From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Thu, 25 Sep 2014 17:11:21 +0000 (+0200)
Subject: Always accept piece commands in partly supported variants
X-Git-Url: http://hgm.nubati.net/cgi-bin/gitweb.cgi?p=xboard.git;a=commitdiff_plain;h=90023cb65d9c783d7f045f839dec64292f50e524

Always accept piece commands in partly supported variants

Normally piece commands are ignored when legality checking is on, as
XBoard's idea of legality should obviously overrule the engine's.
In variants that are not or only partly supported, however, XBoard has
no own idea of what is legal, so it is better to take the engine's
advice than enforcing wrong rules.
---

diff --git a/backend.c b/backend.c
index ec9cfbb2..9495083a 100644
--- a/backend.c
+++ b/backend.c
@@ -8893,7 +8893,11 @@ FakeBookMove: // [HGM] book: we jump here to simulate machine moves after book h
     if(sscanf(message, "piece %s %s", buf2, buf1) == 2) {
       ChessSquare piece = WhitePawn;
       char *p=buf2;
-      if(cps != &first || appData.testLegality) return;
+      if(cps != &first || appData.testLegality && *engineVariant == NULLCHAR
+      /* For variants we don't have   */       && gameInfo.variant != VariantBerolina
+      /* correct rules for, we cannot */       && gameInfo.variant != VariantCylinder
+      /* enforce legality on our own! */       && gameInfo.variant != VariantUnknown
+                                               && gameInfo.variant != VariantFairy    ) return;
       if(*p == '+') piece = CHUPROMOTED WhitePawn, p++;
       piece += CharToPiece(*p) - WhitePawn;
       if(piece < EmptySquare) {