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Simplify aspiration window code

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Here the main difference is that now we center
aspiration window on last returned score. This allows
to simplify handling of mate scores.

We have done a reversed SPRT tests, where we wanted to
verify if master is stronger than this patch.

Long TC: master vs this patch (reverse test)
LLR: -2.95 (-2.94,2.94)
Total: 37992 W: 7012 L: 6920 D: 24060

bench: 4507288
This commit is contained in:
Marco Costalba 2013-07-03 08:54:44 +02:00
commit 6fbe027da0
2 changed files with 7 additions and 2 deletions
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6
src/Makefile
View file

@ -231,7 +231,7 @@ ifeq ($(COMP),clang)
endif
### 3.2 General compiler settings
CXXFLAGS = -g -Wall -Wcast-qual -fno-exceptions -fno-rtti $(EXTRACXXFLAGS)
CXXFLAGS = -Wall -Wcast-qual -fno-exceptions -fno-rtti $(EXTRACXXFLAGS)
ifeq ($(comp),gcc)
CXXFLAGS += -ansi -pedantic -Wno-long-long -Wextra -Wshadow
@ -275,6 +275,8 @@ endif
### 3.4 Debugging
ifeq ($(debug),no)
CXXFLAGS += -DNDEBUG
else
CXXFLAGS += -g
endif
### 3.5 Optimization
@ -354,6 +356,7 @@ endif
### needs access to the optimization flags.
ifeq ($(comp),gcc)
ifeq ($(optimize),yes)
ifeq ($(debug),no)
GCC_MAJOR := `$(CXX) -dumpversion | cut -f1 -d.`
GCC_MINOR := `$(CXX) -dumpversion | cut -f2 -d.`
ifeq (1,$(shell expr \( $(GCC_MAJOR) \> 4 \) \| \( $(GCC_MAJOR) \= 4 \& $(GCC_MINOR) \>= 5 \)))
@ -361,6 +364,7 @@ ifeq ($(comp),gcc)
LDFLAGS += $(CXXFLAGS)
endif
endif
endif
endif
### ==========================================================================

3
src/evaluate.cpp
View file

@ -821,7 +821,8 @@ Value do_evaluate(const Position& pos, Value& margin) {
// If there is an enemy rook or queen attacking the pawn from behind,
// add all X-ray attacks by the rook or queen. Otherwise consider only
// the squares in the pawn's path attacked or occupied by the enemy.
if (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN) & pos.attacks_from<ROOK>(s))
if ( (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN)) // Unlikely
&& (forward_bb(Them, s) & pos.pieces(Them, ROOK, QUEEN) & pos.attacks_from<ROOK>(s)))
unsafeSquares = squaresToQueen;
else
unsafeSquares = squaresToQueen & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them));