/usr/share/lyx/examples/iecc12.fen is in lyx-common 2.1.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
r2qk2r/1b2nppp/p1pppb2/8/4PBQ1/2N3P1/PPP2PBP/3R1RK1 b kq - 0 12