Release 3.7b

Sources/Bitboard/src/bagaturchess/bitboard/impl1/internal/MoveGenerator.java

@@ -68,6 +68,8 @@ public final class MoveGenerator {
 	private final ContinuationHistory[] BF_ContinuationHistory 	= new ContinuationHistory[2];
 
 
+	private long counter_sorting;
+
 	private Random randomizer = new Random();
 
 	private int root_search_first_move_index;
@@ -695,12 +697,14 @@ public void sort() {
 		final int start_index = nextToMove[currentPly];
 		final int end_index = nextToGenerate[currentPly] - 1;
 
-		//Randomize non attacks only
-		if (MoveUtil.isQuiet(moves[start_index])) {
+		//Randomize each 3 sortings
+		//In order to increase the effect of nondeterminism, ensure first ordering is randomized.
+		if (counter_sorting == 0 || counter_sorting % 5 == 0) {
 
 			randomize(moveScores, moves, start_index, end_index);
 		}
 
+
 		for (int i = start_index, j = i; i < end_index; j = ++i) {
 			final long score = moveScores[i + 1];
 			final int move = moves[i + 1];
@@ -740,6 +744,9 @@ public void sort() {
 				moves[start_index] 							= move;
 			}
 		}
+
+
+		counter_sorting++;
 	}
 
 

Sources/Resources/doc/engine/txt/release_notes_BagaturEngine.txt

@@ -1,3 +1,6 @@
+Version 3.7b (25 March 2023)
+ * Less aggressive randomization of move order before sorting.
+
 Version 3.7a (18 February 2023)
  * Change the condition for randomizing the non-attacking moves. Now they are always randomized.
 

Sources/UCI/src/bagaturchess/uci/impl/Protocol.java

@@ -30,7 +30,7 @@
 public class Protocol {
 
 
-	public static final String COMMAND_TO_GUI_ID_VERSION_STR = "3.7a";
+	public static final String COMMAND_TO_GUI_ID_VERSION_STR = "3.7b";
 
 	public static final String COMMAND_TO_ENGINE_UCI_STR = "uci";
 	public static final String COMMAND_TO_ENGINE_ISREADY_STR = "isready";