Fix book encoding of Chu promotion moves

The Shogi promotion suffix had promotion code 8, which was not available
in Chu at all, due to the large board size. So in stead we use code 1 now.
Code 10 (or 2 in Chu) is reserved for encoding Lion moves, which currently
do not work at all.

diff --git a/book.c b/book.c
index 8872d16..8b4a43c 100644 (file)
--- a/book.c
+++ b/book.c
@@ -502,11 +502,19 @@ move_to_string (char move_s[6], uint16 move)
     move_s[2] = tf + 'a';
     move_s[3] = tr + '1' - (BOARD_HEIGHT > 9);
 
+    if(IS_SHOGI(gameInfo.variant) && p) {
+       if(p == 2) p = 10;     // Lion moves, for boards so big that 10 is out of range
+       else if(p != 7) p = 8; // use '+' for all others that do not explicitly defer
+    }
+
     // kludge: encode drops as special promotion code
     if(gameInfo.holdingsSize && p == 9) {
        move_s[0] = f + '@'; // from square encodes piece type
        move_s[1] = '@';     // drop symbol
        p = 0;
+    } else if(p == 10) { // decode Lion move
+       
+       p = 0;
     }
 
     // add promotion piece, if any
@@ -716,7 +724,7 @@ char *
 MovesToText(int count, entry_t *entries)
 {
        int i, totalWeight = 0;
-       char algMove[6];
+       char algMove[12];
        char *p = (char*) malloc(40*count+1);
        for(i=0; i<count; i++) totalWeight += entries[i].weight;
        *p = 0;
@@ -741,6 +749,7 @@ CoordsToMove (int fromX, int fromY, int toX, int toY, char promoChar)
     int from = fromX - BOARD_LEFT + fromY * width;
     for(i=0; promote_pieces[i]; i++) if(promote_pieces[i] == promoChar) break;
     if(!promote_pieces[i]) i = 0;
+    else if(i == 9 && gameInfo.variant == VariantChu) i = 1; // on 12x12 only 3 promotion codes available, so use 1 to indicate promotion
     if(fromY == DROP_RANK) i = 9, from = ToUpper(PieceToChar(fromX)) - '@';
     return to + (i * width * BOARD_HEIGHT + from) * width * BOARD_HEIGHT;
 }
@@ -983,7 +992,6 @@ AddGameToBook (int always)
     }
 
     if(appData.debugMode) fprintf(debugFP, "add game to book (%d-%d)\n", backwardMostMove, forwardMostMove);
-
     for(i=backwardMostMove; i<forwardMostMove && i < 2*appData.bookDepth; i++)
        AddToBook(i, WhiteOnMove(i) ? result : 2-result); // flip result when black moves
 }