From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Sat, 26 Jan 2013 17:08:37 +0000 (+0100)
Subject: Adjudicate pawn-drop mate as loss in Shogi
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=94f3427e1b21ef9242770d4889a67fd024b9c897;p=xboard.git

Adjudicate pawn-drop mate as loss in Shogi

Mating with a Pawn drop is illegal in Shogi, but rather than burdoning
the legality-testing by this complex rule, we simply invert the result
for such a mate. After all, Shogi customs are such that everything illegal
leads to an immediate loss.
---

diff --git a/backend.c b/backend.c
index 67e2d1b..2028269 100644
--- a/backend.c
+++ b/backend.c
@@ -7764,6 +7764,14 @@ Adjudicate (ChessProgramState *cps)
 	      case MT_CHECKMATE:
 		reason = "Xboard adjudication: Checkmate";
 		boards[forwardMostMove][EP_STATUS] = (gameInfo.variant == VariantLosers ? EP_WINS : EP_CHECKMATE);
+		if(gameInfo.variant == VariantShogi) {
+		    if(forwardMostMove > backwardMostMove
+		       && moveList[forwardMostMove-1][1] == '@'
+		       && CharToPiece(ToUpper(moveList[forwardMostMove-1][0])) == WhitePawn) {
+			reason = "XBoard adjudication: pawn-drop mate";
+			boards[forwardMostMove][EP_STATUS] = EP_WINS;
+		    }
+		}
 		break;
 	    }