From a7df98a990613a11a1c0696b47a370f63c8a26f5 Mon Sep 17 00:00:00 2001
From: Jesse McDonald <nybble41@gmail.com>
Date: Sun, 5 Apr 2020 17:39:47 -0500
Subject: [PATCH] fix for prev_turn has no effect when mid-chain

---
 js/pacosako_ui.js | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/js/pacosako_ui.js b/js/pacosako_ui.js
index 8163b44..5a221f4 100644
--- a/js/pacosako_ui.js
+++ b/js/pacosako_ui.js
@@ -789,12 +789,15 @@ $(function (){
    });
 
    $('#cb_nav_prev_turn').on('click', function(){
-      const player = visibleGame.player;
-      while (visibleGame.canUndo) {
+      if (visibleGame.canUndo) {
          visibleGame.undo();
-         if (visibleGame.player === player) {
-            visibleGame.redo();
-            break;
+         const player = visibleGame.player;
+         while (visibleGame.canUndo) {
+            visibleGame.undo();
+            if (visibleGame.player !== player) {
+               visibleGame.redo();
+               break;
+            }
          }
       }
       renderBoard();