Search found 62 matches
- Sat Jul 31, 2010 00:23
- Forum: Checkers
- Topic: Wow is this section dead or what?
- Replies: 2
- Views: 7086
Wow is this section dead or what?
No posts since 2002?
- Wed Jul 28, 2010 00:17
- Forum: Draughts, Computer, Internet
- Topic: Node Count Plus
- Replies: 1
- Views: 1944
Node Count Plus (18)
PERFORMING NODE COUNT THROUGH DEPTH 18 ================================================================= --------------------------------- Node Count Through 18 Plies Completed |---| w |---| w |---| |---| | --------------------------------- Nodes from move # 1 = 550829166472 | w |---| w |---| |---|...
- Tue Jul 27, 2010 00:26
- Forum: Draughts, Computer, Internet
- Topic: Node Count Plus
- Replies: 1
- Views: 1944
Node Count Plus
It occurred to me that: 1. perft is an unusual name for a function that performs a node count. It comes from Dr. Hyatt's Cray Blitz chess code (later Crafty) which he called "Performance Test", and, as usual back in those days, the name was truncated for use on a text-based programmatic interface. 2...
- Sun Jul 25, 2010 23:55
- Forum: Draughts, Computer, Internet
- Topic: BikMove v1.1
- Replies: 7
- Views: 4486
Re: BikMove v1.1
What do you mean exactly by "6-piece perfect play databases" ? I guess it is the optimisation of the distance to win but I am not familiar with checkers rules. Hi, Yes, I solved "Distance to Win" for the 6-piece database (and larger databases) for checkers. This is different from your "Distance to ...
- Sun Jul 25, 2010 15:57
- Forum: Draughts, Computer, Internet
- Topic: BikMove v1.1
- Replies: 7
- Views: 4486
Re: BikMove v1.1
By the way, I gave Jon Kreuzer, the GUI Checkers author, my 6-piece perfect play databases and the access code to probe them in RAM (over a year ago actually).
He says it plays much better with them.
I see he has not released it yet, I sent him an email inquiring about it.
He says it plays much better with them.
I see he has not released it yet, I sent him an email inquiring about it.
- Sat Jul 24, 2010 00:06
- Forum: Draughts, Computer, Internet
- Topic: My perft_per_ply() code
- Replies: 0
- Views: 1792
My perft_per_ply() code
void perft_per_ply(unsigned short depth, unsigned short white_to_move) { unsigned short number_of_legal_moves, i; unsigned long long total_nodes = 0; unsigned long long nodes_per_ply[MAX_LEGAL_MOVES_POSSIBLE_PER_POSITION]; CHECKERS_POSITION array_of_legal_moves[MAX_LEGAL_MOVES_POSSIBLE_PER_POSITION...
- Fri Jul 23, 2010 23:58
- Forum: Draughts, Computer, Internet
- Topic: Perft(19) Divide
- Replies: 1
- Views: 2024
Re: Perft(19) Divide
and now 2,041,959,240,377 agrees with yours as well.
- Fri Jul 23, 2010 23:45
- Forum: Draughts, Computer, Internet
- Topic: perft for 8x8 checkers (depth 24)
- Replies: 4
- Views: 3245
Re: perft for 8x8 checkers (depth 24)
Here are my perft with divide numbers that I recently re-computed to make sure they matched Aart's numbers. I just made this subject line so Aart would raise his eyebrows the next time he logs in, I did not computer perft(24) :) I can appreciate that sense of humor. I almost started my perft(25) co...
- Fri Jul 23, 2010 02:47
- Forum: Draughts, Computer, Internet
- Topic: Perft(19) Divide
- Replies: 1
- Views: 2024
Perft(19) Divide
I have confirmed this number for perft(19):
12-16: 2,517,202,147,314
Still doing the other 6 now
12-16: 2,517,202,147,314
Still doing the other 6 now
- Fri Jul 23, 2010 01:02
- Forum: Draughts, Computer, Internet
- Topic: perft for 8x8 checkers (depth = 22)
- Replies: 8
- Views: 5107
Re: perft for 8x8 checkers (depth = 22)
Well, I have a 3.9 GHz Intel Core i7-860 x 4 processors with 8 GB of RAM. If I run your program with a much larger hash, say 2 GB or 4GB, I should get an even bigger performance increase (more hash entries) so it should even be faster, correct? Email it to me and I will run it. I would be curious to...
- Fri Jul 23, 2010 00:53
- Forum: Draughts, Computer, Internet
- Topic: perft for 8x8 checkers (depth 24)
- Replies: 4
- Views: 3245
Re: perft for 8x8 checkers (depth 24)
But I WAS using my small board diagrams 
My really big ones are online for my database generator.

My really big ones are online for my database generator.
- Thu Jul 22, 2010 13:19
- Forum: Draughts, Computer, Internet
- Topic: perft for 8x8 checkers (depth = 22)
- Replies: 8
- Views: 5107
Re: perft for 8x8 checkers (depth = 22)
perft(16) 165629569428 nodes, 149.60s, 1107.15 Mnps perft(17) 758818810990 nodes, 522.30s, 1452.84 Mnps perft(18) 3493881706141 nodes, 1851.01s, 1887.55 Mnps perft(19) 16114043592799 nodes, 6465.48s, 2492.32 Mnps perft(20) 74545030871553 nodes, 22457.55s, 3319.38 Mnps perft(21) 345100524480819 node...
- Thu Jul 22, 2010 13:01
- Forum: Draughts, Computer, Internet
- Topic: perft for 8x8 checkers (depth 24)
- Replies: 4
- Views: 3245
perft for 8x8 checkers (depth 24)
Hello everyone, Here are my perft with divide numbers that I recently re-computed to make sure they matched Aart's numbers. I just made this subject line so Aart would raise his eyebrows the next time he logs in, I did not computer perft(24) :) I also started at depth 16 since there was "too much te...
- Thu Aug 06, 2009 01:22
- Forum: Draughts, Computer, Internet
- Topic: EndGame Databases
- Replies: 289
- Views: 137064
I also remember reading that "fopen()" is now one of those "old-time" function calls, and it has been made "obsolete" but still able to be accessed.BertTuyt wrote: What I now do is to open ( fopen() )
I forget what the name of the new routine is, I think fopen64(). Same goes for fclose() and fseek(), etc.
- Thu Aug 06, 2009 01:19
- Forum: Draughts, Computer, Internet
- Topic: EndGame Databases
- Replies: 289
- Views: 137064
Im now confronted with a limitation of opened files in Windows. Apparently this limit is 512 and can be set to 2048, but thats the upper maximum. Bert This sounds familiar. I only use a maximum of 400 files for all 10-piece database slices in 8x8 checkers, but I encountered it elsewhere on another ...