New RookAttacks() - possibly

[Gerd Isenberg]

I'm having a difficult time.

Code: Select all

u64 RookAttacks(u08 sq, bbu occ) {
  u64 bb = ss1[sq][(occ.b64 >> ((sq & 56) + 1)) & 63];
  occ.b64 >>= (sq & 7) & 0x0001010101010100;
  bb &= ss2[sq][0][occ.b08.rank1];
  bb &= ss2[sq][1][occ.b08.rank2];
  bb &= ss2[sq][2][occ.b08.rank3];
  bb &= ss2[sq][3][occ.b08.rank4];
  bb &= ss2[sq][4][occ.b08.rank5];
  bb &= ss2[sq][5][occ.b08.rank6];
  return bb;

Wow! Takes some time to understand and verify

[Michael Sherwin]

I'm having a difficult time.

Code: Select all

u64 RookAttacks(u08 sq, bbu occ) {
  u64 bb = ss1[sq][(occ.b64 >> ((sq & 56) + 1)) & 63];
  occ.b64 >>= (sq & 7) & 0x0001010101010100;
  bb &= ss2[sq][0][occ.b08.rank1];
  bb &= ss2[sq][1][occ.b08.rank2];
  bb &= ss2[sq][2][occ.b08.rank3];
  bb &= ss2[sq][3][occ.b08.rank4];
  bb &= ss2[sq][4][occ.b08.rank5];
  bb &= ss2[sq][5][occ.b08.rank6];
  return bb;

Wow! Takes some time to understand and verify

Hi Gerd, Glad to see that you are still around!

I started a new thread in which I believe that I did a better job explaining.