Search found 2282 matches

by Michael Sherwin
Mon Mar 30, 2020 4:23 pm
Forum: Computer Chess Club: General Topics
Topic: New RomiChess, soon
Replies: 24
Views: 1368

Re: New RomiChess, soon

RomiChess is an old Winboard engine. So sorry, but no is the answer. However, Romi takes chances and can be beat by lower rated engines and lower rated people. But probably not by a beginner.
by Michael Sherwin
Mon Mar 30, 2020 12:29 am
Forum: Computer Chess Club: General Topics
Topic: New RomiChess, soon
Replies: 24
Views: 1368

Re: New RomiChess, soon

In an interview during her match with Yace Romi was asked, "why are you making so many questionable sacrifices". Romi, "because I can". Romi only drew both games after coming very close to winning them. [Event "Match.at"] [Site "MASTER"] [Date "2020.03.29"] [Round "1"] [White "RomiChess"] [Black "Ya...
by Michael Sherwin
Sun Mar 29, 2020 10:28 pm
Forum: Computer Chess Club: General Topics
Topic: New RomiChess, soon
Replies: 24
Views: 1368

Re: New RomiChess, soon

Tal lives again! Freakin' bazooka, those are some attacking games. Does it do that with black as well? If it does and it has a strength adjustment, this could become my favorite engine to play against. I love engines that create sharp games and sometimes even make somewhat unsound, but interesting ...
by Michael Sherwin
Sun Mar 29, 2020 9:58 pm
Forum: Computer Chess Club: General Topics
Topic: New RomiChess, soon
Replies: 24
Views: 1368

Re: New RomiChess, soon

Tal lives again! Freakin' bazooka, those are some attacking games. Does it do that with black as well? If it does and it has a strength adjustment, this could become my favorite engine to play against. I love engines that create sharp games and sometimes even make somewhat unsound, but interesting ...
by Michael Sherwin
Sun Mar 29, 2020 5:37 pm
Forum: Computer Chess Club: General Topics
Topic: New RomiChess, soon
Replies: 24
Views: 1368

Re: New RomiChess, soon

The final results of this match may decide if new Romi will be released. If you don't release it you'd better stay at home even after the COVID is over. :lol: It does look ripe for release, Mike! Thanks in advance! :D Well I thought about changing ID with a corpse and in the future releasing new ve...
by Michael Sherwin
Sat Mar 28, 2020 5:24 pm
Forum: Computer Chess Club: General Topics
Topic: New RomiChess, soon
Replies: 24
Views: 1368

Re: New RomiChess, soon

The final results of this match may decide if new Romi will be released. RomiChess - Yace : 18.0/29 13-6-10 (0=1=1===10=1110=10=11010=11=1) 62% +85 This is just a phenomenal performance by Romi against Yace. This is the game I woke up to. Romi takes no prisoners. She is reminding me of the RomiChess...
by Michael Sherwin
Fri Mar 27, 2020 4:53 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: I just discovered a design flaw in my engine
Replies: 9
Views: 401

Re: I just discovered a design flaw in my engine

It can mask stalemate in a leaf node, when you think a pseudo-legal move is just bad, rather than illegal. And if beta < 0 being stalemated would be a fail high, while having a bad but legal move would be a fail low. I'm thinking of just making another Qsearch just for the first ply of captures whe...
by Michael Sherwin
Fri Mar 27, 2020 6:05 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: I just discovered a design flaw in my engine
Replies: 9
Views: 401

Re: I just discovered a design flaw in my engine

One example: you detect a draw before you have searched any moves. Now, if the previous move was illegal you don't want to return a draw score. You should return an illegal move indicator of some kind. I return -Illegal, which comes back to the caller (which inverts the score) as the constant Illeg...
by Michael Sherwin
Fri Mar 27, 2020 3:35 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: I just discovered a design flaw in my engine
Replies: 9
Views: 401

Re: I just discovered a design flaw in my engine

jdart wrote:
Fri Mar 27, 2020 3:31 am
In general though, whenever you have any early exit from search, you should take care that you are correctly handling the case of a previous illegal move.
Now I'm confused. What are the considerations?
by Michael Sherwin
Fri Mar 27, 2020 1:36 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: I just discovered a design flaw in my engine
Replies: 9
Views: 401

Re: I just discovered a design flaw in my engine

The design flaw therefore is at the leaf nodes when starting the Qsearch and there is a stand pat score >= beta. An illegal leaf move is not detected. How serious of a flaw is this? In QS, the side to move has a capture move to take the opposite king, which would raise the score to +infinity, i.e. ...