On 22-05-17 17:47, Erik van der Werf wrote: > On Mon, May 22, 2017 at 3:56 PM, Gian-Carlo Pascutto <g...@sjeng.org > <mailto:g...@sjeng.org>> wrote: > > Well, I think that's fundamental; you can't be wide and deep at the same > time, but at least you can chose an algorithm that (eventually) explores > all directions.
Right. But I'm uncomfortable with the current setup, because many options won't get explored at all in practical situations. It would seem logical that some minimum amount of (more spread) search effort would plug enough holes to stop bad blunders, but finding a way to do that and preserve strength seems elusive so far. > BTW I'm a bit surprised that you are still able to find 'big tactical > holes' with Leela now playing as 8d KGS I've attached an example. It's not the prettiest one (one side has a 0.5 pt advantage in the critical variation so exact komi is an issue), but it's a recent one from my mailbox. This is with Leela 0.10.0 so you can follow along: Leela: loadsgf tactics2.sgf 261 = Passes: 0 Black (X) Prisoners: 7 White (O) to move White (O) Prisoners: 19 a b c d e f g h j k l m n o p q r s t 19 . X O O . . . . . . . O O X X X O X . 19 18 . X X O O . . . . O O O X X X O O . O 18 17 . . X X O . . . O O X O O X . X O O . 17 16 . . X O O . . O O X X X X . . X X X . 16 15 . . X O . . O X X X X . . . . . X . X 15 14 . . . X O . O X O O O X . X X O O X(X)14 13 . . . X O O O O O X X X X O O X X X O 13 12 . . . . X X . O X X O O X O . O O X O 12 11 . . . . . . . O O X O X X O . . O O O 11 10 . . . X . X X O O O O O X O O O O . . 10 9 . . . . X . X X O . O X O X X X O . . 9 8 . . . . X . X O . . O X O O X O . . . 8 7 X X X X O X X O . O O X O X X O O . . 7 6 O O O O O O O . . . O X O . X X O . . 6 5 X O O . X O O O O O X X X X X O . . . 5 4 X X O O O X X O . O X X . X O O . . . 4 3 X . X X X X O . O . O X . . X O . . . 3 2 X O X . . O O . O . O O X X X O O . . 2 1 . X . O O . . O O . O X X . X X O . . 1 a b c d e f g h j k l m n o p q r s t Hash: 106A3898CEC94132 Ko-Hash: 67E390C41BF2577 Black time: 00:30:00 White time: 00:30:00 Leela: heatmap = 94.46% G11 4.20% C1 1.31% E2 0.03% all other moves together Note that O16 P17 N15 wins immediately. It's not that Leela is completely blind to it, because that sequence is in some variations. But in here, O16 won't get searched for a long time (it is actually the 4th rated move) due to the skewed probabilities. Leela: play w g11 = Leela: heatmap = 99.9% F11 0.1% C1 0% all other moves together Leela: genmove b .... Score looks bad. Resigning. = resign https://timkr.home.xs4all.nl/chess2/resigntxt.htm If black plays O16 instead here he wins by 0.5 points. -- GCP
tactics2.sgf
Description: application/go-sgf
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