Anonymous user
Generate random chess position: Difference between revisions
m
→{{header|REXX}}: added/changed comments and whitespace; split some compound statement DO groups.
m (→{{header|REXX}}: added/changed comments and whitespace; split some compound statement DO groups.) |
|||
Line 1,688:
do boards=1 for abs(CBs) /* [↓] maybe display separator & title*/
if sign(CBs)\==CBs then do; say; say center(' board' boards" ", 79, '▒'); end
@.=.;
do p=1 for random(2, 32) /*generate a random number of chessmen.*/
if p<3 then call piece 'k' /*a king of each color. */
Line 1,697:
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
cb: fen=; do r=8 for 8 by -1; $=
do f=8 for 8 by -1; $= $ || @.r.f
end /*f*/
say $ /*display the board rank. */
do e=8 for 8 by -1; $= changestr( copies(., e), $, e)
end /*r*/ /* [↑] append $ str to FEN*/
say /*display a blank sep. line*/
say 'FEN='fen "w - - 0 1" /*Forsyth─Edwards Notation.*/
return /* [↑] display chessboard.*/
/*──────────────────────────────────────────────────────────────────────────────────────*/
piece: parse arg x; if p//2 then upper x;
if CBs<0 & p>2 then if random(1) then upper x /*CBs>0? Use balanced.*/
/*[↓] # isn't changed.*/
do #=0 by 0; r= random(1, 8); f= random(1, 8)
if @.r.f\==. then iterate /*is position occupied?*/
if (x=='p' & r==1) | (x==
/*[↑] skip these pawns*/
if ux=='K' then do rr=r-1 for 3 /*[↓] neighbor ≡ king?*/
Line 1,718 ⟶ 1,720:
end /*rr*/ /*[↑] neighbor ≡ king?*/
end /*ff*/ /*[↑] we're all done. */
@.r.f=
!.r.f= ux; return
end /*#*/ /*#: isn't incremented.*/</lang>
Some older REXXes don't have a '''changestr''' BIF, so one is included here: ───► [[CHANGESTR.REX]]. <br><br>
| |||