From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Sat, 24 Oct 2020 09:37:10 +0000 (+0200)
Subject: Tweak NMP depth for losing chess
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=e84c77ec50fa5412ab06188339aec9f959101ca2;p=fairystockfish.git

Tweak NMP depth for losing chess

giveaway STC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 1259 W: 523 L: 424 D: 312
http://www.variantfishtest.org:6543/tests/view/5f93432e6e23db221d9e9373

giveaway LTC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 1092 W: 430 L: 337 D: 325
http://www.variantfishtest.org:6543/tests/view/5f93603b6e23db221d9e9384
---

diff --git a/src/search.cpp b/src/search.cpp
index 41809c8..37b19c5 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -903,7 +903,7 @@ namespace {
         assert(eval - beta >= 0);
 
         // Null move dynamic reduction based on depth and value
-        Depth R = (982 - 150 * !pos.checking_permitted() + 85 * depth) / 256 + std::min(int(eval - beta) / 192, 3);
+        Depth R = (982 - 200 * pos.must_capture() - 150 * !pos.checking_permitted() + 85 * depth) / 256 + std::min(int(eval - beta) / 192, 3);
 
         ss->currentMove = MOVE_NULL;
         ss->continuationHistory = &thisThread->continuationHistory[0][0][NO_PIECE][0];