Author: Ed Schröder
Date: 03:55:25 01/30/00
Go up one level in this thread
On January 30, 2000 at 06:50:55, David Blackman wrote:
>On January 30, 2000 at 04:07:51, allan johnson wrote:
>
>>On January 30, 2000 at 04:05:13, allan johnson wrote:
>>
>>>How many programmes out there can find the wonderful rook sac in the position
>>>below? Neither Rebel Century nor Fritz 5.32 got close within 10 minutes on
>>>a Celeron 433 128 mb ram.It comes from a game between G Sax and J Kestler
>>>Nice 1974.
>[D] r1b1k3/2q1ppb1/2p2n2/3p1PBB/2nP3P/Pp5N/1P2Q1P1/2KR3R b--
>>> If someone thinks the sac is suss please let me know.
>>>1... Rxa3 2pxa3 Qa5 3Rd3 Qxa3ch 4Kb1 Bxf5. At this point both Rebel and Fritz
>>>were acknowledging white's position is lost.
>
>I wonder if 3 Rh-f1 might last a little longer? I can't see what Rd3 is supposed
>to achieve.
>
>But apart from that it just looks like a typical position designed to make null
>move look bad. Fritz is a famous null-mover. Rebel is claimed not to use
>standard recursive null move, but probably uses some other pruning scheme that
>has the same problem here. Junior is supposed to do no null moves for the first
>few moves. Perhaps it would understand this.
4:24 for Rebel Century 1.2, here is the log
Ed
----------------
Thinking....
+---+---+---+---+---+---+---+---+ RXA3.EPD - Player
8 | *R| | *B| | *K| | | |
+---+---+---+---+---+---+---+---+ 00:00:00 00:00:00
7 | | | *Q| | *p| *p| *B| |
+---+---+---+---+---+---+---+---+
6 | | | *p| | | *N| | | Time infinite
+---+---+---+---+---+---+---+---+ Hash 60 Mb
5 | | | | *p| | p | B | B | Engine Rebel Century
+---+---+---+---+---+---+---+---+ Personality Rebel Century
4 | | | *N| p | | | | p | anti-GM Off
+---+---+---+---+---+---+---+---+ Fast Eval. On
3 | p | *p| | | | | | N | Fast Search On
+---+---+---+---+---+---+---+---+ Style Normal
2 | | p | | | Q | | p | | Strength Strongest
+---+---+---+---+---+---+---+---+ Search Normal Search
1 | | | K | R | | | | R |
+---+---+---+---+---+---+---+---+
a b c d e f g h
r1b1k3/2q1ppb1/2p2n2/3p1PBB/2nP3P/Pp5N/1P2Q1P1/2KR3R b q -
[Event "?"]
[Site " White to move "]
[Date "2000.01.30"]
[Round "?"]
[White "Player"]
[Black "RXA3.EPD"]
[Result "*"]
[WhiteElo "?"]
[BlackElo "?"]
[FEN "r1b1k3/2q1ppb1/2p2n2/3p1PBB/2nP3P/Pp5N/1P2Q1P1/2KR3R b - - 0 1"]
1..*
00:00:00 1.00 -1.27 1..Nxh5 2.Qxh5 Bxf5
00:00:00 2.00 -1.43 1..Nxh5 2.Qxh5 Bxf5 3.Qe2
00:00:00 3.00 -1.49 1..Nxh5 2.Qxh5 Bxf5 3.Rdf1 Bg6 4.Qg4
00:00:00 4.00 -1.47 1..Nxh5 2.Qxh5 Bxf5 3.Rde1 e5 4.dxe5
Bxe5 (0)
00:00:00 5.00 -1.64 1..Nxh5 2.Qxh5 Bxf5 3.Rhe1 Be4 4.Re2
00:00:01 5.01 -1.61 1..Bxf5 2.Bxf6 Bxf6 3.Rdf1 Be4 4.Kd1
Bc2+ 5.Kc1 (0)
00:00:02 6.00 -1.27 1..Bxf5 2.Bf4 e5 3.dxe5 Nxh5 4.Qxh5
Be4 5.Qe2 Bxe5 (1)
00:00:04 7.00 -0.80 1..Bxf5 2.Bf4 Qa7 3.Bf3 Bc2 4.Rde1
Nxb2 5.Qxe7+ Qxe7 6.Rxe7+ Kxe7 7.Kxb2 (2)
00:00:05 7.01 -0.80 1..Nxh5
00:00:06 7.01 -0.04 1..Nxh5 2.Qxh5 Rxa3 3.bxa3 Qa5 4.Rd3
Qxa3+ 5.Kd1 Qa1+ 6.Bc1 Nb2+ 7.Ke2
Nxd3 (5)
00:00:09 8.00 -0.04 1..Nxh5 2.Qxh5 Rxa3 3.bxa3 Qa5 4.Rd3
Qxa3+ 5.Kd1 Qa1+ 6.Bc1 Nb2+ 7.Ke2
Nxd3 (6)
00:00:26 9.00 0.40 1..Nxh5 2.Qxh5 Rxa3 3.bxa3 Qa5 4.Rd3
Qxa3+ 5.Kd1 Qa1+ 6.Ke2 Qxh1 7.Rxb3 (12)
00:01:36 10.00 0.43 1..Nxh5 2.Rhe1 Nf6 3.Bxf6 Bxf6 4.Qg4
Kf8 5.Rd3 Qa5 6.Re2 c5 (39)
00:04:24 10.03 0.43 1..Rxa3
00:08:13 10.03 1.65 1..Rxa3 2.bxa3 Qa5 3.Bxf7+ Kxf7
4.Rd3 Qxa3+ 5.Kb1 Ne4 6.Qh5 Kf8
7.Bxe7+ Qxe7 8.Ng5 Nc3+ (264)
Positions : 167.495.130
Nodes per second : 234.587
Extensions (checks) : 21.593.188 (-12%)
Extensions (captures) : 2.253.981 (1%)
Extensions (king safety) : 1.677.657 (1%)
Extensions (on depth) : 1.442.234 (0%)
Extensions (remaining) : 727.392 (0%)
Extensions (total) : 27.694.452 (16%)
Hash Table : 2.092.048 2.285.887 (99%)
Average depth : 16
Deepest depth : 60
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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