Search found 1080 matches

by lech
Sat May 15, 2010 1:44 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

All the proposed patch attempts do work well with this position. Except the patches from SF team, because, so far, they haven't shown any. 8-) I don't have any patch to show, sorry. Actually I am not very interested in tweaking for a given position. I consider good a patch that proves to increase s...
by lech
Fri May 14, 2010 7:00 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

All mentioned above patches don’t work with my new position. Only change of value “Passed Pawns (endgame)” gives result. In my opinion, a pawn on 7(2) line is no longer the same pawn. :wink: Nothing special compared to the other examples. Why shouldn't it work? don't work = to play moves like Kg7->...
by lech
Fri May 14, 2010 2:42 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

I found the next position which SF 171 (default options +zugzwang detection) can’t win (probably all other engines too :cry: ). It took me a little time because I had wanted to find an extreme simple and obvious example. [d] 8/6kP/1p6/p7/Pr6/K2B4/8/8 b - - 0 1 1...Rh4 2.Kb3 Kf6 3.Kc3 Ke5 (the rest ...
by lech
Fri May 14, 2010 12:00 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

I found the next position which SF 171 (default options +zugzwang detection) can’t win (probably all other engines too :cry: ). It took me a little time because I had wanted to find an extreme simple and obvious example. [d] 8/6kP/1p6/p7/Pr6/K2B4/8/8 b - - 0 1 1...Rh4 2.Kb3 Kf6 3.Kc3 Ke5 (the rest i...
by lech
Wed May 12, 2010 11:10 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

Thanks Sven, I understood you. I compiled SF without the line 906 and I will try to test it (some, created by me, positions). :wink:
by lech
Wed May 12, 2010 9:20 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

One should almost never consider changing code because of one test position :) 100 point bonus [passed pawns (endgame)] makes correct play more difficult (time-consuming) or impossible, if opposite Pawn reached 7(2) line, and King should be active. Example (one of many tested by me): [d] 8/6kP/1p4B...
by lech
Wed May 12, 2010 5:12 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

One should almost never consider changing code because of one test position :) 100 point bonus [passed pawns (endgame)] makes correct play more difficult (time-consuming) or impossible, if opposite Pawn reached 7(2) line, and King should be active. Example (one of many tested by me): [d] 8/6kP/1p4B...
by lech
Mon May 10, 2010 12:31 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

[d] 8/P7/4k3/8/5P2/4Bq2/5P2/5K2 b - - 0 1 1…Kf5 2.Ke1(g1) Qd5 3.Kf1 (3.Ke2 Kg4) Ke4 4.Kg2 (4.Ke2 Qa2+) Qg8+ 5.Kf1 Kf3 6.Ke1 Qa2 7.Kd1 Ke4 8.Ke1 Kd3 9.Kf1 Qd5 10.Kg1 Ke2 win Probably all engines would play 1…Kd7 ?? :( Monte Carlo Analysis in Rybka 4: yields precise evaluations by playing thousands of...
by lech
Sat May 08, 2010 11:20 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

The both positions are “probably :wink: ” won for black, but it is not easy. However, the default value of “passed pawns (endgame)” should remain “100”. :oops: I tested same positions with possibilities to get a passed pawn in endgame. I used SF 1.7.1 and Fire 1.2. Fire seems to be more careful than...
by lech
Sat May 08, 2010 12:53 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Passed Pawns (endgame)
Replies: 142
Views: 16688

Re: Passed Pawns (endgame)

My suggestion: This option may be: „possibility to get passed pawn (endgame)” (default 100), but when such a pawn already exists, not to add any bonus.