implement detecting castling for moves - chess-puzzles - chess puzzle book generator
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---
(DIR) commit d1450a9bf4d9b009733094038420a82a6872a8ae
(DIR) parent 09a541233ed6f1abf9f4498b37d1281a78f65ce8
(HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Tue, 19 Dec 2023 00:31:55 +0100
implement detecting castling for moves
Diffstat:
M fen_to_svg.c | 33 ++++++++++++++++++++++++++++++-
1 file changed, 32 insertions(+), 1 deletion(-)
---
(DIR) diff --git a/fen_to_svg.c b/fen_to_svg.c
@@ -286,7 +286,38 @@ main(int argc, char *argv[])
place(piece, x2, y2);
s += 2;
- /* possible promotion? (queen, knight, bishop) */
+ /* castling */
+ if (piece == 'K' && y == 7 && y2 == 7 && x == 4) {
+ /* white: kingside castling: "e1g1" */
+ if (x2 == 6) {
+ place('R', x2 - 1, y2);
+ x2 = 7;
+ y2 = 7;
+ place(0, x2, y2); /* clear rook square */
+ } else if (x2 == 2) {
+ /* white: queenside castling: "e1c1" */
+ place('R', x2 + 1, y2);
+ x2 = 0;
+ y2 = 7;
+ place(0, x2, y2);
+ }
+ } else if (piece == 'k' && y == 0 && y2 == 0 && x == 4) {
+ /* black: kingside castling: "e8g8" */
+ if (x2 == 6) {
+ place('r', x2 - 1, y2);
+ x2 = 7;
+ y2 = 0;
+ place(0, x2, y2); /* clear rook square */
+ } else if (x2 == 2) {
+ /* black: queenside castling: "e8c8" */
+ place('r', x2 + 1, y2);
+ x2 = 0;
+ y2 = 0;
+ place(0, x2, y2); /* clear rook square */
+ }
+ }
+
+ /* possible promotion: queen, knight, bishop */
if (*s == 'q' || *s == 'n' || *s == 'b') {
if (side_to_move == 'w')
piece = toupper(*s);