From aa57fb93f94bdacfdbe92bf259fa5cc2885802a0 Mon Sep 17 00:00:00 2001
From: "H.G. Muller" <h.g.muller@hccnet.nl>
Date: Fri, 26 Nov 2010 10:10:55 +0100
Subject: [PATCH] Restrict drops in variant seirawan to back rank

Drops aren't really llowed at all in Seirawan Ches, but there exists an
engine that supports a variant where drops on the back-rank are allowed.
---
 moves.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/moves.c b/moves.c
index 6fa66936..6ccbb1c0 100644
--- a/moves.c
+++ b/moves.c
@@ -1043,6 +1043,8 @@ if(appData.debugMode) fprintf(debugFP, "LegalDrop: %d @ %d,%d)\n", piece, ft, rt
                 if(board[r][ft] == piece) return IllegalMove; // or there already is a Pawn in file
             // should still test if we mate with this Pawn
         }
+    } else if(gameInfo.variant == VariantSChess) { // only back-rank drops
+        if (rt != (piece < BlackPawn ? 0 : BOARD_HEIGHT-1)) return IllegalMove;
     } else {
         if( (piece == WhitePawn || piece == BlackPawn) &&
             (rt == 0 || rt == BOARD_HEIGHT -1 ) )
-- 
2.17.1