Search found 141 matches

by Stephen Ham
Thu Sep 12, 2019 7:53 pm
Forum: Computer Chess Club: General Topics
Topic: Leela Output
Replies: 11
Views: 565

Re: Leela Output

Hi Louis and Hamster, Gentlemen, thanks so much for your valued input. I too have a lot to learn about Leela. For example, I thought it played MCTS in order to generate "learning" from the results of those games. I see from your link, Louis, that it instead uses PUCT. But MCTS is data from actual ga...
by Stephen Ham
Tue Sep 10, 2019 5:43 pm
Forum: Computer Chess Club: General Topics
Topic: Leela Output
Replies: 11
Views: 565

Re: Leela Output

Thank you Louis, Still, using a percentile value is confusing. I suppose 50% means that a draw is forecast. Or does it mean that a 50% chance of victory is predicted? If it's the latter, then that's quite different from the former. What about the chance of loss...is that also 50%? If so, that leaves...
by Stephen Ham
Tue Sep 10, 2019 7:50 am
Forum: Computer Chess Club: General Topics
Topic: Leela Output
Replies: 11
Views: 565

Leela Output

Hello All, I don't have Leela but hope to get it after a hardware upgrade. So, I'm trying to get educated now. In the display found under Nibbler commentary here: http://blog.lczero.org/2019/ what does the 75.4% next to e5 mean? Is that a probability of victory or a probability of being played? If i...
by Stephen Ham
Sat Aug 24, 2019 4:06 am
Forum: Computer Chess Club: General Topics
Topic: Fortress Detection and Evaluation
Replies: 15
Views: 1334

Re: Fortress Detection and Evaluation

Hello again, My initial post mentioned multiple fortress draws, all from positions in an ongoing ICCF game. That said, here's another position that's remote from the present game position: [d]8/5p2/R3bk1p/8/5K2/1p4P1/6P1/8 w - - 0 49 I don't recall what Cfish's evaluation was after a 70 ply search, ...
by Stephen Ham
Sat Aug 24, 2019 3:03 am
Forum: Computer Chess Club: General Topics
Topic: Fortress Detection and Evaluation
Replies: 15
Views: 1334

Re: Fortress Detection and Evaluation

Hello All, Here's one of several fortress positions I've encountered in a present ICCF game - this is a potential future position, quite remote from the actual game: [d]8/1b1q1pk1/1R2p2p/4P1p1/8/4Q3/5PP1/6K1 b - - 0 42 When I first saw this position, I immediately saw this is a fortress draw. So, I ...
by Stephen Ham
Fri Aug 23, 2019 9:54 pm
Forum: Computer Chess Club: General Topics
Topic: Fortress Detection and Evaluation
Replies: 15
Views: 1334

Re: Fortress Detection and Evaluation

Hi Louis, Thanks for your valued input. What about NN engines, Louis? Is it possible that based upon experience derived from playing millions of games, and from learning, that they can detect fortresses and evaluate them as 0.00? I'll be happy to share my fortress FENs. But first, I need to attend a...
by Stephen Ham
Fri Aug 23, 2019 8:58 pm
Forum: Computer Chess Club: General Topics
Topic: Fortress Detection and Evaluation
Replies: 15
Views: 1334

Fortress Detection and Evaluation

Hello All, In one of my ICCF games, my forward looking analyses ran into a couple of positions that I believe are fortresses. I can supply FENs for those positions later, if needed. But at present, my concern is that Cfish 170719 doesn't detect this fortress. So, I've allowed it to run for over thre...
by Stephen Ham
Thu Jun 06, 2019 12:12 am
Forum: Computer Chess Club: General Topics
Topic: Cfish, shiny and new...
Replies: 13
Views: 2083

Re: Cfish, shiny and new...

Thanks, Dann! Since I'm the resident dummy here, please tell me what the clang and gcc suffixes mean. Also, what is the "vanilla" label? Back when I tested Cfish in tactical battles, I saw something strange. Although Cfish was always faster than other engines, its search depth was sometimes less dee...
by Stephen Ham
Tue Jun 04, 2019 4:19 am
Forum: Computer Chess Club: General Topics
Topic: A little more B30 Sicilian
Replies: 4
Views: 689

Re: A little more B30 Sicilian

Hi Eelco,

Perhaps Stockfish's heuristics are similar to Bent Larsen's chess philosophy. He too disliked 3 d4, since it trades the central pawn for a flank pawn. While that seems excessively simplistic, the great GM stated exactly that in his autobiography/book of best games.

All the best,
Steve
by Stephen Ham
Sat May 11, 2019 1:02 am
Forum: Computer Chess Club: General Topics
Topic: Opposite Color Bishop Endgames
Replies: 43
Views: 3872

Re: Opposite Color Bishop Endgames

That is why I posted as I did. In your link, I recall Majid Ansari's post of over five years ago when he wrote: I actually watched SF win a very nice opposite bishop endgame against Houdini. The struggle in the endgame was to avoid a drawn opposite bishop endgame and I thought SF handled it extremel...