From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Sat, 8 Oct 2011 18:43:52 +0000 (+0200)
Subject: Incorporate variant type in book hash key
X-Git-Url: http://winboard.nl/cgi-bin?a=commitdiff_plain;h=d55128fc0ce74e35afb57550ea97a361dfb163da;p=xboard.git

Incorporate variant type in book hash key

This prevents booksforone variant being used for another, and allows
multi-variant books.
---

diff --git a/book.c b/book.c
index 6b1198d..a5aa6ab 100644
--- a/book.c
+++ b/book.c
@@ -278,6 +278,23 @@ uint64 hash(int moveNr)
 {
     int r, f, p_enc, squareNr, pieceGroup;
     uint64 key=0, holdingsKey=0, Zobrist;
+    VariantClass v = gameInfo.variant;
+
+    switch(v) {
+	case VariantNormal:
+	case VariantFischeRandom: // compatible with normal
+	case VariantNoCastle:
+	case VariantXiangqi: // for historic reasons; does never collide anyway because of other King type
+	    break;
+	case VariantGiveaway: // in opening same as suicide
+	    key += VariantSuicide;
+	    break;
+	case VariantGothic: // these are special cases of CRC, and can share book
+	case VariantCapablanca:
+	    v = VariantCapaRandom;
+	default:
+	    key += v; // variant type incorporated in key to allow mixed books without collisions
+    }
 
     for(f=0; f<BOARD_WIDTH; f++){
         for(r=0; r<BOARD_HEIGHT;r++){