Add support for very large boards and guard Omega variant

setup.py

@@ -12,7 +12,7 @@
 else:
     args = ["-std=c++17", "-flto", "-Wno-date-time"]
 
-args.extend(["-DLARGEBOARDS", "-DALLVARS", "-DPRECOMPUTED_MAGICS", "-DNNUE_EMBEDDING_OFF"])
+args.extend(["-DVERY_LARGE_BOARDS", "-DALLVARS", "-DNNUE_EMBEDDING_OFF"])
 
 if "64bit" in platform.architecture():
     args.append("-DIS_64BIT")

src/Makefile

@@ -95,6 +95,7 @@ endif
 
 ### 2.1. General and architecture defaults
 largeboards = no
+verylargeboards = no
 all = no
 precomputedmagics = yes
 nnue = no
@@ -336,11 +337,15 @@ CXXFLAGS += -Wno-profile-instr-out-of-date
 
 # Compile version with support for large board variants
 # Use precomputed magics by default if pext is not available
+ifneq ($(verylargeboards),no)
+        largeboards = no
+        CXXFLAGS += -DVERY_LARGE_BOARDS
+endif
 ifneq ($(largeboards),no)
-	CXXFLAGS += -DLARGEBOARDS
-	ifeq ($(precomputedmagics),yes)
-		CXXFLAGS += -DPRECOMPUTED_MAGICS
-	endif
+        CXXFLAGS += -DLARGEBOARDS
+        ifeq ($(precomputedmagics),yes)
+                CXXFLAGS += -DPRECOMPUTED_MAGICS
+        endif
 endif
 
 # Embed and enable NNUE
@@ -361,9 +366,11 @@ ifeq ($(COMP),gcc)
 	comp=gcc
 	CXX=g++
 	CXXFLAGS += -Wextra -Wshadow
-	ifeq ($(largeboards),no)
-		CXXFLAGS += -pedantic
-	endif
+        ifeq ($(largeboards),no)
+                ifeq ($(verylargeboards),no)
+                        CXXFLAGS += -pedantic
+                endif
+        endif
 
 	ifeq ($(arch),$(filter $(arch),armv7 armv8))
 		ifeq ($(OS),Android)
@@ -779,6 +786,10 @@ else
 	@echo ""
 	@echo "make build ARCH=x86-64 COMP=gcc largeboards=yes"
 	@echo ""
+	@echo "Version for very large boards: "
+	@echo ""
+	@echo "make build ARCH=x86-64 COMP=gcc verylargeboards=yes"
+	@echo ""
 	@echo "Include all variants (adds Game of the Amazons): "
 	@echo ""
 	@echo "make build ARCH=x86-64 largeboards=yes all=yes"
@@ -900,9 +911,10 @@ config-sanity: $(load_net)
 	@echo "vnni512: '$(vnni512)'"
 	@echo "neon: '$(neon)'"
 	@echo ""
-	@echo "Fairy-Stockfish specific:"
-	@echo "largeboards: '$(largeboards)'"
-	@echo "all: '$(all)'"
+        @echo "Fairy-Stockfish specific:"
+        @echo "largeboards: '$(largeboards)'"
+        @echo "verylargeboards: '$(verylargeboards)'"
+        @echo "all: '$(all)'"
 	@echo "precomputedmagics: '$(precomputedmagics)'"
 	@echo "nnue: '$(nnue)'"
 	@echo ""

src/bitbase.cpp

@@ -78,7 +78,7 @@ bool Bitbases::probe(Square wksq, Square wpsq, Square bksq, Color stm) {
 
 void Bitbases::init() {
 
-#ifdef LARGEBOARDS
+#if defined(LARGEBOARDS) || defined(VERY_LARGE_BOARDS)
     // Bitbases are not working for large-board version
     return;
 #endif