Author: Robert Hyatt
Date: 12:34:25 06/17/98
Go up one level in this thread
On June 17, 1998 at 14:14:08, Peter McKenzie wrote:
>Greetings,
>
>In a recent post Bob Hyatt posted the following results for the Bratko Kopec
>test, using Crafty to search all positions to a fixed depth of 9 plies:
>
>Positions Searched...... 24
>Number right............ 19
>Total Nodes Searched.... 34,195,500
>
>I tried this on my program lambChop, and got the following results:
>
>Positions Searched...... 24
>Number right............ 18
>Total Nodes Searched.... 232,925,032
>
>So my program searched almost 7 times as many nodes!
>
>What sort of numbers do other programs give?
>Is Crafty's node count typically pretty low compared to others?
>
>Maybe mine has some bugs, or maybe I'm doing too many extensions or maybe
>my q-search is too big, or ....
>
>My search uses R=2 null move pruning, or at least its supposed to :-)
>Transposition table size was 0.5 million entries.
>
>I'm not sure what the standard way of counting nodes is, this is how I
>do it: I increment my node count in my MakeMove routine, so my node count
>includes the q-search. I don't count nullmoves as I have a separate
>MakeNullMove routine.
>
>cheers,
>Peter
How about this:
Pick a position from the first 12 test cases, ignoring number one which
should never have been in the test, and then run the test position for
depth=1, then 2, then 3, then 4, and so forth, and publish the node counts
here. I'm fixing to do the same... in fact, here are my numbers for
position #5, from 1 to 10 plies deep:
depth total nodes
1 61
2 299
3 1,939
4 9.052
5 41,606
6 121,430
7 459,585
8 1,244,527
9 2,935,151
10 6,494,133
those are using a 12mb hash table (crafty) and a 3m pawn hash
table. the 10 ply search took 1:16 (all were run with one cpu).
these node counts are the *total* node counts, so the 10 ply
count includes all the ones before it, plus the nodes added by
the 10 ply iteration...
Bob
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