Allow use of second-row pieces for non-promoted in drop games

Second-row pieces were automatically demoted on capture, but this
should really happen only when the piece-to-char table says it is a
shogi-promoted piece (assigned a '+' there). Pieces assigned a letter
should really stay themselves.
 PieceToNumber had to be adapted to skip '+' pieces in order to count
correctly for second-row pieces, as did the code in UserMoveEvent() that
mapped the from-square onto the piece type. (Why do we do that anyway?
The piece type was displayed on the from-square!)

diff --git a/backend.c b/backend.c
index f988046..b248d03 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -6986,7 +6986,7 @@ UserMoveEvent(int fromX, int fromY, int toX, int toY, int promoChar)
           // holdings might not be sent yet in ICS play; we have to figure out which piece belongs here
           if(fromX == 0) fromY = BOARD_HEIGHT-1 - fromY; // black holdings upside-down
           fromX = fromX ? WhitePawn : BlackPawn; // first piece type in selected holdings
-          while(PieceToChar(fromX) == '.' || PieceToNumber(fromX) != fromY && fromX != (int) EmptySquare) fromX++;
+          while(PieceToChar(fromX) == '.' || PieceToChar(fromX) == '+' || PieceToNumber(fromX) != fromY && fromX != (int) EmptySquare) fromX++;
          fromY = DROP_RANK;
     }
 
@@ -10149,8 +10149,8 @@ ApplyMove (int fromX, int fromY, int toX, int toY, int promoChar, Board board)
         p = (int) captured;
         if (p >= (int) BlackPawn) {
           p -= (int)BlackPawn;
-          if(gameInfo.variant == VariantShogi && DEMOTED p >= 0) {
-                  /* in Shogi restore piece to its original  first */
+          if(DEMOTED p >= 0 && PieceToChar(p) == '+') {
+                  /* Restore shogi-promoted piece to its original  first */
                   captured = (ChessSquare) (DEMOTED captured);
                   p = DEMOTED p;
           }
@@ -10160,7 +10160,7 @@ ApplyMove (int fromX, int fromY, int toX, int toY, int promoChar, Board board)
           board[p][BOARD_WIDTH-1] = BLACK_TO_WHITE captured;
        } else {
           p -= (int)WhitePawn;
-          if(gameInfo.variant == VariantShogi && DEMOTED p >= 0) {
+          if(DEMOTED p >= 0 && PieceToChar(p) == '+') {
                   captured = (ChessSquare) (DEMOTED captured);
                   p = DEMOTED p;
           }

diff --git a/moves.c b/moves.c
index bcaef30..015f5f2 100644 (file)
--- a/moves.c
+++ b/moves.c
@@ -135,7 +135,7 @@ PieceToNumber (ChessSquare p)  /* [HGM] holdings: count piece type, ignoring non
     int i=0;
     ChessSquare start = (int)p >= (int)BlackPawn ? BlackPawn : WhitePawn;
 
-    while(start++ != p) if(pieceToChar[(int)start-1] != '.') i++;
+    while(start++ != p) if(pieceToChar[start-1] != '.' && pieceToChar[start-1] != '+') i++;
     return i;
 }