From 92b08ac08fd555fee90402509284bf79b7d37070 Mon Sep 17 00:00:00 2001
From: Petr Baudis <pasky@ucw.cz>
Date: Mon, 30 Jul 2012 22:04:53 +0200
Subject: [PATCH] RULES_PASS_STONES: Correctly support undo

---
 board.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/board.c b/board.c
index aa69f21..2f72122 100644
--- a/board.c
+++ b/board.c
@@ -1388,6 +1388,10 @@ int board_undo(struct board *board)
 {
 	if (!is_pass(board->last_move.coord))
 		return -1;
+	if (board->rules == RULES_PASS_STONES) {
+		/* Return pass stone to the passing player. */
+		board->captures[stone_other(board->last_move.color)]--;
+	}
 	board->last_move = board->last_move2;
 	board->last_move2 = board->last_move3;
 	board->last_move3 = board->last_move4;
-- 
2.11.4.GIT