a7-a5
33:14  15.00  0.21  b7-b6 Bc1-e3 Bc8-g4 Nf3-g5 h7-h6 Ng5-e4 Qd8-d7





After 1... Bg4:
Rebel Engine for ECTool. (c) Ed Schröder

Engine version   :  REBEL 9/10
Hash table size  :  13 Mb
Analysis mode   :  Analyzing next move
Refresh interval : 1000 ms

Game begin

00:00  07.00  -0.02  Qb3xb7 Bg4xf3 g2xf3 Nc7-e6 d4-d5 c6xd5 Nc3xd5
00:02  08.00  -0.11  Qb3xb7 Bg4xf3 g2xf3 Qd8-d7 Qb7-b4 Nc7-e6 Rf1-d1
00:05  09.00  -0.11  Qb3xb7 Bg4xf3 g2xf3 Qd8-d7 Qb7-b4 Nc7-e6 Rf1-d1
00:09  10.00  -0.11  Qb3xb7 Bg4xf3 g2xf3 Qd8-d7 Qb7-b4 Nc7-e6 Rf1-d1
00:28  11.00  -0.11  Qb3xb7 Bg4xf3 g2xf3 Qd8-d7 Qb7-b4 Nc7-e6 Rf1-d1
02:14  12.00  0.00  Qb3xb7 Bg4xf3 g2xf3 Nc7-e6 Rf1-d1 Ne6xd4 f3-f4
04:16  13.00  0.00  Qb3xb7 Bg4xf3 g2xf3 Nc7-e6 Rf1-d1 Ne6xd4 f3-f4
09:07  14.00  -0.04  Qb3xb7 Bg4xf3 g2xf3 Nc7-e6 d4-d5 c6xd5 Nc3xd5
28:38  15.00  -0.10  Qb3xb7 Bg4xf3 g2xf3 Qd8-d7 Qb7-b4 f7-f6 Qb4-b3+
08:16  16.00  -0.13  Qb3xb7 Bg4xf3 g2xf3 Qd8-d7 Qb7-b4 f7-f6 e5xf6


Dann's Crafty was:133018260; acs 1001; ce 5; pv Qxb7 Bxf3 gxf3 Ne6 d5 Rb8 Qxa7
cxd5 f4 d4 Rd1 Ra8
Qb7 d3;

After 1... b6:
Rebel Engine for ECTool. (c) Ed Schröder

Engine version   :  REBEL 9/10
Hash table size  :  13 Mb
Analysis mode   :  Analyzing next move
Refresh interval : 1000 ms

Game begin

00:01  07.00  -0.14  Bc1-e3 Bc8-g4 Nf3-g5 Bg4-f5 Ra1-c1 h7-h6 Ng5-f3
00:03  08.00  -0.20  Bc1-e3 Bc8-g4 Nf3-g5 h7-h6 f2-f3 Bg4-f5 Ng5-e4
00:10  08.17  -0.19  Qb3-a4 b6-b5 Qa4-a3 Bc8-g4 Nc3-e2 Nc7-e6 Bc1-g5
00:14  09.00  -0.19  Qb3-a4 b6-b5 Qa4-a3 Bc8-g4 Nc3-e2 Nc7-e6 Bc1-g5
00:24  10.00  -0.25  Qb3-a4 b6-b5 Qa4-c2 Bc8-g4 Bc1-e3 Bg4xf3 g2xf3
00:41  10.01  -0.14  Bc1-e3 Bc8-g4 Nf3-d2 Nc7-e6 d4-d5 c6xd5 Qb3xd5
01:28  11.00  -0.14  Bc1-e3 Bc8-g4 Nf3-d2 Nc7-e6 d4-d5 c6xd5 Qb3xd5
06:45  12.00  -0.12  Bc1-e3 Bc8-e6 Qb3-a4 b6-b5 Qa4-a3 a7-a5 Qa3-c5
11:33  13.00  -0.13  Bc1-e3 Bc8-e6 Qb3-a4 b6-b5 Qa4-c2 Be6-f5 Nc3-e4
30:25  14.00  -0.13  Bc1-e3 Bc8-g4 Nf3-g5 h7-h6 Ng5-e4 Qd8-d7 Ra1-c1
12:38  15.00  -0.11  Bc1-e3 Bc8-e6 Qb3-a4 b6-b5 Qa4-d1 Nc7-d5 Nc3-e4

Dann's Crafty was:119806627; acs 1000; ce -34; pv Be3 Be6 Qc2 Nd5 Qd2 Nxc3 Qxc3
Bd5 Rac1 Rc8 Rfe1
e6 Bg5;

After 1... Qd7:
Rebel Engine for ECTool. (c) Ed Schröder

Engine version   :  REBEL 9/10
Hash table size  :  13 Mb
Analysis mode   :  Analyzing next move
Refresh interval : 1000 ms

Game begin

00:01  07.00  -0.08  Bc1-e3 b7-b6 Rf1-d1 Bc8-b7 Ra1-c1 Ra8-d8
00:06  08.00  -0.09  Bc1-e3 b7-b6 Rf1-d1 Bc8-b7 Ra1-c1 Ra8-d8 Nc3-e4
00:08  08.05  -0.09  Rf1-e1 Rf8-d8 Bc1-e3 Qd7-e6 Be3-g5 Qe6xb3 a2xb3
00:11  08.08  -0.07  Rf1-d1 Rf8-d8 Bc1-f4 Qd7-e6 Qb3-b4 Nc7-a6 Qb4-a3
00:15  09.00  -0.07  Rf1-d1 Rf8-d8 Bc1-f4 Qd7-e6 Qb3-b4 Nc7-a6 Qb4-a3
00:36  10.00  -0.08  Rf1-d1 Rf8-d8 Bc1-g5 Nc7-e6 Ra1-c1 h7-h6 Bg5-e3
02:36  11.00  -0.08  Rf1-d1 b7-b6 Bc1-g5 Bc8-b7 Bg5-h4 Rf8-d8 Qb3-b4
08:26  12.00  -0.13  Rf1-d1 b7-b6 Bc1-g5 Bc8-b7 Bg5-h4 Rf8-e8 Ra1-c1
33:10  13.00  -0.13  Rf1-d1 b7-b6 Bc1-g5 Bc8-b7 Bg5-h4 Rf8-e8 Ra1-c1
02:36  14.00  -0.10  Rf1-d1 b7-b6 Bc1-g5 Bc8-b7 Bg5-h4 Rf8-d8 Ra1-c1
17:22  15.00  -0.11  Rf1-d1 b7-b6 Bc1-g5 Bc8-b7 Bg5-h4 Rf8-d8 Ra1-c1

Dann's Crafty was:116385354; acs 1001; ce -42; pv Bg5 h6 Be3 Rd8 Qd1 Qe8 Qd2 Qf8
Ne4 Bf5 Nc5 Rab8;

After 1... Nd5:
Rebel Engine for ECTool. (c) Ed Schröder

Engine version   :  REBEL 9/10
Hash table size  :  13 Mb
Analysis mode   :  Analyzing next move
Refresh interval : 1000 ms

Game begin

00:00  07.00  -0.05  Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 Bc1-g5 f7-f6 Bg5-d2
00:02  07.05  -0.00  Bc1-e3 b7-b6 Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 Ra1-c1
00:03  07.08  0.01  Rf1-d1 Nd5xc3 b2xc3 b7-b5 Bc1-f4 Bc8-e6 Qb3-c2
00:08  08.00  0.00  Rf1-d1 h7-h6 Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 Bc1-d2
00:16  09.00  0.02  Rf1-d1 h7-h6 Bc1-d2 Nd5-b6 Bd2-e3 Bc8-e6 d4-d5
00:40  10.00  -0.09  Rf1-d1 b7-b6 Bc1-d2 Bc8-g4 Ra1-c1 Bg4xf3 g2xf3
00:59  10.01  -0.07  Bc1-e3 Nd5-b6 Rf1-d1
01:03  10.02  0.02  Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 Bc1-g5 f7-f6 e5xf6
01:59  11.00  -0.11  Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 Bc1-g5 f7-f6 e5xf6
02:38  11.01  -0.09  Bc1-e3 Nd5-b6 Ra1-c1 Bc8-e6 Qb3-c2 Nb6-d5 Nc3xd5
06:03  11.10  -0.05  a2-a4 b7-b6 Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 Bc1-g5
12:56  12.00  -0.09  a2-a4 b7-b6 Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 Bc1-g5
14:34  12.02  0.00  Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 b2-b3 Rf8-e8 Bc1-a3
19:51  13.00  0.00  Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 b2-b3 Rf8-e8 Bc1-a3
29:04  14.00  -0.03  Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 b2-b3 Rf8-e8 Bc1-a3
37:11  15.00  -0.11  Nc3xd5 Qd8xd5 Qb3xd5 c6xd5 b2-b3 Rf8-e8 Bc1-a3
49:40  15.01  -0.10  a2-a4 b7-b6 a4-a5 Bc8-g4 a5xb6 Qd8xb6 Nf3-d2
00:16  15.03  -0.09  Bc1-e3 Nd5-b6 Ra1-c1 Bc8-e6 Qb3-c2 Qd8-c7 Nc3-b5

Dann's Crafty was:135875436; acs 1001; ce -30; pv Nxd5 Qxd5 Qxd5 cxd5 Bd2 Bd7
Bb4 Rfe8 Rfc1 Bc6
Rc2 e6 Rac1 Rac8 h3 h6;



After entering 1... Bg4 2. Qxb7 Bxf3 3. gxf3:

Rebel Engine for ECTool. (c) Ed Schröder

Engine version   :  REBEL 9/10
Hash table size  :  13 Mb
Analysis mode   :  Analyzing next move
Refresh interval : 1000 ms

Last Move : 2.gxf3 (Black to play)

00:00  07.00  0.03  Nc7-e6 d4-d5 Ne6-c5 Qb7xc6 Ra8-c8 Qc6-b5 Bg7xe5
00:02  08.11  0.17  Qd8-d7 Qb7-b4 Nc7-e6 Rf1-d1 Ra8-b8 Qb4-c4 Rf8-d8
00:06  09.00  0.17  Qd8-d7 Qb7-b4 Nc7-e6 Rf1-d1 Ra8-b8 Qb4-c4 Rf8-d8
00:19  10.00  -0.08  Qd8-d7 Qb7-b4 f7-f6 Rf1-d1 f6xe5 d4xe5 Qd7-e6
00:24  10.01  0.05  Nc7-e6 Rf1-d1 Ne6xd4 f3-f4 a7-a5 Bc1-e3 Ra8-b8
00:45  11.00  0.10  Nc7-e6 d4-d5 c6xd5 Nc3xd5 Rf8-e8 Nd5-f4 Bg7xe5
00:49  11.01  0.17  Qd8-d7 Qb7-b4 Nc7-e6 Rf1-d1 Ra8-b8 Qb4-c4 Rf8-d8
02:51  12.00  0.16  Qd8-d7 Qb7-b4 f7-f6 Qb4-b3+ Nc7-d5 Rf1-d1 f6xe5
04:10  13.00  0.16  Qd8-d7 Qb7-b4 f7-f6 Qb4-b3+ Nc7-d5 Rf1-d1 f6xe5
08:53  14.00  0.13  Qd8-d7 Qb7-b4 f7-f6 Qb4-c4+ Qd7-e6 Qc4xe6+ Nc7xe6
31:44  15.00  0.19  Qd8-d7 Qb7-b4 f7-f6 f3-f4 f6xe5 f4xe5 Ra8-b8
22:14  16.00  0.18  Qd8-d7 Qb7-b4 f7-f6 f3-f4 Ra8-b8 Qb4-c5 Qd7-g4+

Eelco



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