Search found 134 matches

by Stephen Ham
Thu Apr 04, 2019 9:27 pm
Forum: Computer Chess Club: General Topics
Topic: Raubfisch
Replies: 43
Views: 4994

Re: Raubfisch

Dear gents, There's a lot not to like, and more to be suspicious about Raubfisch, including fake/joke names of the author(s) and engine versions, plus violation of the GPL. Nonetheless, my match between the latest iterations of Raubfisch (RF) and Stockfish (SF) (see previous posts for match specs) h...
by Stephen Ham
Thu Apr 04, 2019 1:40 am
Forum: Computer Chess Club: General Topics
Topic: Raubfisch
Replies: 43
Views: 4994

Re: Raubfisch

Hi Dann, As stated in my post, I'm using the latest SF iteration, and yes, it's from that same "abrok" link you posted. "Frankenfisch"...or whatever Raubfisch truly is, nonetheless leads Stockfish in my 100-game match after 88 games. While RF's 1-victory lead at this point is statistically immateria...
by Stephen Ham
Wed Apr 03, 2019 11:30 pm
Forum: Computer Chess Club: General Topics
Topic: Raubfisch
Replies: 43
Views: 4994

Re: Raubfisch

Dear gents, I continue to test Raubfisch (RF) against Stockfish (SF) using the latest iterations, just out of curiosity. Presently I'm running a 100-game match with a time-control of 30'+2" where both engines use the same opening book I created, leading to very sharp middlegames. After 85 games, RF ...
by Stephen Ham
Sun Dec 23, 2018 11:28 pm
Forum: Computer Chess Club: General Topics
Topic: Raubfisch
Replies: 43
Views: 4994

Raubfisch

Dear friends, I look to you chess engine experts to educate me regarding chess engine strengths. That said, I'm surprised at the lack of posts regarding Raubfisch (RF). https://chess.massimilianogoi.com/download/raubfisch/ Yes, the name is suspicious. It admits to being a derivative of Stockfish (SF...
by Stephen Ham
Wed Jul 11, 2018 3:13 am
Forum: Computer Chess Club: General Topics
Topic: A template for a centaur chess forum
Replies: 2
Views: 463

Re: A template for a centaur chess forum

Thanks Ozymandias (great name as I enjoy the poem about you).

I registered and so hope to see some activity there. I'm an ICCF GM who has considered participating in Centaur competitions.

All the best,
Steve
by Stephen Ham
Sun Jul 08, 2018 6:03 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish's Asymmetric Evaluations
Replies: 15
Views: 1738

Re: Stockfish's Asymmetric Evaluations

Dear Dann, Thank you so VERY much for your kindness in creating a SF analysis engine. Back in the days when Rybka was marketed, Vas commented that he wanted Rybka to be an analysis engine first, and a game-playing engine second...or something akin to that. So, while free SF isn't being marketed, it ...
by Stephen Ham
Fri Jul 06, 2018 4:53 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish's Asymmetric Evaluations
Replies: 15
Views: 1738

Re: Stockfish's Asymmetric Evaluations

Dann, as a follow up, SF analyzed two plies deeper after 21' 57" and still selected move X with an evaluation of 0.00. Given non-determinism from using 4-cores, it's possible that if I were to test again for the same period, I'd get different results. Nonetheless, it's interesting that roughly 20 mi...
by Stephen Ham
Fri Jul 06, 2018 4:39 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish's Asymmetric Evaluations
Replies: 15
Views: 1738

Re: Stockfish's Asymmetric Evaluations

Thanks again for your valued input, Dann. I didn't realize that SF's contempt factor of 21 merely added 21 to the evaluation. Is that truly how it attempts to avoid draws? If so, then how does that make any sense? After all, since increased contempt is an anti-draw algorithm, then how does increasin...
by Stephen Ham
Fri Jul 06, 2018 2:42 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish's Asymmetric Evaluations
Replies: 15
Views: 1738

Re: Stockfish's Asymmetric Evaluations

Hi Dann, Thanks for your reply. You wrote, "If you are analyzing rather than game playing, make sure that you set the contempt to zero. There is a built in offset for the side to move, otherwise." Yes, I'm analyzing in Infinite Analysis, but I don't see how contempt is a factor since Black is given ...
by Stephen Ham
Fri Jul 06, 2018 12:51 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish's Asymmetric Evaluations
Replies: 15
Views: 1738

Stockfish's Asymmetric Evaluations

Dear gents, In the last few months, I've perceived numerous examples of asymmetric evaluations from Stockfish. For example, in the following position: r2r2k1/pp2n1b1/2ppqnpp/4p3/1PP1P3/1QNR1PP1/P3BB2/R5K1 w - - 0 21, Stockfish 270618 selects 21 Rad1 after 20 minutes. It evaluates White having a 0.64...