From 62c77ef1480c619aac632e42c43c6857393707c3 Mon Sep 17 00:00:00 2001
From: winapiadmin <138602885+winapiadmin@users.noreply.github.com>
Date: Sat, 28 Mar 2026 14:48:52 +0000
Subject: [PATCH 1/2] fast dirty compare (without casting types)

---
 position.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/position.h b/position.h
index 4fd1fc3..59741f8 100644
--- a/position.h
+++ b/position.h
@@ -94,8 +94,8 @@ template <typename PieceC = EnginePiece, typename = std::enable_if_t<is_piece_en
     bool _chess960{};
 
   public:
-    static inline const std::string START_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
-    static inline const std::string START_CHESS960_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w HAha - 0 1";
+    static inline auto START_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+    static inline auto START_CHESS960_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w HAha - 0 1";
     // Legal move generation functions
     template <MoveGenType type = MoveGenType::ALL, Color c> void legals(Movelist &out) const {
 

From dee9ea4162bb0abbcce4d7daadcaebabc35ecf7d Mon Sep 17 00:00:00 2001
From: winapiadmin <138602885+winapiadmin@users.noreply.github.com>
Date: Sat, 28 Mar 2026 14:54:20 +0000
Subject: [PATCH 2/2] constexpr

---
 position.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/position.h b/position.h
index 59741f8..17dad14 100644
--- a/position.h
+++ b/position.h
@@ -94,8 +94,8 @@ template <typename PieceC = EnginePiece, typename = std::enable_if_t<is_piece_en
     bool _chess960{};
 
   public:
-    static inline auto START_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
-    static inline auto START_CHESS960_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w HAha - 0 1";
+    static inline constexpr auto START_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+    static inline constexpr auto START_CHESS960_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w HAha - 0 1";
     // Legal move generation functions
     template <MoveGenType type = MoveGenType::ALL, Color c> void legals(Movelist &out) const {