From 4eb36e67eca586a662298bfe8cc5392fbfa698e0 Mon Sep 17 00:00:00 2001
From: Adam <adammegarules1@gmail.com>
Date: Sat, 15 Aug 2026 17:01:54 +0200
Subject: implementing memory optimazied move using uint16_t instead of a four
 integers and one byte

---
 src/uci.cpp | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

(limited to 'src/uci.cpp')

diff --git a/src/uci.cpp b/src/uci.cpp
index 0266aa6..92c7072 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -22,7 +22,7 @@
 static const std::string starting_fen =
     "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
 
-Move UciToMove(const std::string &uci) {
+uint16_t UciToMove(const std::string &uci) {
   Position from;
   Position to;
   PieceType promotion = NONEPIECE;
@@ -32,6 +32,7 @@ Move UciToMove(const std::string &uci) {
     std::cout << "expected valid uci string\n";
     exit(1);
   }
+  // TODO: validate before using
   from.file = static_cast<uint8_t>(uci[0] - 'a');
   from.rank = static_cast<uint8_t>(uci[1] - '1');
 
@@ -58,7 +59,8 @@ Move UciToMove(const std::string &uci) {
     }
   }
 
-  return {.From = from, .To = to, .promotion = promotion};
+  return CreateMove(static_cast<uint8_t>(PositionToIndex(from)),
+                    static_cast<uint8_t>(PositionToIndex(to)), promotion);
 }
 
 Game initBoard(
@@ -207,13 +209,21 @@ static void GoCommand(Game *game, std::string &cmd) {
       .wncr = wncr,
       .bncr = bncr,
   };
-  Move best = GetBestMove(game, depth, options);
+  uint16_t best = GetBestMove(game, depth, options);
+
+  Piece piece = game->pieces[getFromValueFromMove(best)];
+
+  Position from = IndexToPosition(getFromValueFromMove(best));
+  Position to = IndexToPosition(getToValueFromMove(best));
+  PieceType promotion = getPromotionTypeFromMove(best);
 
   std::cout << "bestmove ";
-  std::cout << static_cast<char>(best.From.file + 'a') << 1 + best.From.rank
-            << static_cast<char>(best.To.file + 'a') << 1 + best.To.rank;
+  std::cout << static_cast<char>(from.file + 'a') << 1 + from.rank
+            << static_cast<char>(to.file + 'a') << 1 + to.rank;
 
-  printPromotionLetter(best.promotion);
+  if ((to.rank == 0 || to.rank == 7) && piece.type == PAWN) {
+    printPromotionLetter(promotion);
+  }
 
   std::cout << "\n";
   std::cout.flush();
@@ -252,7 +262,7 @@ static void positionCommnad(Game *game, std::string &cmd) {
   }
 
   while (ss >> token) {
-    Move move = UciToMove(token);
+    uint16_t move = UciToMove(token);
 
     MakeMove(move, game);
   }
-- 
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