Author: Anthony Cozzie
Date: 10:56:20 02/22/05
Go up one level in this thread
On February 22, 2005 at 13:25:09, Uri Blass wrote:
>On February 22, 2005 at 12:40:52, Anthony Cozzie wrote:
>
>>On February 22, 2005 at 08:35:07, Andrew Wagner wrote:
>>
>>>Hi all.
>>>I got sidetracked this morning by an interesting chess programming problem. It
>>>took me a couple hours, but I think I have a working algorithm -- haven't tested
>>>yet though. Anyway, I got to wondering if others would approach it the same way.
>>>So I thought I'd make a little competition of it. Post your code here, and I'll
>>>pick the program I like best and shower praise and adulation on its author. If
>>>people like this challenge, maybe I'll do one each month or something. Anyway,
>>>here's the one I did this morning:
>>>There are 64 x 63 = 4032 ways to put a black knight and white knoght both on a
>>>chess board. Write a program -- from scratch -- to generate FENs for each of
>>>these positions. The FENs should look something like: Nn6/8/8/8/8/8/8/8 w - - 0
>>>1.
>>>
>>>I think my code will wind up weighing in at around 60-70 lines of C. Can you do
>>>better?
>>
>>100% untested.
>>
>>#include "stdio.h"
>>
>>int main(void)
>>{
>> char board[64] =
>>{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
>>fentable = {0, 'n', 'N'};
>>
>> for(int i = 0; i < 4096; i++) {
>> int wn = i & 0x3F, bn = i >> 6;
>> if(wn == bn)
>> continue;
>> board[wn] = 1;
>> board[bn] = 2;
>>
>> for(int rank = 7; rank >= 0; rank--) {
>> for(int file = 0, empty = 0; file < 8; file++) {
>> if(empty && (board[rank*8+file] || file == 7)) {
>> printf("%d", empty);
>> empty = 0;
>> }
>> else
>> empty++;
>> if(board[rank*8+file])
>> printf("%c", fentable[board[rank*8+file]]);
>> }
>> printf("/");
>> }
>>
>> printf(" - - 0 1\n");
>> board[wn] = board[bn] = 0;
>> }
>>}
>
>Your code seems to be with the best basis
>
>Here are correction to some bugs and hopefully there are no bugs left
>
>int main(void)
>{
> char board[64] =
>{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
>fentable[3] = {0, 'n', 'N'};
>
> for(int i = 0; i < 4096; i++) {
> int wn = i & 0x3F, bn = i >> 6;
> if(wn == bn)
> continue;
> board[wn] = 1;
> board[bn] = 2;
>
> for(int rank = 7; rank >= 0; rank--) {
> for(int file = 0, empty = 0; file < 8; file++) {
> if (board[rank*8+file])
> {
> if (empty>0)
> printf("%d", empty);
> printf("%c", fentable[board[rank*8+file]]);
> empty = 0;
> }
> else
> {
> empty++;
> if (file==7)
> printf("%d", empty);
> }
>
> }
> if (rank>0) printf("/");
> }
>
> printf(" - - 0 1\n");
> board[wn] = board[bn] = 0;
> }
> return 0;
>}
Better?
#include "stdio.h"
int main(void)
{
char board[64] =
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
fentable = {0, 'n', 'N'};
for(int i = 0; i < 4096; i++) {
int wn = i & 0x3F, bn = i >> 6;
if(wn == bn)
continue;
board[wn] = 1;
board[bn] = 2;
for(int rank = 7; rank >= 0; rank--) {
for(int file = 0, empty = 0; file < 8; file++) {
if(empty && (board[rank*8+file] || file == 7)) {
printf("%d", empty+!board[rank*8+file]);
empty = 0;
}
else
empty++;
if(board[rank*8+file])
printf("%c", fentable[board[rank*8+file]]);
}
printf("/");
}
printf(" - - 0 1\n");
board[wn] = board[bn] = 0;
}
}
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.