[5.06] book moves not found after "force" and "go"

[Martin Mačok]

Hi, 
when commands "force" and then "go" are used, gnuchess 5.06 (current
CVS) can't find position in book, 5.05 works OK.
This affects "xboard -mg" tournaments between chess engines for
example...

See:

GNU Chess 5.05

White (1) : force
White (1) : e2e4
[snip]
Black (1) : black
Black (1) : go
Thinking...
Looking for opening book in book.dat...
Read opening book (book.dat)...
Loading book from book.dat.
36736 hash collisions...  Opening database: 172456 book positions.
 In this position, there are 11 book moves:

 ... and

GNU Chess 5.06

White (1) : force
White (1) : e2e4
1. e2e4
[snip]
Black (1) : black
Black (1) : go
Thinking...
Looking for opening book in book.dat...
Read opening book (book.dat)...
Loading book from book.dat.
36736 hash collisions...  Opening database: 172456 book positions.
 In this position, there is no book move.

-- 
         Martin Mačok                 http://underground.cz/
   address@hidden        http://Xtrmntr.org/ORBman/