From fefa064cb959bd1b40dd5e3a64f4e05f2bcb63ea Mon Sep 17 00:00:00 2001
From: Calcitem <calcitem@outlook.com>
Date: Wed, 16 Jun 2021 00:38:35 +0800
Subject: [PATCH] depth: Limit 6th and 7th move depth to 15

Because if considerMobility is enabled, 6th and 7th
is too slow, so need to limit it. But cannot limit
less than 15, otherwise, c5 d5 b4 f4 d6 d2,
next move, white will place a lose point.

Now the performance only reduce 12%.
---
 src/mills.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mills.cpp b/src/mills.cpp
index 87f536f2..188d8970 100644
--- a/src/mills.cpp
+++ b/src/mills.cpp
@@ -456,8 +456,8 @@ Depth get_search_depth(const Position *pos)
     if (!gameOptions.getDeveloperMode()) {
         if (pos->phase == Phase::placing) {
             const Depth placingDepthTable[] = {
-                  +1, 1, +1,  1,     /* 0 ~ 3 */
-                  +3, 0, +0,  0,     /* 4 ~ 7 */
+                  +1,  1,  +1,  1,   /* 0 ~ 3 */
+                  +3, 15, +15,  0,   /* 4 ~ 7 */
                   +0, 0, +0,  0,     /* 8 ~ 11 */
                   +0, 0, +0,  0,     /* 12 ~ 15 */
                   +0, 0, +0,  0,     /* 16 ~ 19 */