Add "Minimal" option where only info from the final search depth is p…

…rinted (#760)

Done due to CuteChess being too slow to parse the normal output.

Bench: 24311257

src/search.c

@@ -39,6 +39,7 @@
 SearchLimits Limits = { .multiPV = 1 };
 atomic_bool ABORT_SIGNAL;
 atomic_bool SEARCH_STOPPED = true;
+atomic_bool Minimal = false;
 
 static int Reductions[2][32][32];
 
@@ -687,6 +688,7 @@ static void AspirationWindow(Thread *thread, Stack *ss) {
         // Give an update when failing high/low in longer searches
         if (   mainThread
             && Limits.multiPV == 1
+            && !Minimal
             && (score <= alpha || score >= beta)
             && TimeSince(Limits.start) > 3000)
             PrintThinking(thread, alpha, beta);
@@ -739,8 +741,9 @@ static void *IterativeDeepening(void *voidThread) {
         // Only the main thread concerns itself with the rest
         if (!mainThread) continue;
 
-        // Print thinking info
-        PrintThinking(thread, -INFINITE, INFINITE);
+        // Print search info
+        if (!Minimal)
+            PrintThinking(thread, -INFINITE, INFINITE);
 
         // Stop searching after finding a short enough mate
         if (MATE - abs(thread->rootMoves[0].score) <= 2 * abs(Limits.mate)) break;
@@ -763,6 +766,14 @@ static void *IterativeDeepening(void *voidThread) {
             history(i).key = 0;
     }
 
+    // Print final search info in minimal mode
+    if (mainThread && Minimal) {
+        // Fix the depth when the search is stopped due to reaching the depth limit
+        if (thread->depth > Limits.depth)
+            thread->depth--;
+        PrintThinking(thread, -INFINITE, INFINITE);
+    }
+
     return NULL;
 }
 

src/search.h

@@ -37,6 +37,7 @@ typedef struct {
 extern SearchLimits Limits;
 extern atomic_bool ABORT_SIGNAL;
 extern atomic_bool SEARCH_STOPPED;
+extern atomic_bool Minimal;
 
 
 void *SearchPosition(void *pos);

src/uci.c

@@ -115,6 +115,7 @@ static void SetOption(char *str) {
     else if (OptionNameIs("Threads"      )) InitThreads(IntValue);
     else if (OptionNameIs("SyzygyPath"   )) tb_init(optionValue);
     else if (OptionNameIs("MultiPV"      )) Limits.multiPV = IntValue;
+    else if (OptionNameIs("Minimal"      )) Minimal        = BooleanValue;
     else if (OptionNameIs("NoobBookLimit")) NoobLimit      = IntValue;
     else if (OptionNameIs("NoobBookMode" )) NoobBookSetMode(optionValue);
     else if (OptionNameIs("NoobBook"     )) NoobBook       = BooleanValue;
@@ -133,6 +134,7 @@ static void Info() {
     printf("option name Threads type spin default %d min %d max %d\n", 1, 1, 2048);
     printf("option name SyzygyPath type string default <empty>\n");
     printf("option name MultiPV type spin default 1 min 1 max %d\n", MULTI_PV_MAX);
+    printf("option name Minimal type check default false\n");
     printf("option name UCI_Chess960 type check default false\n");
     printf("option name NoobBook type check default false\n");
     printf("option name NoobBookMode type string default <best>\n");