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

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              */