https://github.com/gcp/leela-zero/releases/tag/v0.16

Added support for lz-analyze and lz-genmove_analyze GTP extensions.
They provide real time information about the search and can be used by GUIs.
Added support for lz-setoption to change options without restarting.
Support setting max memory usage, visits, etc.
Implemented Winograd F(4x4, 3x3) for CPU and GPU, speeding up large networks.
Symmetrical positions in the opening are now recognized and sped up through mirroring/rotations.
Storing coefficients in fp16 format is automatically enabled if it is faster.
Support for fp16 compute. Large speedup on cards with fp16 compute support.
Improved scaling of MCTS search with large number of threads.
Added specific time management for self-play training games.
Bugfixes to SGF parsing.
Bugfixes to GTP compatibility.
AutoGTP: support compressed weights, removing the need to ungzip.
AutoGTP: use HTTPS.
Validation: support arbitrary GTP commands for each binary.
Training code now supports multi-GPU.
Bundled OpenBLAS is updated with support for new CPUs.
(Open)BLAS is no longer required for compiling.

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Has anyone observed whether this has an effect on opening play? IIRC there was a theory that the bot preference for 3-3 was partially due to the fact that it wins out over competing but identical approach moves.