From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Tue, 12 Feb 2013 15:03:36 +0000 (+0100)
Subject: Fix bug in Berolina e.p. capture
X-Git-Tag: 4.8S~11
X-Git-Url: http://winboard.nl/cgi-bin?p=fairymax.git;a=commitdiff_plain;h=a6e756fc912dd7c895816bd5b117b080bc84b582;hp=857ddcade2d574782d3d8643bedcaf42b79f483f

Fix bug in Berolina e.p. capture

A move to the e.p. square in Berolina is not always an attempt to
capture e.p., but can also be a normal non-capture. The latter were
refused, however, because the capture square was always shifted for
Pawn moves to the e.p. square. Now it is only done when the move
has capture rights associated with it.
---

diff --git a/fairymax.c b/fairymax.c
index 792ceeb..20b63dd 100644
--- a/fairymax.c
+++ b/fairymax.c
@@ -187,7 +187,7 @@ int k,q,l,e,E,z,n;      /* (q,l)=window, e=current eval. score, E=e.p. sqr.*/
       }
 #endif
       m=E<16|(E^112)<16&&flag&1&y-E<2&E-y<2?I:m;      /* bad castling  */
-      if(p<3&y==E)H=z&127;                     /* shift capt.sqr. H if e.p.*/
+      if(p<3&y==E&flag)H=z&127;                /* shift capt.sqr. H if e.p.*/
       t=b[H];
       if(flag&1+!t)                            /* mode (capt/nonc) allowed?*/
       {if(t&&(t&16)==k)break;                  /* capture own              */