From d4737819cd7aea0e7744df9973dd5c1db228000e Mon Sep 17 00:00:00 2001
From: Tomasz Sobczyk <tomasz.sobczyk1997@gmail.com>
Date: Sun, 20 Sep 2020 10:39:21 +0200
Subject: [PATCH] Fix castling rights feature encoding.

---
 src/nnue/features/castling_right.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/nnue/features/castling_right.cpp b/src/nnue/features/castling_right.cpp
index 86fe06fe..ee2c88cf 100644
--- a/src/nnue/features/castling_right.cpp
+++ b/src/nnue/features/castling_right.cpp
@@ -27,7 +27,7 @@ namespace Eval {
         }
 
         for (Eval::NNUE::IndexType i = 0; i < kDimensions; ++i) {
-          if (relative_castling_rights & (i << 1)) {
+          if (relative_castling_rights & (1 << i)) {
             active->push_back(i);
           }
         }
@@ -55,8 +55,8 @@ namespace Eval {
         }
 
         for (Eval::NNUE::IndexType i = 0; i < kDimensions; ++i) {
-          if ((relative_previous_castling_rights & (i << 1)) &&
-            (relative_current_castling_rights & (i << 1)) == 0) {
+          if ((relative_previous_castling_rights & (1 << i)) &&
+            (relative_current_castling_rights & (1 << i)) == 0) {
             removed->push_back(i);
           }
         }