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High similarity is evidence, but low similarity is absence of evidence rather than evidence of absence. If the nets are different, the case might be made that the nets really are this different from each other, but if my understanding is correct, Rubi and Minic use explicitely the same NNUE net (so ...

Stability of an engine eval from depth to depth is achieved by requiring a new best move to be searched to the same depth as the previous best move. In ChessDB, you'll get the minimum leaf eval of 22, but otherwise a tree with a handful of nodes can be backed up to the root and through minimaxing ta...

Nvidia changed the definition of CUDA cores. You need a workload that fully saturates the FP32 units to get close (but not quite) to the effect the same number of CUDA cores would have had in Turing. 1 CUDA in Turing : 1xFP32 unit + 1xINT32 unit able to execute concurrently 2 CUDA in Ampere : 1xFP32...

The only true values of a chess position are draw and mate in X. A score like 150cp is always incorrect from a chess truth perspective, it's only a useful approximation for humans and engines to denote a position that's very difficult to hold, maybe losing by force, maybe not. So of course it can't ...

Material eval is too wrong to be of any use. There is one situation where skipping eval to just search nodes might be worthwile, and that's to find mate when down a lot of material, as pruning engine have trouble with them. But just doing a "find short mates" extension to all leaves isn't going to c...

ChessDB's SF sometimes gets updated, it's currently using a NNUE-based SF version. I'm not sure it makes a massive difference for the task of busting the Grob, though. Let us know what your Stockfish search suggests in the Bxg4 line as a defense for white. Also, while the DB wouldn't automatically t...

Brainfish author has stopped development immediately after NNUE release https://zipproth.de/Brainfish/download/ No. He stopped developping Brainfish as a Stockfish fork, because Stockfish includes large-page support and CFish includes it and the ability to use multiple books from Brainfish. And CFi...

carangelmx wrote: ↑

Thu Sep 03, 2020 3:56 pm

In addition, is there a description of the contents of the db? I mean, just opening theory, or some middlegame/endings too.

Any position with 5 or more non-pawn non-king on the board can be evaluated by ChessDB.

The leaf evals are depth 22, but the tree is massive. As you know, a depth 80 search with SF doesn't mean looking at depth 79 all children, then depth 78 all their children... There is a lot of reductions on all moves that look bad. Searching a million nodes with depth 22 leaves can be quite competi...

5.8.0 has been released. Here a small tournament with famous names, but ultra quick time control: # PLAYER : RATING ERROR POINTS PLAYED (%) W D L D(%) CFS(%) 1 Stockfish 11 64 : 752 16 9004.0 10007 90.0 8410 1188 409 11.9 100 2 Ethereal 12.55 (POPCNT) : 621 14 7912.0 10005 79.1 7213 1398 1394 14.0 ...