From: Fabian Fichter <ianfab@users.noreply.github.com>
Date: Tue, 30 Apr 2019 20:59:38 +0000 (+0200)
Subject: Fix check extension for drop variants
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=0a686f08769bccabec8a2235d858d73351d3135c;p=fairystockfish.git

Fix check extension for drop variants
---

diff --git a/src/search.cpp b/src/search.cpp
index 48921e3..1de3201 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -947,7 +947,7 @@ moves_loop: // When in check, search starts from here
 
       // Check extension (~2 Elo)
       else if (    givesCheck
-               && (pos.blockers_for_king(~us) & from_sq(move) || pos.see_ge(move)))
+               && ((type_of(move) != DROP && (pos.blockers_for_king(~us) & from_sq(move))) || pos.see_ge(move)))
           extension = ONE_PLY;
       else if (    pos.must_capture() // Capture extension (all moves are captures)
                &&  pos.capture(move)