We don't need that !
We can infere from starting fen string if we are in
a Chess960 game or not. And note that this is a per-position
property, not an application wide one.
A nice trick is to use a custom manipulator (that is an
enum actually) to keep using the handy operator<<() on the
move when sending to std::cout, yes, I have indulged a
bit here ;-)
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Plus a bunch of other minor optimizations.
With this power pack we have an increase
of a whopping 1.4% :-)
...and it took 3 good hours of profiling + hacking to get it out !
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Where they belong.
Note that array PieceValueMidgame[] and PieceValueEndgame[]
are now declared extern in the header and moved in piece.cpp
so to avoid allocate the array each time the header is
included !
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Doing the conversion the compiler is now able to
spot two possible ambiguity calls that now we can
easily fix.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
There is a functional change because we now skip
more moves and because do_move() / undo_move() is
well known to be not reversible we end up with a
change in node count, although there is actually
no change but a bit speed up.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
To be uniform across the sources. As a nice side effect
I quickly spotted a couple of needed renames:
captured_piece() -> captured_piece_type()
st->capture -> st->capturedType
Proposed by Ralph and done with QtCreator
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Broken by recent patch. Also better document what's
happening there.
Verified to restore original behaviour.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Less invasive then previous patches, but still a good
enhancement.
Also some indulge on STL algorithms :-)
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Complete rewrite the function and extend compatibility
also to X-FEN notation for Chess960.
We are now able to read standard FEN, Shredder-FEN and X-FEN.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Using multiple threads and good opening book is
much better and more reliable source of randomness than
spoiling psqt-tables
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This code is platform specific and has nothing to
do with TT class, so move to misc.cpp
This patch is a prerequisite to use extend prefetch use
also to other hash tables apart from Transposition Table.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Search ply and game ply are rwo different things !
Revert bogus commit.
No functional change on bench, but it changes in real games
when engine sends all the moves up to current one.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This is the best place because when we split we do a
copy of the position and also threadID, once set in a
given position, never changes anymore.
Forbid use of Position's default and copy c'tor to avoid
nasty bugs in case a position is created without explicitly
setting the threadID.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
And avoid a redundant one passed as argument in
search calls.
Also renamed gamePly in ply to better clarify this
is used as search ply and is set to zero at the
beginning of the search.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
And remove from main do_move() flow. Just a small speedup
because we avoid two branches in the common case.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
The index at 0 was reserved for no-pieces
information. But we don't need that.
This is a prerequisite for next patch.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
They are both 64 bits unsigned integer, but it
is correct to use the proper type.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Array castleRightsMask[] is not static because it can
be different for different positions, so let it be
a Position member data. This allows to remove tricky
hacks to take in account that although it was defined
static it could change.
Theoretically now copying a position is a bit slower because
we need to copy also an array of 64 integers, but because in
split() we don't copy the position anymore, but just keep the
pointer, the added burden is not mesurable even in MP case.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It will be used by future patches and also rearranges some
half cooked code that mistakenly ended up in master in the
past.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Bug spotted by Jouni Uski and fix suggested by Pablo Vazquez
Also add note that we are not always handling fifty move rule correctly
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
In move_to_san() we create by copy a new position just
to detect if move gives check. This could be very costly in
line_to_san() that calls move_to_san() for every move, so
create the position only once and pass a reference to move_to_san()
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Renamed a bit the functions to be more clear what
we actually are doing when we craete a Position object
and explained how StateInfo works.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Also removed some trailing whitespaces and aligned
indentation to current standard.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
The init_eval() function corrupted the static array castleRightsMask[]
in the Position class, resulting in instant crashes in most Chess960
games. Fixed by repairing the damage directly after the function is
called. Also modified the Position::to_fen() function to display
castle rights correctly for Chess960 positions, and added sanity checks
for uncastled rook files in Position::is_ok().
According to standard en-passant is recorded in fen string regardless
of whether there is a pawn in position to make an en passant capture.
Instead internally we set ep square only if the pawn can be captured.
So teach from_fen() to correctly handle this difference.
Bug reported and fixed by Justin Blanchard.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
The most interesting thing is a bit of rewrite
and semplification in connected_moves()
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
When false (common case) we avoid to update checkers
bitboard that although not so costly slows down a bit
this very hot and critical path.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
