diff --git a/src/move-gen.c b/src/move-gen.c
index fa3e451..9c53b9a 100644
--- a/src/move-gen.c
+++ b/src/move-gen.c
@@ -157,8 +157,8 @@ movelist_t *pos_all_legal(const pos_t *pos, movelist_t *dest)
  *  - castling, if king passes an enemy-controlled square (not final square).
  * When immediately known, a few move flags are also applied in these cases:
  *  - castling: M_CASTLE_{K,Q}
- *  - pawn capture (incl. en-passant): M_CAPTURE
- *                         en-passant: M_EN_PASSANT
+ *  - pawn capture (excl. en-passant): M_CAPTURE
+ *  - en-passant: M_EN_PASSANT
  *  - pawn double push: M_DPUSH
  *  - promotion: M_PROMOTION
  *  - promotion and capture
@@ -311,18 +311,18 @@ int pos_gen_pseudomoves(pos_t *pos)
         bitboard_t rel_rank1 = bb_rel_rank(RANK_1, us);
         from = pos->king[us];
         square_t from_square[2] = { E1, E8 };     /* verify king is on E1/E8 */
-        bug_on(CAN_CASTLE(pos->castle, us) && from != from_square[us]);
+        bug_on(can_castle(pos->castle, us) && from != from_square[us]);
         /* For castle, we check the opponent attacks on squares between from and to.
          * To square attack check will be done in gen_is_legal.
          */
-        if (CAN_OO(pos->castle, us)) {
+        if (can_oo(pos->castle, us)) {
             bitboard_t occmask = rel_rank1 & (FILE_Fbb | FILE_Gbb);
             if (!(occ & occmask) &&
                 !sq_attackers(pos, occ, from+1, them)) { /* f1/f8 */
                 moves[nmoves++] = move_make_flags(from, from + 2, M_CASTLE_K);
             }
         }
-        if (CAN_OOO(pos->castle, us)) {
+        if (can_ooo(pos->castle, us)) {
             bitboard_t occmask = rel_rank1 & (FILE_Bbb | FILE_Cbb | FILE_Dbb);
             if (!(occ & occmask) &&
                 !sq_attackers(pos, occ, from-1, them)) { /* d1/d8 */
diff --git a/src/move.c b/src/move.c
index 19d8801..1154e11 100644
--- a/src/move.c
+++ b/src/move.c
@@ -110,7 +110,7 @@ char *move_str(char *dst, const move_t move, __unused const int flags)
     sprintf(dst, "%s%s%n", sq_to_string(from), sq_to_string(to), &len);
 
     if (is_promotion(move)) {
-        piece_t promoted = move_promoted(move);
+        piece_t promoted = (piece_t) move_promoted(move);
         sprintf(dst + len, "%s", piece_to_low(promoted));
     }
     return dst;
@@ -147,8 +147,8 @@ static int _moves_cmp_bysquare(const void *p1, const void *p2)
     square_t t1 = move_to(m1);
     square_t f2 = move_from(m2);
     square_t t2 = move_to(m2);
-    piece_t prom1 = move_promoted(m1);
-    piece_t prom2 = move_promoted(m2);
+    piece_type_t prom1 = move_promoted(m1);
+    piece_type_t prom2 = move_promoted(m2);
     if (f1 < f2) return -1;
     if (f1 > f2) return 1;
     /* f1 == f2 */
diff --git a/src/move.h b/src/move.h
index cc531ba..19fbb66 100644
--- a/src/move.h
+++ b/src/move.h
@@ -19,8 +19,8 @@
 #include "board.h"
 
 /* move structure:
- * 3 3    2 2    1 1 1 1 1 1
- * 1 0    5 3    8 7 5 4 2 1    6 5    0
+ * 3 3     2 2    1 1 1 1 1 1
+ * 1 0     4 3    8 7 5 4 2 1    6 5    0
  * S UUUUUUU FFFFFF ccc ppp tttttt ffffff
  *
  * bits    len off range         type         mask        get  desc
@@ -84,7 +84,7 @@ static inline square_t move_to(move_t move)
     return (move >> M_OFF_TO) & 077;
 }
 
-static inline piece_t move_promoted(move_t move)
+static inline piece_type_t move_promoted(move_t move)
 {
     return (move >> M_OFF_PROMOTED) & 07;
 }
@@ -94,7 +94,6 @@ static inline piece_type_t move_captured(move_t move)
     return (move >> M_OFF_CAPTURED) & 07;
 }
 
-
 static inline move_t move_make(square_t from, square_t to)
 {
     return (to << M_OFF_TO) | from;
@@ -112,7 +111,7 @@ static inline move_t move_make_capture(square_t from, square_t to)
 
 static inline move_t move_make_enpassant(square_t from, square_t to)
 {
-    return move_make_flags(from, to, M_CAPTURE | M_ENPASSANT);
+    return move_make_flags(from, to, M_ENPASSANT);
 }
 
 static inline move_t move_make_promote(square_t from, square_t to,