From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Sat, 19 Dec 2020 06:49:40 +0000 (+0100)
Subject: File dependent horde imbalance
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=a9ebfc48bec555e8c8fa88ff8d3ad16317470d99;p=fairystockfish.git

File dependent horde imbalance

horde STC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 18445 W: 9313 L: 8946 D: 186
http://www.variantfishtest.org:6543/tests/view/5fd609b96e23db221d9e9520

horde LTC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 7637 W: 3892 L: 3680 D: 65
http://www.variantfishtest.org:6543/tests/view/5fd735576e23db221d9e952e
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index d039ec3..1dc3b65 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -1177,7 +1177,8 @@ namespace {
                 for (File f = FILE_A; f <= pos.max_file(); ++f)
                 {
                     l = m; m = r; r = popcount(pos.pieces(Us, PAWN) & shift<EAST>(file_bb(f)));
-                    score -= make_score(70, 70) * m / (1 + l * r);
+                    score -= make_score(80 - 10 * (edge_distance(f, pos.max_file()) % 2),
+                                        80 - 15 * (edge_distance(f, pos.max_file()) % 2)) * m / (1 + l * r);
                 }
             }
             else if (pos.count<PAWN>(Them) == pos.count<ALL_PIECES>(Them) && pos.pieces(Us, ROOK, QUEEN))