These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.99 s (backtrack: 0/20).

[ebuild  N     ] dev-cpp/gtest-1.17.0:0/1.17.0::gentoo  USE="(-abseil) -doc -examples -test" 865 KiB
[ebuild  N     ] games-board/lc0-0.31.2::gentoo  USE="-blas -dnnl -ispc (-onnx) -opencl -test" 681 KiB

Total: 2 packages (2 new), Size of downloads: 1546 KiB