#Developer Build options

23 messages · Page 1 of 1 (latest)

cobalt comet
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Hi there. Today I downloaded the newest developer build of Stockfish and found that in the engine settings in Cutechess there werent just the normal threads, hash, elo..... but also some options named a1 a2 a3 a4 a5 b1 b2 ....... What are these?

raw lark
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Those look like SPSA tuning options

cobalt comet
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SPSA? What does that mean?

raw lark
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The algorithm used to tune values in Stockfish

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Can you execute stockfish manually, type uci, press enter and send everything it says?

cobalt comet
raw lark
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Yeah that is definitely from spsa

low bane
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From where did you download that?

cobalt comet
low bane
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Yeah that’s wrong

marble inletBOT
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dev-builds

The latest builds can be found under 'artifacts' at the bottom of the page.

low bane
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Here’s the latest build

cobalt comet
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how do i download them from this website?

low bane
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You need a GitHub account

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Then at the bottom you can download them

cobalt comet
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and what is the problem with the fishtest ones?

timid knoll
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You downloaded a version intended to be used for tuning instead of one you would usually use. Also most tests fail fishtest, so a random fishtest build is likely worse than dev.

low bane
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You saw exactly what’s wrong

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It has stuff that the real latest dev builds don’t have

cobalt comet
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yeah but the NNUE was the one of the dev build and also i just wanted to know what these options do. Is there a list of the options and there corresponding effects?

timid knoll
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They are some (usually) internal values in SF that were exposed for the purpose of tuning. You can try looking at the code diff of whatever tune you got it from to try to understand what was exposed.

tribal flame
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pls don't argue with someone if you don't know what is going on lol

tired barn