From 528cf0964d3a6174d5d3f88d5a17f2566d415203 Mon Sep 17 00:00:00 2001
From: Petr Baudis <pasky@ucw.cz>
Date: Fri, 24 Feb 2012 17:27:47 +0100
Subject: [PATCH] uct_search_result(): Verbose debug print in case pass is
 considered unsafe

Sometimes, Pachi mysteriously refuses to pass and it is not a reproducible bug; maybe this will help shed some light on it?
---
 uct/search.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/uct/search.c b/uct/search.c
index 265de27..2228516 100644
--- a/uct/search.c
+++ b/uct/search.c
@@ -478,15 +478,21 @@ uct_search_result(struct uct *u, struct board *b, enum stone color,
 	/* If the opponent just passed and we win counting, always
 	 * pass as well. For option stones_only, we pass only when there
 	 * there is nothing else to do, to show how to maximize score. */
-	if (b->moves > 1 && is_pass(b->last_move.coord) && b->rules != RULES_STONES_ONLY
-	    && uct_pass_is_safe(u, b, color, pass_all_alive)) {
-		if (UDEBUGL(0))
-			fprintf(stderr, "<Will rather pass, looks safe enough; score %f>\n",
-				board_official_score(b, NULL) / 2);
-		*best_coord = pass;
-		best = u->t->root->children; // pass is the first child
-		assert(is_pass(node_coord(best)));
-		return best;
+	if (b->moves > 1 && is_pass(b->last_move.coord) && b->rules != RULES_STONES_ONLY) {
+		if (uct_pass_is_safe(u, b, color, pass_all_alive)) {
+			if (UDEBUGL(0))
+				fprintf(stderr, "<Will rather pass, looks safe enough; score %f>\n",
+					board_official_score(b, NULL) / 2);
+			*best_coord = pass;
+			best = u->t->root->children; // pass is the first child
+			assert(is_pass(node_coord(best)));
+			return best;
+		} else {
+			if (UDEBUGL(3))
+				fprintf(stderr, "Refusing to pass, unsafe; pass_all_alive %d, ownermap #playouts %d, raw score %f\n",
+				        pass_all_alive, u->ownermap.playouts,
+					board_official_score(b, NULL) / 2);
+		}
 	}
 	
 	return best;
-- 
2.11.4.GIT