knight moves

main.c

@@ -33,6 +33,7 @@ void playMoves(game *g, char *moves);
 long long *findSet(game *g, long long bit);
 long long *charToSet(game *g, char c);
 int pawnMove(game *g, move *moves);
+int knightMove(game *g, move* moves);
 
 long long fullSet(sets *s) {
   return s->bishops ^ s->king ^ s->knights ^ s->pawns ^ s->queen ^ s->rooks;
@@ -90,16 +91,13 @@ int main() {
         g = fenGame("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");
       }
       playMoves(g, lineRest);
-      printf("info pawns\n");
-      // print_bitboard(fullSetBoth(g));
-
     } else if (!strcmp("ucinewgame", token)) {
     } else if (!strcmp("isready", token)) {
       printf("readyok\n");
     } else if (!strcmp("go", token)) {
 
-      move mov[64];
+      move mov[200];
-      int cnt = pawnMove(g, mov);
+      int cnt = knightMove(g, mov);
       move *m = &mov[0];
 
       char *end = "";
@@ -110,7 +108,8 @@ int main() {
       yFrom = m->From / 8 + 1;
 
       if ((g->whiteToMove && yTo == 8) || (!g->whiteToMove && yTo == 1)) {
-        end = "q\n";
+        // end = "q\n";
+	end = "\n";
       } else {
         end = "\n";
       }
@@ -246,6 +245,48 @@ long long *findSet(game *g, long long bit) {
   }
 }
 
+int knightMove(game *g, move *moves) {
+  long long knights = g->whiteToMove ? g->white.knights : g->black.knights;
+  long long occupied = g->whiteToMove ? fullSet(&g->white) : fullSet(&g->black);
+
+  int kMoves[] = {
+    -17, -15,
+    -10, -6,
+    6, 10,
+    15, 17
+  };
+  int index = 0;
+
+  for (int i = 0; i < 64; i++) {
+    long long bit = 1LL << i;
+    if (!(knights & bit))
+      continue;
+
+    for (int j = 0; j < 8; ++j) {
+      int to = i + kMoves[j];
+      if (to < 0 || to > 64)
+        continue;
+
+      int fromFile = i % 8;
+      int toFile = to % 8;
+      int fromRank = i / 8;
+      int toRank = to / 8;
+
+      int fileDiff = abs(fromFile - toFile);
+      int rankDiff = abs(fromRank - toRank);
+      if (!((fileDiff == 1 && rankDiff == 2) || (fileDiff == 2 && rankDiff == 1)))
+        continue;
+
+      long long destBit = 1LL << to;
+      if (occupied & destBit) // Skip if destination has friendly piece
+        continue;
+
+      moves[index++] = (move){.From = i, .To = to};
+    }
+  }
+  return index;
+}
+
 int pawnMove(game *g, move *moves) {
   long long pawns = g->whiteToMove ? g->white.pawns : g->black.pawns;
   long long enemy = g->whiteToMove ? fullSet(&g->black) : fullSet(&g->white);