Why does stockfish randomise draw evaluations?

[konsolas]

In search.cpp:value_draw, Stockfish randomly adds or subtracts 1 to the draw score if the depth is > 3: https://github.com/official-stockfish/S ... pp#L88-L92

The comment is that this helps "avoid 3fold-blindness". What exactly does this mean? Are there any concrete examples of positions where this random component in draw evaluations notably changes the search result?

[zullil]

In search.cpp:value_draw, Stockfish randomly adds or subtracts 1 to the draw score if the depth is > 3: https://github.com/official-stockfish/S ... pp#L88-L92

The comment is that this helps "avoid 3fold-blindness". What exactly does this mean? Are there any concrete examples of positions where this random component in draw evaluations notably changes the search result?

https://github.com/official-stockfish/S ... 7fc6509886

[konsolas]

Thanks, that's very interesting.

[xr_a_y]

Thanks, that's very interesting.

Vincent, did you tried that?
This seems to be winning some elo for Minic.

[konsolas]

I'd love to, but I haven't worked on Topple much recently.