From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Mon, 4 Jul 2022 17:57:25 +0000 (+0200)
Subject: Fix null move
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=43f7a4356bbfb306b6a5e4900277fab16e3a6ccd;p=xboard.git

Fix null move
---

diff --git a/backend.c b/backend.c
index 9460ad0..c56b796 100644
--- a/backend.c
+++ b/backend.c
@@ -7444,8 +7444,10 @@ FinishMove (ChessMove moveType, int fromX, int fromY, int toX, int toY, int prom
 	bookHit = SendMoveToBookUser(forwardMostMove-1, &first, FALSE);
 	first.maybeThinking = TRUE;
     } else if(fromY == DROP_RANK && fromX == EmptySquare) {
+      if(PosFlags(0) & F_NULL_MOVE) SendMoveToProgram(currentMove, &first); else {
 	if(!first.useSetboard) SendToProgram("undo\n", &first); // kludge to change stm in engines that do not support setboard
 	SendBoard(&first, currentMove+1);
+      }
 	if(second.analyzing) {
 	    if(!second.useSetboard) SendToProgram("undo\n", &second);
 	    SendBoard(&second, currentMove+1);