WinGammon@... wrote: > I have not been reading the list so don't know if this has been addressed or not. I don't have FB 5.6 so can't test it. If it works properly in 5.6, could someone give me a link to it. > > // these 2 tests should give the game answer but don't in FB 5.7 > // in FB 5.5 (and previous verisons) they give the same answer - which is correct. It's a bug with the not() function. Thanks for the report. '------------- include "ConsoleWindow" print not( _false or _zTrue ) // wrong print not( (_false or _zTrue) ) // extra parentheses are workaround '------------- The workaround is required wherever the argument to not() is an expression with binary operators (+ - * / and or xor). These are unaffected: not( x ) not( -x ) // unary operator Robert P.