[D]2r1r1k1/1pq2pp1/p2p2b1/P2P4/2P5/3p1P1P/P2Q1BP1/2R1R1K1 w - - 0 26
Uri Blass wrote:
The following position happened in one of my games and I believe it is probably a draw so I would like to see computers evaluate it closer to draw inspite of the fact that white is a pawn up in case that I use a special personality.
The game is already at move 39 of white and I do not ask for advice in a specific game but only for personality that is going to be against opposite color bishops if I try to win.
Uri
Stockfish doesn't apply any scaling to position you posted. The problem of evaluating the opposite colored bishops is that in endgame they certainly reduce winning chances, but in midgame positions opposite colored bishops often increase attacking chances.
In position you posted white could speculate on using a1-h8 diagonal for attacking with bishop + queen and at the same time speculate playing c5 for creating passed pawn. If he had time to accomplish this he would likely be winning. Deep search will probably reveal that in this specific position this plan won't work (because of open e-file and strong black passer). But it's impossible to identify this by simple static evaluation() call. So I'm afraid that although drawish heuristic you suggest might improve play in this specific position, it could do harm in others very similar positions.
Alexander Schmidt wrote:Hmmm, it crashes here in Chess960, just in games where kings and rooks are on their usual position it works..
You are right.
This is an extremely stupid and embarrassing bug. Chess960 did work some time back, but apparently we broke it later. I've fixed the bug now, but will run some tests to make sure there are no other bugs before we release a new version.
Rush hour of the chess engines! Fritz 12, Shredder 12, Stockfish 1.5. The Stockfish Triad wrote a new source, Jim Ablett compiles at lightning speed and lo and behold, a new engine was born, well bedded into the world wide standard of SMKs UCI and into a smart GUI of your choice. In some way I feel almost guilty, because I've got a very nice present from hard working people putted into my empty hands. Thank you very much. Here fits Franz Beckenbauer's (a German socker legend) slogan: is it already Christmas?
Cheerio Rainer
Alexander Schmidt wrote:Hmmm, it crashes here in Chess960, just in games where kings and rooks are on their usual position it works..
You are right.
This is an extremely stupid and embarrassing bug. Chess960 did work some time back, but apparently we broke it later. I've fixed the bug now, but will run some tests to make sure there are no other bugs before we release a new version.
Thanks for the bug report.
I made the buggie change , but is not very new, probably few months ago (I am not at home and I cannot browse the revision's history now), perhaps even earlier then 1.4 that didn't work for other reasons.
I agree we really need to release a manteinance release when 960 works for sure of course.
Alexander are you able to compile sources yourself ? I could send you tomorrow the new sources with the proposed fix and so you can test and confirm bug is fixed for you. In this case is better a test more (from the bug reporter) then less so we are really sure we don't have other surprises...
Alexander Schmidt wrote:Hmmm, it crashes here in Chess960, just in games where kings and rooks are on their usual position it works..
You are right.
This is an extremely stupid and embarrassing bug. Chess960 did work some time back, but apparently we broke it later. I've fixed the bug now, but will run some tests to make sure there are no other bugs before we release a new version.
Thanks for the bug report.
I made the buggie change , but is not very new, probably few months ago (I am not at home and I cannot browse the revision's history now), perhaps even earlier then 1.4 that didn't work for other reasons.
No, it's later than 1.4. Stockfish 1.4, where Chess960 didn't work, was released on July 4. Chess960 support was fixed on July 10. The new bug was introduced on July 23.
Clearly, we should run Chess960 test games a little more often.
