Search found 17513 matches

by hgm
Fri Mar 22, 2019 8:21 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Evaluation without material count
Replies: 3
Views: 246

Re: Evaluation without material count

Well, the 'bug' would be that Fairy-Max doesn't have contempt, and quasi-randomizes its first few moves. The randomization often picks moves that Fairy-Max itself would consider bad, and especially with black this then brings it in a position where it considers itself at a disadvantage. It is then h...
by hgm
Thu Mar 21, 2019 6:37 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Minimax, noisy evaluations, PUCT
Replies: 1
Views: 244

Re: Minimax, noisy evaluations, PUCT

Note that the oscillation is the opposite from what seems reasonable: it puts the side to move in the leaves at a disadvantantage. In reality one would expect that side to have the advantage. A side-to-move bonus in the static eval could cure this.
by hgm
Mon Mar 18, 2019 6:28 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: delaying tactics: prune or extend?
Replies: 5
Views: 496

Re: delaying tactics: prune or extend?

It is not my intention to drop it, but I was very busy with other things the past days, and this requires some quiet thinking. I will get back to it.
by hgm
Sun Mar 17, 2019 5:31 pm
Forum: Computer Chess Club: General Topics
Topic: chessvariants.com down?
Replies: 1
Views: 110

Re: chessvariants.com down?

For me it stopped working yesterday evening too. Last time this happened it had something to do with their disk quota being exceeded because of automatic back-ups. I guess we will have to wait until Fergus disovers the problem, and figures out how to solve it.
by hgm
Sun Mar 17, 2019 10:58 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Depth reduced but ELO increased
Replies: 3
Views: 305

Re: Depth reduced but ELO increased

It is quite easy to enormously increase depth by hugely reducing non-PV moves, but at some point this will backfire, because the engine will be blind even to shallow tactics that would refute its PV. One can also reduce too much. And if strength can go down by reducing more, it is not really remarka...
by hgm
Sun Mar 17, 2019 9:46 am
Forum: Computer Chess Club: General Topics
Topic: Playing the endgame like a boss !!
Replies: 35
Views: 1527

Re: Playing the endgame like a boss !!

The problem is that training purely for win probability is not consistent. Even if at some point it would know perfectly how to win KRK, the training would up the value of the long wins, making it more difficult for the engine to actually find those wins. This makes the inability to find the long wi...
by hgm
Sun Mar 17, 2019 7:21 am
Forum: Computer Chess Club: General Topics
Topic: Playing the endgame like a boss !!
Replies: 35
Views: 1527

Re: Playing the endgame like a boss !!

Of course it is not an intrinsic NN problem. The evaluation you need to swiftly win KRK even with a very shallow search is extremely simple (centralization bonus for the Kings, somewhat larger for the bare one, through PST will already do). A NN as complex as that of Leela can very easily calculate ...
by hgm
Sat Mar 16, 2019 10:35 pm
Forum: Computer Chess Club: General Topics
Topic: Playing the endgame like a boss !!
Replies: 35
Views: 1527

Re: Playing the endgame like a boss !!

You are of course right in that case, although it is debatable whether a win is truly a win if it doesn't achieve an all-vs-nothing score. I was thinking of games with a binary result, plus perhaps a draw. Things can be very different in games where the goal is to collect points, especially if the s...
by hgm
Sat Mar 16, 2019 10:21 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: On-line engine blitz tourney March
Replies: 13
Views: 483

Re: On-line engine blitz tourney March

:Tourney Players: Round 9 of 9 : : Name Rating Score Perfrm Upset Results : ----------------- ------ ----- ------ ------ ------- : 1 +NightmareX [1982] 12.0 [2150] [ 57] +20w +11w =06b =05w =07b +03w =04b +02w +08b : 2 +WaspX [1982] 11.0 [2011] [ 57] +09w +12w =07b =06w +05b =04w =08b -01b +13w : 3...
by hgm
Sat Mar 16, 2019 8:29 pm
Forum: Computer Chess Club: General Topics
Topic: Playing the endgame like a boss !!
Replies: 35
Views: 1527

Re: Playing the endgame like a boss !!

An example from the monthly blitz where it is not so lucky to diffuse into a winning conversion, while aimlessly moving from one 'certain win' to another... [Event "ICS Rated blitz match"] [Site "winboard.nl"] [Date "2019.03.16"] [Round "-"] [White "LeelaRB"] [Black "Marvin"] [Result "1/2-1/2"] [Whi...