From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Sun, 31 May 2020 17:22:29 +0000 (+0200)
Subject: Fix oblique multi-leg moves in XBetza
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=b17f0d8ac15d3f245a25c9e02dd010759e6bf3e8;p=xboard.git

Fix oblique multi-leg moves in XBetza

Continuation legs of oblique atoms have thei directional modifiers
interpreted in the K system. But this had as an intended side effect
that they were split into a diagonal and orthogonal atom for separate
treatment, which for obliques is of course not possible, nor needed.
So this code is bypassed for the obliques now.
---

diff --git a/moves.c b/moves.c
index da1aa13..f0fa2db 100644
--- a/moves.c
+++ b/moves.c
@@ -387,6 +387,7 @@ MovesFromString (Board board, int flags, int f, int r, int tx, int ty, int angle
 		    if(!dirSet) dirSet = (tx < 0 ? 0xFF                     // default is all directions, but in continuation leg
 					  : all == 0xFF ? 0xEF : 0x45);     // omits backward, and for 4-fold atoms also diags
 		    dirSet = (dirSet << angle | dirSet >> 8-angle) & 255;   // re-orient direction system
+		    if(dx && dx != dy) break;     // oblique continuation
 		    ds2 = dirSet & 0xAA;          // extract diagonal directions
 		    if(dirSet &= 0x55)            // start with orthogonal moves, if present
 		         retry = 1, dx = 0;       // and schedule the diagonal moves for later