From 3975fc9c0dc1f896ae20339bb14c83572971f9a6 Mon Sep 17 00:00:00 2001
From: JWmer <26392242+NightlyKing@users.noreply.github.com>
Date: Fri, 20 Nov 2020 15:49:02 +0100
Subject: [PATCH] Update half_relative_ka.cpp

---
 src/nnue/features/half_relative_ka.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/nnue/features/half_relative_ka.cpp b/src/nnue/features/half_relative_ka.cpp
index ba3edbcf..d2ad31e6 100644
--- a/src/nnue/features/half_relative_ka.cpp
+++ b/src/nnue/features/half_relative_ka.cpp
@@ -4,9 +4,13 @@
 //Definition of input features HalfRelativeKA of NNUE evaluation function
 namespace Eval::NNUE::Features {
 
-    // Orient a square according to perspective (flip rank for black)
+    // Orient a square according to perspective (rotate the board 180° for black)
+    // Important note for "halfka": this arch was designed with "flip" in mind 
+    // although it still is untested which approach is better.
+    // this has to stay until we find a better arch that works with "flip".
+    // allows us to use current master net for gensfen (primarily needed for higher quality data)
     inline Square orient(Color perspective, Square s) {
-        return Square(int(s) ^ (bool(perspective) * SQ_A8));
+        return Square(int(s) ^ (bool(perspective) * 63));
     }
 
     // Find the index of the feature quantity from the ball position and PieceSquare