From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Mon, 12 Mar 2012 12:01:29 +0000 (+0100)
Subject: Add option to allow Polyglot to accept draw offers
X-Git-Url: http://winboard.nl/cgi-bin?p=polyglot.git;a=commitdiff_plain;h=d26c5e2ae931c2b05032b1b7cccc675d2088940f

Add option to allow Polyglot to accept draw offers

For engines that do not support the UCI_DrawOffers option, Polyglot
can accept a draw offer based on a contempt score.
---

diff --git a/option.c b/option.c
index e77c799..0feeea7 100644
--- a/option.c
+++ b/option.c
@@ -48,6 +48,8 @@ option_t DefaultOptions[] = {
     { "ResignMoves",      "spin","0","10000",    "3"        , NULL,0,NNB,  PG|XBOARD|XBSEL}, 
     { "QueenNeverResigns","check","0","0",      "true"      , NULL,0,NNB,  PG|XBOARD|XBSEL}, 
     { "ResignScore",      "spin","0","10000",   "600"       , NULL,0,NNB,  PG|XBOARD|XBSEL}, 
+    { "HandleDraws",      "check","0","0",      "false"     , NULL,0,NNB,  PG|XBOARD|XBSEL}, 
+    { "ContemptScore",    "spin","0","10000",   "30"        , NULL,0,NNB,  PG|XBOARD|XBSEL}, 
 
     { "MateScore",        "spin","0","100000",  "10000"     , NULL,0,NNB,  PG|XBOARD}, 
 
diff --git a/xboard2uci.c b/xboard2uci.c
index 00d582b..f0288d7 100644
--- a/xboard2uci.c
+++ b/xboard2uci.c
@@ -231,6 +231,10 @@ void xboard2uci_gui_step(char string[]) {
 			if(option_find(Uci->option,"UCI_DrawOffers")){
 			    my_log("POLYGLOT draw from XB received");
 				uci_send_option(Uci,"DrawOffer","%s","draw");}
+			else if (option_get_bool(Option,"HandleDraws") && Uci->root_move_nb > 20) { // [HGM] PG draw handling
+			    my_log("POLYGLOT draw from XB received");
+			    if (Uci->best_score <= -option_get_int(Option,"ContemptScore")) 
+			        gui_send(GUI,"offer draw");}
 		} else if (match(string,"easy")) {
 
 			XB->ponder = FALSE;