Old: 11 + G(1/3), bounded at 20 (G is the geometric distribution.) New: 10 + random2(T&D skill).
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1353 c06c8d41-db1a-0410-9941-cceddc491573
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