diff -r 619f07c95894 -r 27d02ccb0cef src/chess/king.c
--- a/src/chess/king.c	Tue Aug 25 18:59:18 2026 +0200
+++ b/src/chess/king.c	Tue Aug 25 19:42:15 2026 +0200
@@ -31,7 +31,7 @@
 #include "king.h"
 
 static bool king_castling_chkmoved(
-        const GameState *gamestate, Rank rank, File file) {
+        const GameState *gamestate, File file, Rank rank) {
 
     for (unsigned i = 0; i < gamestate->movecount; i++) {
         if (gamestate->moves[i].fromfile == file
@@ -55,9 +55,9 @@
             (move->tofile == fileidx('c') || move->tofile == fileidx('g'))) {
             
             return !king_castling_chkmoved(gamestate,
-                move->fromrank, move->fromfile) &&
-                !king_castling_chkmoved(gamestate, move->fromrank,
-                move->tofile == fileidx('c') ? 0 : 7);
+                    move->fromfile, move->fromrank) &&
+                !king_castling_chkmoved(gamestate,
+                    move->tofile == fileidx('c') ? 0 : 7, move->fromrank);
         } else {
             return false;
         }
@@ -82,14 +82,14 @@
             incheck = is_check_position(gamestate);
         }
         blocked |= incheck || gamestate->board[move->torank][midfile] ||
-            is_covered(gamestate, move->torank, midfile, op_color);
+            is_covered(gamestate, midfile, move->torank, op_color);
     }
     
     return blocked;
 }
 
 size_t king_moves(const GameState *gamestate,
-        Color c, Rank r, File f, Move *moves) {
+        Color c, File f, Rank r, Move *moves) {
 
     size_t count = 0;
     Piece king = mkpiece(KING, c);
@@ -113,7 +113,7 @@
             moves[count].fromfile = f;
             moves[count].torank = torank;
             moves[count].tofile = tofile;
-            moves[count].capture = piece_at(gamestate, torank, tofile) != 0;
+            moves[count].capture = piece_at(gamestate, tofile, torank) != 0;
             count++;
         }
     }