Keep the isChess960 flag inside Position so that is
copied with the Position, but esplicitly highlight the
fact that a FEN string has not enough information to detect
Chess960 in general case. To do this add a boolean argument
isChess960 to from_fen() function so to self document this
shortcoming of FEN notation.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It seems HP's ANSI C++ doesn't understand very well
standard function-style cast.
Reported by Richard Lloyd.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
And set them as default.
Introduce compile switch OLD_LOCKS to allow to fallback on
compatible locks supported by Windows XP and older versions.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Introduced by me in before 1.9 and found by Tord that says:
The 'isChess960' slot in the 'Position' class is currently
set depending on the initial files of the rooks, and not on the value
of the UCI_Chess960 parameter. This is incorrect, as there are lots of
Chess960 positions where the rooks start on the usual files. As a
consequence (unless I am missing something), Stockfish will occasionally
output castling moves as e1g1/e1c1 rather than the correct e1h1/e1a1 format
in Chess960 games. It is possible that some or even most GUIs are robust
enough to accept both notations, but I wouldn't bet on it. And in any case,
Stockfish's behavior clearly violates the protocol.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This time I have removed the function alltogether !
Sorry to work above a patch of UncombedCoconut (Justin Blanchard)
but I couldn't resist ;-)
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
When we log best and ponder move to a file before to
return from think we change the position. If position is
then not resended by GUI, as for manual user input we got
an error:
justinb@malibu:~$ stockfish
Stockfish 2.0 JA 64bit by Tord Romstad, Marco Costalba, Joona Kiiski
setoption name Use Search Log value true
go depth 1
info depth 1
info depth 1 seldepth 1 multipv 1 score cp 72 time 59 nodes 20 nps 338 pv g1f3
info depth 2
info depth 2 seldepth 2 multipv 1 score cp 12 time 59 nodes 44 nps 745 pv g1f3 g8f6
info nodes 84 nps 1423 time 59
bestmove g1f3 ponder g8f6
go depth 1
info depth 1 score mate 0
info nodes 87 nps 0 time 0
bestmove (none) ponder (none)
Bug spotted and fixed by UncombedCoconut.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
And set "Use Sleeping Threads" to true because it keeps
much more responsive and cool my QUAD during tests :-)
It will be reverted back before to release that's the
reason to bundle it here.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Always same siganture: 7224363
Hopefully some more bug fixed and restored
compatibility with WIndows XP.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
They are not compatible with Windows XP
Revert to old CRITICAL_SECTION locks and events.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Second parameter of insertion_sort() is a pointer to the
element _after_ the last of the list, e.g. end() when sorting
all items.
If we want to sort say the first 2 moves we should write:
sort_multipv(2);
So, becuase in root moves loop move counter 'i' starts
from 0, we need to pass:
sort_multipv(i+1);
To sort up to move 'i' included.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It doesn't seem to have any meaning.
Also add a FIXME on the MaxNodes condition that now is broken
in SMP case due to known issue with pos.nodes_searched()
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
We were not quitting the engine after a "quit" command
while still in the book and pondering.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
If flag StopOnPonderhit is set it means that we UseTimeManagement
and also we are at Iteration >= 3.
So we can safely simplify the formula.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It is called only from one place, so move code there.
Add a bit of renaming and documentation while at there.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
And set "Use Sleeping Threads" to true because it keeps
much more responsive and cool my QUAD during tests :-)
It will be reverted back before to release that's the
reason to bundle it here.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It was introduced by patch 66d16592 of 22/3/2009 merging
from Glarurung iPhone.
Tord says:
That change is only found in the Glaurung iPhone app, and not
in the latest Glaurung UCI source code. I don't remember why
this was added (and the iPhone app, unlike the UCI engine,
was never version controlled), but it was almost certainly
because it was somehow needed in the communication between
the engine and the iPhone GUI, and that it was never meant to be
included in the UCI engine. My guess is that it has something to
do with castling moves being entered as e1-g1 in the GUI, but
represented as e1-h1 in the chess engine.
Removing it in Stockfish should be completely safe, and won't harm
the iPhone version. Initially the iPhone GUI called functions in the
chess engine for checking for legality of moves, writing the move
list in SAN format, and various other tasks, but this is no longer
the case in the current version.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This is the "selective search depth in plies" and we set
equal to PV line length.
Tested that works under FritzGUI.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It seems a more appropiate place (IMHO) and helps to clarify
that idle_loop() should return a move, not a score.
Fix also handling of stalemate positions (we were not
sending any score) and we don't need to wait on "ponderhit",
this is done when returning in think().
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
We have a small functionality change in case we have a
fail-high so that both rml[].pv and pv[] are updated, but if,
after researching, we have a fail-low then rml score is updated
again but pv[] remains the same and coming back from search we
used a PV line that has failed-low (after having failed-high).
With this patch we always use the 'correct' PV line, i.e. the
line with highest score at the end of the whole search.
Retire also redundant RootMove's 'move' member and directly
use pv[0] instead.
Define symbol '<' to mean 'minor of', as it should be. Its meaning
was reversed to be used with std::sort() that sorts in ascending order
while we want a descending order.
But now that we use our own sorting code we don't need this
trick anymore.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
When a reference breaks things !
Here we take a reference (that is a pointer) to an
entry in a vector that changes below us --> BOOM !
References are essential but should be considered with
care in C++ because could lead to nasty surprises.
Restored functionality.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Instead of a default member by member copy use set_pv()
to copy the useful part of pv[] array and skip the remaining.
This greatly speeds up sorting of root move list !
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It is redundant being a move list ;-)
Also better document the two scores used by root list.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Function ray_bb() was used just in one endgame where can
be used squares_in_front_of() instead.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Remark 1418: external function definition with no prior declaration
and
Remark 1419: external declaration in primary source file
Can be safely ignored because are pure idiocy.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Namely we use only two types of depth in TT:
DEPTH_QS_CHECKS or DEPTH_QS_NO_CHECKS.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
And rename move_from/to_string() in a more specific
move_from/to_uci() that is a simple coordinate notation.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Use one sleep lock per thread insted of a single one shared.
Also renamed WaitLock in SleepLock.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
By mean of an an UCI option it is possible let the available
threads to sleep, this should help with Hyper Threading although
is not the best solution when number of threads equals number
of available cores.
Option is disabled by default.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
No speed regression and no functional change.
After 7826 games Mod- Orig:
1188 - 1230 - 5408 ELO -1 (+- 3.1)
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Non-PV LMR is left unchanged.
After 8819 games
Mod- Orig: 1442 - 1343 - 6034 ELO +3 (+- 2.9) LOS 86%
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Bug introduced in 9dcc2aad98
We can be asked to open a non-exsistent file,
in this case we should gracefully handle the
case and silently return instead of exiting.
Bug discovered and bisected down by Joona.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
When MultiPV > 1, always take bestmove from the RootMoveList
(and don't bother with a ponder move). Without that the bestmove
is most probably incorrect.
Patch from Peter Petrov.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
When we store this value in TT we cut this to 9 bits,
so we need a smaller variable otherwise comparisons
like:
replace->generation() == generation
Are always false if generation is bigger then the maximum
TT storable value.
This fixes a very nasty and difficult to spot bug (2 weeks for
regression hunting).
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
It is a redundant boiler plate, just call initialization and
resource release directly from main()
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Correctly handle uci option names in a case insensitive way.
Alos fix some indentation while there.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Was introduced by 403db5a6e9
on 1/12/2009 to correctly handle "loose on time"
LSN filtering functionality, but is now unused.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This L1/L2 optimization has an incredible +4.7% speedup
in perft test where this function is the most time consumer.
Verified a speed up also in normal bench, although smaller.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
UCI protocol uses "true" and "false" for check and button types,
so store that values instead of "1" and "0", this simplifies a
bit the code.
Also a bit strictier option's type checking in debug mode.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This patch greatly cleanups generation of pawn moves but
we change the order in which moves are generated so there is
a change in functionality, but not in perft.
The only real functionality change is that now when type == CHECK
we generate knight underpromotion captures only if give check and
not always as before.
Perft is 2% faster and fully verified.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Now stockfish bench' defaults to
stockfish bench 128 1 12 default depth
that is the most used line (at least by me)
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Let to sleep even split point master, it will be waken
up by its slaves when they return from the search.
This time let it be enabled by an UCI option, so
people is free to test it on their Hyper Thread box.
Option is disabled by default.
No functional change.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Search at fixed depth with one thread must be
reproducible so remove randomess from time().
Also better license description.
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Marco Costalba