From a7cf8e0c216ee68487f177b67ed93a79e425634b Mon Sep 17 00:00:00 2001
From: Karma Riuk <riukkarma@gmail.com>
Date: Sun, 2 Feb 2025 23:33:52 +0100
Subject: [PATCH] make_move now handles the setting of en passant targets

---
 cpp/src/board.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/cpp/src/board.cpp b/cpp/src/board.cpp
index ae3be04..a2d45da 100644
--- a/cpp/src/board.cpp
+++ b/cpp/src/board.cpp
@@ -188,6 +188,17 @@ Board Board::make_move(Move move) const {
     // -- Handle promotion
     if (move.promoting_to != 0)
         ret.squares[move.target_square] = move.promoting_to;
+
+    // -- Set en passant target if need
+    if ((squares[move.source_square] & 0b111) == Piece::Pawn
+        && std::abs(move.target_square - move.source_square) == 16) {
+        if (white_to_play)
+            ret.en_passant_target = move.target_square - 8;
+        else
+            ret.en_passant_target = move.target_square + 8;
+    } else {
+        ret.en_passant_target = -1;
+    }
     return ret;
 }