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Subject: Re: Extensions?!

Author: Peter W. Gillgasch

Date: 20:26:43 01/13/98

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Hi folks,

I have prepared this post offline with BBEdit Lite and
will paste the output of Chess Demon for the PowerMacintosh
(the output is from the ANSI C dev version without any
assembly parts, the version with the Mac GUI and all the goodies
like database stuff is in the works and I am mainly posting
this since I am  bored by the MacsBug screen ;). After that
is done I'll probably do an assembly version of the kernel 8^)

I hope this comes across even with this darned Netscape 2
thing. If anyone has a browser ON THE MAC to recommend to
actually participate in the discussion, please drop me a
note. Can the owners of this site make it somehow possible
to post via email ? I really hate this Web setup !

The machine I am running on is a 4 year old PowerMacintosh
6100/60 (PowerPC 601 @60 mhz, one IU) with 72 mb RAM. Speed
scales with clock of course and there are 350 mhz Macs with
three IUs out there, so we are off by a factor of roughly
15 ;)

The times are printed after the PV is established, if
it prints a time Chess Demon has searched the 1st move
to the nominal depth + selective extensions + captures.

I apologize for the lack of technical content. In any case,
the full set of extensions I usually use was in place, so
I don't doubt that Bob can hit 8 in 2 seconds. I have also
attached the result from the brute force version + check
extensions for the sake of making comparision of tree sizes
etc easier, although the program was certainly not designed
for that settings.

-- Peter

>time fixed 00:01:00

0 sec
>xref 18
39505116 KB allocated.

0 sec
>open wac3.ci
 position 003

8 :::   :::   :::*R *K:
7    *P:*P *B:   :::   *P:
6 *P:   *P:*B :::   :::
5    :::   :::   :::*Q :::
4 :::   ::: P :::*P :::*R
3    ::: P ::: R :::   :P:
2 :P: P ::: B :Q:   :P:
1    :::   :::   :R: K :N:
   A  B  C  D  E  F  G  H

   Oh yeah and I should fix the board output routine for
   the lite/dark squares anytime soon ;)

Minimum T: 00:01:00
Target  T: 00:01:00
Maximum T: 00:01:00
Legal moves: 40
00:00:00  1/  1 Rf1xf4 -567 (-4.429688)
00:00:00  1/  3 Re3-d3 30 (0.234375)
00:00:00  1/  4 Re3-f3 57 (0.445313)
00:00:00  1/  5 Re3-g3 Bd2xg5 Qe2xf1 111 (0.867188)
00:00:00  2/  1 Re3-g3 Qg5xg3 -680 (-5.312500)
00:00:00  2/  2 Re3-f3 Bd7xh3 -105 (-0.820313)
00:00:00  2/  5 Qe2-c4 Rf8-f7 25 (0.195313)
00:00:00  3/  1 Qe2-c4 Kg8-h8 Re3-g3 Qg5-f5 70 (0.546875)
>> 136
00:00:00  3/ 12 Re3-g3  f4-f3 Bd2xg5 136 (1.062500)
>> 168
00:00:00  4/  1 Re3-g3    O-O 111 (0.867188)
>> 160
00:00:00  5/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Bd6xf8 223 (1.742188)
00:00:00  6/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Bd2-g5 Rf8xf1 Qe2xf1 227
(1.773438)
>> 275
00:00:01  7/  1 Re3-g3 Qg5xg3 Bd2xf4    O-O 272 (2.125000)
>> 304
00:00:03  8/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Rf1xf8 Bd6xf8 Bd2-g5 Rh4-h6
Bg5xh6 483 (3.773438)
00:00:05  9/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Rf1xf8 Bd6xf8 Bd2-g5 Rh4-h6
Bg5xh6 483 (3.773438)
>> 515
00:00:12 10/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Rf1xf8 Kg8xf8 Qe2-f3 Kf8-g7
Bd2-g5 Rh4-h6 Bg5xh6 Kg7xh6 534 (4.171875)
00:00:51 11/  1 Re3-g3  h7-h6 Rg3xg5  h6xg5 Nh1-f2  b7-b5 Nf2-d3 Rh4-h7
Nd3-e5 Bd7-e6 Ne5xc6 Be6xa2 549 (4.289063)

Stopped at 12/1.

  1. Re3-g3

My move is Rg3. Boy, you are in trouble.

00:01:00 6122978 nodes NPS: 101710.598007

There is obviously a problem with hash table saturation.

Now here is the output of the plain vanilla brute force version, with
only
check extensions in place:

00:00:00  1/  3 Re3-d3 2 (0.015625)
00:00:00  2/  1 Re3-d3 Bd7xh3 -126 (-0.984375)
00:00:00  2/  3 Re3-g3 Qg5xg3 Nh1xg3 130 (1.015625)
One move is superior!
00:00:00  3/  1 Re3-g3 Qg5xg3 Bd6xf8 130 (1.015625)
00:00:00  4/  1 Re3-g3 Qg5xg3 Nh1xg3 Bd6xf8 130 (1.015625)
00:00:00  5/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Qe2-c4 Kg8-h8 Bd6xf8 146
(1.140625)
00:00:00  6/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Qe2-c4 Kg8-h8 Bd6xf8 146
(1.140625)
>> 194
00:00:03  7/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Rf1xf8 Bd6xf8 Bd2-g5 Rh4-h6
Bg5xh6 354 (2.765625)
00:00:13  8/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Rf1xf8 Bd6xf8 Bd2-g5 Rh4-h6
354 (2.765625)
00:00:54  9/  1 Re3-g3 Qg5xg3 Nh1xg3  f4xg3 Rf1xf8 Bd6xf8 Qe2-e3 Rh4-h6
Qe3xg3 Rh6-g6 Bd2xh6 386 (3.015625)

Stopped at 9/2.

  1. Re3-g3

My move is Rg3. Boy, you are in trouble.

00:01:00 5631786 nodes NPS: 93525.369499



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