From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Thu, 5 Aug 2021 14:42:54 +0000 (+0200)
Subject: Prevent division by zero in extinction bonus
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=42c9b523222f1e2319fba7e5ef60674af4c97b79;p=fairystockfish.git

Prevent division by zero in extinction bonus

Fixes #340.
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 0e0dd46..b59df81 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -1230,7 +1230,7 @@ namespace {
             else if (pos.extinction_value() == VALUE_MATE)
             {
                 // Losing chess variant bonus
-                score += make_score(pos.non_pawn_material(Us), pos.non_pawn_material(Us)) / pos.count<ALL_PIECES>(Us);
+                score += make_score(pos.non_pawn_material(Us), pos.non_pawn_material(Us)) / std::max(pos.count<ALL_PIECES>(Us), 1);
             }
             else if (pos.count<PAWN>(Us) == pos.count<ALL_PIECES>(Us))
             {