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#include "chess.h"
#include "data.h"
/* last modified 01/17/09 */
/*
*******************************************************************************
* *
* ResignOrDraw() is used to determine if the program should either resign *
* or offer a draw. This decision is based on two criteria: (1) current *
* search evaluation and (2) time remaining on opponent's clock. *
* *
* The evaluation returned by the last search must be less than the resign *
* threshold to trigger the resign code, or else must be exactly equal to *
* the draw score to trigger the draw code. *
* *
* The opponent must have enough time to be able to win or draw the game if *
* it were played out as well. *
* *
*******************************************************************************
*/
void ResignOrDraw(TREE * RESTRICT tree, int value) {
int result = 0;
/*
************************************************************
* *
* If the game is a technical draw, where there are no *
* pawns and material is balanced, then offer a draw. *
* *
************************************************************
*/
if (Drawn(tree, value) == 1)
result = 2;
/*
************************************************************
* *
* First check to see if the increment is 2 seconds or *
* more. If so, then the game is being played slowly *
* enough that a draw offer or resignation is worth *
* consideration. Otherwise, if the opponent has at *
* least 30 seconds left, he can probably play the draw *
* or win out. *
* *
* If the value is below the resignation threshold, then *
* Crafty should resign and get on to the next game. Note *
* that it is necessary to have a bad score for *
* <resign_count> moves in a row before resigning. *
* *
************************************************************
*/
if ((tc_increment > 200) || (tc_time_remaining[Flip(root_wtm)] >= 3000)) {
if (resign) {
if (value < -(MATE - 15)) {
if (++resign_counter >= resign_count)
result = 1;
} else if (value < -resign * 100 && value > -(MATE - 300)) {
if (++resign_counter >= resign_count)
result = 1;
} else
resign_counter = 0;
}
}
/*
************************************************************
* *
* If the value is almost equal to the draw score, then *
* Crafty should offer the opponent a draw. Note that . *
* it is necessary that the draw score occur on exactly *
* <draw_count> moves in a row before making the offer. *
* Note also that the draw offer will be repeated every *
* <draw_count> moves so setting this value too low can *
* make the program behave "obnoxiously." *
* *
************************************************************
*/
if ((tc_increment > 200) || (tc_time_remaining[Flip(root_wtm)] >= 3000)) {
if (Abs(Abs(value) - Abs(DrawScore(wtm))) < 2 && moves_out_of_book > 3) {
if (++draw_counter >= draw_count) {
draw_counter = 0;
result = 2;
}
} else
draw_counter = 0;
}
/*
************************************************************
* *
* Now print the draw offer or resignation if appropriate *
* but be sure and do it in a form that ICC/FICS will *
* understand if the "xboard" flag is set. *
* *
* Note that we also use the "speak" facility to verbally *
* offer draws or resign if the "speech" variable has *
* been set to 1 by entering "speech on" *
* *
************************************************************
*/
if (result == 1) {
learn_value = (crafty_is_white) ? -300 : 300;
LearnBook();
if (xboard)
Print(4095, "resign\n");
if (audible_alarm)
printf("%c", audible_alarm);
if (speech) {
char announce[128];
strcpy(announce, SPEAK);
strcat(announce, "Resign");
system(announce);
}
if (crafty_is_white) {
Print(4095, "0-1 {White resigns}\n");
strcpy(pgn_result, "0-1");
} else {
Print(4095, "1-0 {Black resigns}\n");
strcpy(pgn_result, "1-0");
}
}
if (offer_draws && result == 2) {
draw_offered = 1;
if (!xboard) {
Print(128, "\nI offer a draw.\n\n");
if (audible_alarm)
printf("%c", audible_alarm);
if (speech) {
char announce[128];
strcpy(announce, SPEAK);
strcat(announce, "Drawoffer");
system(announce);
}
} else if (xboard)
Print(4095, "offer draw\n");
else
Print(4095, "\n*draw\n");
} else
draw_offered = 0;
}
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