From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Wed, 16 Dec 2020 17:48:29 +0000 (+0100)
Subject: Simplify away shogi pawn structure evaluation
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=6700dce60b8ebbceaed147402565e7c742212b84;p=fairystockfish.git

Simplify away shogi pawn structure evaluation

shogi STC
LLR: 2.98 (-2.94,2.94) [-10.00,5.00]
Total: 1737 W: 890 L: 834 D: 13
http://www.variantfishtest.org:6543/tests/view/5fd93a846e23db221d9e9540

shogi LTC
LLR: 2.96 (-2.94,2.94) [-10.00,5.00]
Total: 3348 W: 1686 L: 1642 D: 20
http://www.variantfishtest.org:6543/tests/view/5fd9b46f6e23db221d9e9552
---

diff --git a/src/pawns.cpp b/src/pawns.cpp
index 137f2e0..fef84da 100644
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -191,22 +191,6 @@ namespace {
     if (pos.count<ALL_PIECES>(Us) == pos.count<PAWN>(Us))
         score = score * 2;
 
-    const Square* pl_shogi = pos.squares<SHOGI_PAWN>(Us);
-
-    ourPawns   = pos.pieces(Us,   SHOGI_PAWN);
-    theirPawns = pos.pieces(Them, SHOGI_PAWN);
-
-    // Loop through all shogi pawns of the current color and score each one
-    while ((s = *pl_shogi++) != SQ_NONE)
-    {
-        assert(pos.piece_on(s) == make_piece(Us, SHOGI_PAWN));
-
-        neighbours = ourPawns & adjacent_files_bb(s);
-
-        if (!neighbours)
-            score -= Isolated / 2;
-    }
-
     return score;
   }