Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: 45 degree rotated bitboards for Bishops

Author: Robert Hyatt

Date: 21:48:23 12/30/03

Go up one level in this thread


On December 30, 2003 at 23:27:13, Ed Trice wrote:

>The one rotation was not too bad...
>

When I started developing this idea, they _all_ gave me a huge
headache.  :)



>
>int init_ur45[80] = {        9,
>									                             8,   19,
>								                            7,  18,  29,
>                                  6, 17,  28,  39,
>                                5, 16, 27,  38,  49,
>                              4, 15, 26, 37,  48,  59,
>                            3, 14, 25, 36, 47,  58,  69,
>                          2, 13, 24, 35, 46, 57,   68,  79,
>                        1, 12, 23, 34, 45,  56,  67,  78,
>                      0,  11, 22, 33, 44, 55, 66, 77,
>                        10, 21, 32, 43, 54, 65, 76,
>                         20, 31, 42, 53, 64, 75,
>                           30, 41, 52, 63, 74,
>                             40, 51, 62, 73,
>                               50, 61, 72,
>                                 60, 71,
>                                   70
>                                   };
>
>...but this one gave me a headache!
>
>int init_r45[80] = {				    44,
>									                            36, 28,
>								                           21, 15, 10,
>                                   6,  3,  1, 0,
>                                52, 45, 37, 29, 22,
>                              16, 11,  7,  4,  2, 59,
>                            53, 46, 38, 30, 23, 17, 12,
>                           8,  5, 65, 60, 54, 47, 39, 31,
>                        24, 18, 13,  9, 70, 66, 61, 55,
>                      48, 40, 32, 25, 19, 14, 74, 71,
>                        67, 62, 56, 49, 41, 33, 26,
>                         20, 77, 75, 72, 68, 63,
>                           57, 50, 42, 34, 27,
>                             79, 78, 76, 73,
>                               69, 64, 58,
>                                 51, 43,
>                                   35
>                                   };



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.