From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Wed, 28 Dec 2016 18:26:47 +0000 (+0100)
Subject: Suppress check test after null move
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=3c8dce920afe1b8164c8bf8ce582cce0de9735ff;p=crazywa.git

Suppress check test after null move

After null move we should never be in check, but the test for determining
it would use variables that might not be initialized (like to-square).
Make sure we indicate there is no check (also in checkDist, which is used
testing for distant checks).
---

diff --git a/dropper.c b/dropper.c
index 0510ee8..d755acf 100644
--- a/dropper.c
+++ b/dropper.c
@@ -871,6 +871,7 @@ DiscoTest (int stm, int fromSqr, int king, StackFrame *f)
 void
 CheckTest (int stm, StackFrame *ff, StackFrame *f)
 {
+    if(ff->mutation == -2) f.checker = CK_NONE, f.checkDist = 0; else { // null move never checks
 	int king = location[stm+31]; // own King
 	int vec = king - ff->toSqr;
 	int match = captCode[vec] & pieceCode[ff->toPiece];
@@ -884,6 +885,7 @@ CheckTest (int stm, StackFrame *ff, StackFrame *f)
 	    DiscoTest(stm, ff->fromSqr, king, ff);
 	    if(board[ff->captSqr] == 0) DiscoTest(stm, ff->captSqr, king, ff); // e.p. capture can discover check as well
 	}
+    }
 }
 
 int