From fc59a21875f42703ed57bc69f44a48bcee2f89ec Mon Sep 17 00:00:00 2001
From: H.G.Muller <hgm@hgm-xboard.(none)>
Date: Mon, 28 Mar 2016 21:37:52 +0200
Subject: [PATCH] Suppress participation of second engine in EPD mode

Starting the second engine, and initializng it for the next game in
TwoMachineEvent() is now suppressed in EPD mode, so that the latter
even works with a non-existent second engine.
---
 backend.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/backend.c b/backend.c
index b832d16..d879de7 100644
--- a/backend.c
+++ b/backend.c
@@ -15024,6 +15024,7 @@ TwoMachinesEvent P((void))
       ScheduleDelayedEvent(TwoMachinesEventIfReady, 10);
       return;
     }
+  if(!appData.epd) {
     if(WaitForEngine(&second, TwoMachinesEventIfReady)) return; // (if needed:) started up second engine, so wait for features
 
     if(!SupportedVariant(second.variants, gameInfo.variant, gameInfo.boardWidth,
@@ -15042,6 +15043,7 @@ TwoMachinesEvent P((void))
       ScheduleDelayedEvent(TwoMachinesEventIfReady, 10);
       return;
     }
+  }
     GetTimeMark(&now); // [HGM] matchpause: implement match pause after engine load
     if(appData.matchPause>10000 || appData.matchPause<10)
                 appData.matchPause = 10000; /* [HGM] make pause adjustable */
@@ -15053,6 +15055,7 @@ TwoMachinesEvent P((void))
     // we are now committed to starting the game
     stalling = 0;
     DisplayMessage("", "");
+  if(!appData.epd) {
     if (startedFromSetupPosition) {
 	SendBoard(&second, backwardMostMove);
     if (appData.debugMode) {
@@ -15062,6 +15065,7 @@ TwoMachinesEvent P((void))
     for (i = backwardMostMove; i < forwardMostMove; i++) {
 	SendMoveToProgram(i, &second);
     }
+  }
 
     gameMode = TwoMachinesPlay;
     pausing = startingEngine = FALSE;
@@ -15080,11 +15084,13 @@ TwoMachinesEvent P((void))
       snprintf(buf, MSG_SIZ, "name %s\n", second.tidy);
       SendToProgram(buf, &first);
     }
+  if(!appData.epd) {
     SendToProgram(second.computerString, &second);
     if (second.sendName) {
       snprintf(buf, MSG_SIZ, "name %s\n", first.tidy);
       SendToProgram(buf, &second);
     }
+  }
 
     ResetClocks();
     if (!first.sendTime || !second.sendTime) {
-- 
1.7.0.4