From 63fa6656749d1cdb6a54a001950048a9660f0d73 Mon Sep 17 00:00:00 2001
From: Aargh Rai <aargh.rai+git@gmail.com>
Date: Tue, 24 Feb 2026 22:49:43 +0530
Subject: pawn forward movement works?

---
 src/bitboard.h | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

(limited to 'src/bitboard.h')

diff --git a/src/bitboard.h b/src/bitboard.h
index b92d67f..a816ea6 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -28,11 +28,39 @@ enum {
   BLACK_LONG_CASTLE,
 };
 
+enum {
+  WHITE_TURN,
+  BLACK_TURN,
+};
+
+#define BITMASK_RANK_A 255ULL
+#define BITMASK_RANK_B 65280ULL
+#define BITMASK_RANK_C 16711680ULL
+#define BITMASK_RANK_D 4278190080ULL
+#define BITMASK_RANK_E 1095216660480ULL
+#define BITMASK_RANK_F 280375465082880ULL
+#define BITMASK_RANK_G 71776119061217280ULL
+#define BITMASK_RANK_H 18374686479671623680ULL
+#define BITMASK_COLM_1 72340172838076673ULL
+#define BITMASK_COLM_2 144680345676153346ULL
+#define BITMASK_COLM_3 289360691352306692ULL
+#define BITMASK_COLM_4 578721382704613384ULL
+#define BITMASK_COLM_5 1157442765409226768ULL
+#define BITMASK_COLM_6 2314885530818453536ULL
+#define BITMASK_COLM_7 4629771061636907072ULL
+#define BITMASK_COLM_8 9259542123273814144ULL
+
 typedef struct {
   bitboard_t bitboards[PIECE_TYPE_COUNT];
   u8 castling;
-} position;
+  u8 turn;
+} position_t;
+
+position_t position_starting();
+void assert_valid_position(position_t position);
+bitboard_t whites(position_t position);
+bitboard_t blacks(position_t position);
 
-position starting_position();
+void print_bitboard(bitboard_t bitboard);
 
 #endif // !BITBOARD_H
-- 
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