Search found 326 matches

by noobpwnftw
Wed Jul 31, 2019 7:45 am
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

the back-propagation algorithm came up with the scores in the first place, one shouldn't try to put chickens back into eggs But if 10...Qc7 eventually leads to a score of 0.00 while 10...O-O leads to a score of -0.05 and 10...Nb7 leads to a score of -0.02, against white's best play, surely Qc7 shou...
by noobpwnftw
Wed Jul 31, 2019 3:10 am
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

My scores are evaluations of moves at current position, in relation to those of other moves of the same position, they have no meaning to any subsequent positions their corresponding moves may lead to(the back-propagation algorithm came up with the scores in the first place, one shouldn't try to put...
by noobpwnftw
Wed Jul 31, 2019 12:43 am
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

Ferdy wrote:
Tue Jul 30, 2019 2:45 pm
See there is no 'winrate'. Its winrate should have been 0.0 assuming winrate has a range [0, 100], %.
There is no winrate field for mate scores or exact TB scores(not yet available). It is by design.
by noobpwnftw
Mon Jul 29, 2019 8:11 pm
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

Very interesting, thank you very much. One question: When I find a leaf in the tree (position after last given move not found) does it mean that this was evaluated with Stockfish depth 22 and no other analysis starting from that position was performed? Yes. As an anecdote: I played a Lichess blitz ...
by noobpwnftw
Mon Jul 29, 2019 1:44 am
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

Nice work, Noob. Sounds like you've got 35-40 million games in that database. Any word on the composition, i.e. % human, % engine? This work would be greatly improved with a custom GUI that included your evaluation data, the empirical WLD data (flawed though it may be) and information on who played...
by noobpwnftw
Sun Jul 28, 2019 4:35 pm
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

My weighted averaging function also factors in the number of good reply moves so that it can tell the difference between different 0.00 lines and apply penalties accordingly, also gradually degrade sharp scores to prevent the back-propagation becoming fully min-maxed. Regardless of how you want to a...
by noobpwnftw
Sun Jul 28, 2019 2:12 pm
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

For those who want to probe my database locally or for other unspecified reasons, here is a full database snapshot of my book project as of today: ftp://ftp.chessdb.cn/pub/chessdb/data-snapshot-20190728.tar The database contains about 3 billion unique chess positions, mostly connected to startpos, ...
by noobpwnftw
Sun Jul 28, 2019 2:09 pm
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

analyzed by Stockfish with no less than 22 plies at terminal node Interesting, my private database uses depth 22 as well, looks like we found it to be optimal (depth 21 having considerably less quality, depth 23 being consirerably more slow) independently? I tried to probe from startpos with the fo...
by noobpwnftw
Sun Jul 28, 2019 7:10 am
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

In board unit above, if there are more than 3 empty spaces, the first unit is set to 8 and the next unit is the number of empty spaces minus 4.
And correction: turn is a 8-bit flag, instead of 1.
by noobpwnftw
Sun Jul 28, 2019 3:58 am
Forum: Computer Chess Club: General Topics
Topic: Database snapshot
Replies: 76
Views: 4546

Re: Database snapshot

Binary FEN encoding has the following format: <board unit>...<board unit><turn><special unit>...<special unit> Where each board unit has a 8-bit value of: 0 = 1 empty space 1 = 2 empty spaces 2 = 3 empty spaces 3 = p 4 = n 5 = b 6 = r 7 = q 8 = unused to avoid ambiguity 9 = k a = P b = N c = B d = R...