1 files changed, 5 insertions, 0 deletions
diff --git a/src/board/fen.cpp b/src/board/fen.cpp
index 5f27e68..73201b8 100644
--- a/src/board/fen.cpp
+++ b/src/board/fen.cpp
@@ -32,6 +32,11 @@ static void updateBitboards(Game *g) {
   g->PieceBitboard = g->WhitePieceBitboard | g->BlackPieceBitboard;
 }
 static void SetPiece(int i, PieceType type, bool color, Game *g) {
+  if (i < 0 || i >= 64) {
+    std::println("Fatal: piece outside board");
+    assert(false && "Malformed board");
+    exit(1);
+  }
   g->pieces[i] = {.color = color, .type = type};
 }