Search found 138 matches

by Stephen Ham
Sat Aug 24, 2019 4:06 am
Forum: Computer Chess Club: General Topics
Topic: Fortress Detection and Evaluation
Replies: 13
Views: 330

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: 13
Views: 330

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: 13
Views: 330

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: 13
Views: 330

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: 1945

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: 642

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: 3440

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...
by Stephen Ham
Fri May 10, 2019 7:22 pm
Forum: Computer Chess Club: General Topics
Topic: Opposite Color Bishop Endgames
Replies: 43
Views: 3440

Re: Opposite Color Bishop Endgames

One should remember that the design goal of engines is in general not to be good at chess, but just to have a high Elo. If worse programs score better in games, it is preferred to make them worse. Hi HG, Those are indeed words of wisdom. That's why I post here, to learn such wisdom. I knew that was...
by Stephen Ham
Fri May 10, 2019 4:48 am
Forum: Computer Chess Club: General Topics
Topic: Opposite Color Bishop Endgames
Replies: 43
Views: 3440

Opposite Color Bishop Endgames

Hello All, The following 8-piece endgame just arose in a Raubfisch X40a3-Cfish match: [d]4b3/8/6k1/6p1/p6p/K3B1P1/8/8 w 01 Virtually all humans immediately see that this is a draw. White will exchange pawns and then sac his Bishop for Black's dark-squared pawn, leading to a King versus King, Bishop,...
by Stephen Ham
Mon May 06, 2019 1:10 am
Forum: Computer Chess Club: General Topics
Topic: asmFish
Replies: 35
Views: 5634

Re: asmFish

Thanks for your valued input, Syzygy. Rather than overall playing strength, I was instead testing tactical acuity. In that 100 game match with long TC, asmFish/PedantFish failed. That was a surprise as the test was skewed in its favor, as previously explained, given the latter's roughly 25% speed ad...