Document why Book is defined static

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 0e3ba85c82ae5bf421ce7192d8e03a621d636979..1f848183481a573cf59710f2993a1c4fb890a1f2 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -363,7 +363,7 @@ int64_t perft(Position& pos, Depth depth) {
 
 bool think(Position& pos, const SearchLimits& limits, Move searchMoves[]) {
 
-  static Book book;
+  static Book book; // Define static to initialize the PRNG only once
 
   // Initialize global search-related variables
   StopOnPonderhit = StopRequest = QuitRequest = AspirationFailLow = false;
@@ -1549,8 +1549,8 @@ split_point_start: // At split points actual search starts from here
     Piece p1, p2;
     Square ksq;
 
-    assert(m1 && move_is_ok(m1));
-    assert(m2 && move_is_ok(m2));
+    assert(move_is_ok(m1));
+    assert(move_is_ok(m2));
 
     // Case 1: The moving piece is the same in both moves
     f2 = move_from(m2);
@@ -1626,7 +1626,7 @@ split_point_start: // At split points actual search starts from here
   bool connected_threat(const Position& pos, Move m, Move threat) {
 
     assert(move_is_ok(m));
-    assert(threat && move_is_ok(threat));
+    assert(move_is_ok(threat));
     assert(!pos.move_is_capture_or_promotion(m));
     assert(!pos.move_is_passed_pawn_push(m));