Hi Dmitri!

> Puzzle N1>   Is required to exchange W with some file REGister .

XORWF reg,W
XORWF reg,f
XORWF reg,W

> Puzzle N2>   Is required to load any file REGister with value = VALUE ,
> but W register haven't be changed after load is over .

MOVWF reg
XORLW VALUE
XORWF reg,f
XORWF reg,W

> P.S. I've find shortest solutions - Do you find it too ?

You tell me. Bye!
                                                              Andres