diff --git a/src/main.zig b/src/main.zig
index 1cad363..59f70bc 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -53,7 +53,7 @@ fn uciPos(str: []const u8, alloc: std.mem.Allocator) *types.game {
     if (std.mem.eql(u8, tok, "fen")) return fenGame(str[pos..], alloc);
     if (std.mem.eql(u8, tok, "startpos")) {
         var game = fenGame("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1", alloc);
-        game = mov.playMoves(game, str[pos..]);
+        game = mov.playMoves(game, str[(pos)..]);
         return game;
     }
     return fenGame("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1", alloc); //this should be an error
@@ -95,7 +95,7 @@ fn uciGo(game: *types.game, alloc: std.mem.Allocator) []u8 {
     const str = alloc.alloc(u8, 5) catch unreachable;
     mov.knightMove(game, &moves);
     if (moves.capacity == 0) {
-        @memcpy(str.ptr, "err");
+        @memcpy(str.ptr, "0000");
         return str;
     }
     mov.moveTypeToStr(moves.items[0], str);
diff --git a/src/move.zig b/src/move.zig
index d159375..dd90d28 100644
--- a/src/move.zig
+++ b/src/move.zig
@@ -25,6 +25,8 @@ pub fn playMoves(game: *types.game, str: []const u8) *types.game {
     if (str.len < 4) return game;
     var splitItr = std.mem.splitSequence(u8, str, " ");
     while (splitItr.next()) |moveString| {
+        if (moveString.len < 4 or moveString[0] > 'h')
+            continue;
         var move: types.move = .{ .To = 0, .From = 0, .Promo = 0 };
         if (moveString.len < 4) continue;
         move.From = (moveString[0] - 'a') + (moveString[1] - '1') * 8;