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bmdanielsson / marvin-chess

Marvin - An UCI/XBoard compatible chess engine
GNU General Public License v3.0
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pure NNUE evaluation ? #20

Closed tissatussa closed 2 weeks ago

tissatussa commented 1 month ago

on the Release page of v6.3.0 i see an 'Improvement' has changed : "Switch back to pure NNUE evaluation". but an UCI checkbox exists called 'UseNNUE' ? so, what does "pure NNUE evaluation" mean ?

besides that, my compiled v6.3.0 binary is under 2 Mb, just like your pre-compiled ones. this differs from v6.2.0, which has a (embedded) default NNUE file of 20 Mb, but v6.3.0 has no default EvalFile (value is empty), i guess it uses the res/eval.nnue of 1.5 Mb ?

and i wonder : when UseNNUE is True, is HCE not used at all or is the eval a combination of NNUE and HCE ?

bmdanielsson commented 1 month ago

Hi,

Before Marvin would switch to HCE under some conditions even when using NNUE. In 6.3.0 it will always use NNUE if NNUE is enabled. The "Use NNUE" checkbox means always use HCE or always use NNUE.

Yes, the file res/eval.nnue is used. It is included in the pre-compiled binaries. The network in 6.3.0 is a lot smaller wh9ich is why the binary size is smaller.

/Martin