This is the inverse of the chance of hide drops, and considering that corpse drops are required first and don't always occur, the actual probability is less.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8194 c06c8d41-db1a-0410-9941-cceddc491573
BDTWKBUEAFESWE74IUU7IFK2RDZKSIBSVRZQXZLPX2RRN65TRIUQC
EMPCLM5IS2DKVNICFEDGSA36EDE4ZEAXNPEOFUKA6W57B3HFHQVAC
5ZK5LRURXTESPILVQXBX2QQC2U55WZDFX75TSBUF2XC4JDJ5D33AC
2GUJEAQN5CVJOKMEZANI6QQ6JFJZGCS6TDKHTVP4NZFXVNSYZWEAC
GASNVWKEMRKFEMHIQPMD5XRJ5PVDVSSHCFHV6HWTR6PRKRCUP4EQC
K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
RQR4PTMGQLTRWLYRU3KXIIDGND7FBORESJWMWFVD3WYU5SISZXAAC
LCGR52GGFWII4WW7GVUM72PJ2LPVYRUK636334KYRX2TYJSKS2QQC