Search found 3216 matches

by Sven
Sun Feb 17, 2019 10:30 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On failing high and finding mates
Replies: 14
Views: 484

Re: On failing high and finding mates

I am not sure about your exact problem. An "info" line containing "lowerbound" is not a PV, so there is no need to expect a mate score in it. Maybe I somehow missed your point? in his root search after the first move has been searched it print the UCI output with the word lowerbound, then after the...
by Sven
Sun Feb 17, 2019 10:12 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On failing high and finding mates
Replies: 14
Views: 484

Re: On failing high and finding mates

I am not sure about your exact problem. An "info" line containing "lowerbound" is not a PV, so there is no need to expect a mate score in it. Maybe I somehow missed your point? Now I see your point, you worry about something like a score ">= 29875" followed by a score ">= 2883" or similar, within t...
by Sven
Sun Feb 17, 2019 8:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On failing high and finding mates
Replies: 14
Views: 484

Re: On failing high and finding mates

in your search futility pruning and history pruning ends with a break; instead of continue; . this is one of the reason why some moves are skipped because sometimes in the search all the non capture moves are skipped even if they are good or check. Unfortunately, changing those to continues doesn't...
by Sven
Sun Feb 17, 2019 8:10 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On failing high and finding mates
Replies: 14
Views: 484

Re: On failing high and finding mates

it looks to me you have some kind of strange, but probably easy to find, BUG in your search. it looks to me that you are returning the real PV in your search and I would assume that in my analysis. at depth 30 your engine report the following PV with evaluation +30: info depth 30 seldepth 56 score ...
by Sven
Fri Feb 08, 2019 6:05 pm
Forum: Computer Chess Club: General Topics
Topic: Glad we are back online!
Replies: 11
Views: 904

Re: Glad we are back online!

Same here :-)

Does anyone know what had happened? Downtimes of about one day are quite unusual ...
by Sven
Thu Jan 31, 2019 8:00 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: CEO. Edition II.
Replies: 19
Views: 807

Re: CEO. Edition II.

Jumbo would like to play for Germany as well, if possible.
by Sven
Sat Jan 19, 2019 10:45 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On-line engine blitz tourney January
Replies: 19
Views: 1558

Re: On-line engine blitz tourney January

Here are the Jumbo 0.6.96 games of this tourney. Round 8 was not played, the opponent was not present. [Event "ICS rated blitz match"] [Site "winboard.nl"] [Date "2019.01.19"] [Round "-"] [White "Jumbo"] [Black "Rookie"] [Result "1/2-1/2"] [WhiteElo "1537"] [BlackElo "1872"] [TimeControl "300+1"] [A...
by Sven
Thu Jan 17, 2019 9:55 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Swiss Tournament. Edition VII. Group B.
Replies: 31
Views: 1410

Re: Swiss Tournament. Edition VII. Group B.

Hi Sergio, please update Jumbo to 0.6.96.
by Sven
Wed Jan 16, 2019 11:38 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Impact of Aspiration on tree size
Replies: 6
Views: 620

Re: Impact of Aspiration on tree size

I did some tests on several features of my engine (Java based) and was wondering if the impact of Aspiration search make any sense. My engine is still simple and uses AlphaBeta (fail-hard), PVS, TT, Null Move, Reverse Futility Pruning, Razoring, Mate Distance Pruning, Minor Promotion Pruning, Late ...
by Sven
Sun Jan 13, 2019 5:52 pm
Forum: Computer Chess Club: General Topics
Topic: Jumbo 0.6.96
Replies: 0
Views: 412

Jumbo 0.6.96

I have released a new Jumbo version: 0.6.96 In my testing with ultra-fast games it played about 30 Elo points stronger than the last release, 0.6.66.