From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Sun, 21 Jun 2020 12:04:28 +0000 (+0200)
Subject: Penalty for mandatory demotions
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=5f5b131b6df7453e8592a8e83ddfceaaf73762fd;p=fairystockfish.git

Penalty for mandatory demotions

kyotoshogi
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 776 W: 434 L: 323 D: 19
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 78ba6ab..af5b918 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -337,6 +337,9 @@ namespace {
                 score += make_score(PieceValue[MG][pos.promoted_piece_type(Pt)] - PieceValue[MG][Pt],
                                     PieceValue[EG][pos.promoted_piece_type(Pt)] - PieceValue[EG][Pt]) / 10;
         }
+        else if (pos.piece_demotion() && pos.unpromoted_piece_on(s))
+            score -= make_score(PieceValue[MG][Pt] - PieceValue[MG][pos.unpromoted_piece_on(s)],
+                                PieceValue[EG][Pt] - PieceValue[EG][pos.unpromoted_piece_on(s)]) / 4;
         else if (pos.captures_to_hand() && pos.unpromoted_piece_on(s))
             score += make_score(PieceValue[MG][Pt] - PieceValue[MG][pos.unpromoted_piece_on(s)],
                                 PieceValue[EG][Pt] - PieceValue[EG][pos.unpromoted_piece_on(s)]) / 8;