From 78c966ef9c0a3451aecb4abcc48f9e0944757990 Mon Sep 17 00:00:00 2001
From: eug-vs <eug-vs@keemail.me>
Date: Mon, 14 Jun 2021 16:01:19 +0300
Subject: fix: generate moves for black correctly

---
 src/main.c   | 17 ++++++++---------
 src/pieces.h |  3 +++
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/src/main.c b/src/main.c
index 786c882..cbdd862 100644
--- a/src/main.c
+++ b/src/main.c
@@ -114,7 +114,7 @@ int generate_legal_moves(int origin, int* board) {
   int piece = board[origin];
   int* move;
 
-  switch (piece) {
+  switch (piece & NO_COLOR) {
     case KNIGHT:
       move = knightMoves;
       break;
@@ -131,21 +131,20 @@ int generate_legal_moves(int origin, int* board) {
       move = kingMoves;
       break;
     case PAWN:
-      move = pawnMoves;
+      if (piece & BLACK) move = blackPawnMoves;
+      else move = pawnMoves;
       break;
     default:
+      puts("No piece found!");
       move = NULL;
   }
 
   while(*move) {
-    for (int square = origin; !(square & 0x88); square += *move) {
-      if (square != origin) {
-        if (board[square] != EMPTY) break;
-        board[square] = VISUAL;
-        if (piece == PAWN || piece == KNIGHT || piece == KING) break;
-      }
+    for (int square = origin + *move; !(square & 0x88); square += *move) {
+      if (board[square] != EMPTY) break;
+      board[square] = VISUAL;
+      if ((piece & NO_COLOR) == PAWN || piece == KNIGHT || piece == KING) break;
     }
-
     move++;
   }
 }
diff --git a/src/pieces.h b/src/pieces.h
index 9821695..2289f2c 100644
--- a/src/pieces.h
+++ b/src/pieces.h
@@ -1,5 +1,7 @@
 #define WHITE  0b0000
 #define BLACK  0b0001
+#define NO_COLOR 0b1110
+
 
 #define EMPTY  0b0000
 #define VISUAL 0b0001
@@ -28,6 +30,7 @@ int queenMoves[] = { 17, 16, 15, 1, -1, -15, -16, -17, 0 };
 int knightMoves[] = { 33, 31, 18, 14, -33, -31, -18, -14, 0 };
 int kingMoves[] = { 17, 16, 15, 1, -1, -15, -16, -17, 0 };
 int pawnMoves[] = { 17, 16, 15, 0 };
+int blackPawnMoves[] = { -17, -16, -15, 0 };
 
 #define FILE_MASK 0b1111
 
-- 
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