Generate random chess position: Difference between revisions
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<br>but not necessarily of the same kind). |
<br>but not necessarily of the same kind). |
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If the number of chessboard specified is negative, then the number of pieces for each |
If the number of chessboard specified is negative, then the number of pieces for each side will be randonm. |
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This version also allows any number of chessboards to be displayed. |
This version also allows any number of chessboards to be displayed. |
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<lang rexx>/*REXX pgm |
<lang rexx>/*REXX pgm gens a chess position (random pieces & positions) in a FEN format.*/ |
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parse arg seed CBs . /*obtain optional arguments from the CL*/ |
parse arg seed CBs . /*obtain optional arguments from the CL*/ |
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if seed\=='' & seed\="," then call random ,,seed /*RANDOM repeatability? */ |
if seed\=='' & seed\="," then call random ,,seed /*RANDOM repeatability? */ |
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else call piece substr('bnpqr', random(1, 5), 1) |
else call piece substr('bnpqr', random(1, 5), 1) |
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end /*p*/ /* [↑] place a piece. */ |
end /*p*/ /* [↑] place a piece. */ |
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call cb /*display the |
call cb /*display the ChessBoard and its FEN.*/ |
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end /*boards*/ |
end /*boards*/ /* [↑] CB ≡ ─ ─ */ |
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exit /*stick a fork in it, we're all done. */ |
exit /*stick a fork in it, we're all done. */ |
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/*────────────────────────────────────────────────────────────────────────────*/ |
/*────────────────────────────────────────────────────────────────────────────*/ |
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say /*a blank line (after the board).*/ |
say /*a blank line (after the board).*/ |
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say 'FEN='fen "w - - 0 1" /*show Forsyth-Edwards Notation.*/ |
say 'FEN='fen "w - - 0 1" /*show Forsyth-Edwards Notation.*/ |
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return /* [↑] build/display chessboard.*/ |
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return |
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/*────────────────────────────────────────────────────────────────────────────*/ |
/*────────────────────────────────────────────────────────────────────────────*/ |
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piece: parse arg x; if p//2 then upper x; arg ux /*use white if odd P.*/ |
piece: parse arg x; if p//2 then upper x; arg ux /*use white if odd P.*/ |
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if ux=='K' then do rr=r-1 for 3 /*[↓] neighbor≡king?*/ |
if ux=='K' then do rr=r-1 for 3 /*[↓] neighbor≡king?*/ |
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do ff=f-1 for 3; z=@.rr.ff /*obtain the neighbor*/ |
do ff=f-1 for 3; z=@.rr.ff /*obtain the neighbor*/ |
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upper z; if z=='K' then iterate # |
upper z; if z=='K' then iterate # |
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end /*rr*/ |
end /*rr*/ /*[↑] neighbor≡king?*/ |
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end /*ff*/ |
end /*ff*/ |
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@.r.f=x; return /*place random piece.*/ |
@.r.f=x; return /*place random piece.*/ |
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end /*#*/</lang> |
end /*#*/ /*#: not incremented.*/</lang> |
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Some older REXXes don't have a '''changestr''' BIF, so one is included here: ───► [[CHANGESTR.REX]]. <br><br> |
Some older REXXes don't have a '''changestr''' BIF, so one is included here: ───► [[CHANGESTR.REX]]. <br><br> |
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'''output''' showing five chess positions (starting with a specific position by seeding the random BIF with '''96'''), |
'''output''' showing five chess positions (starting with a specific position by seeding the '''random''' BIF with '''96'''), |
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<br>specifying the arguments (for Regina REXX under Windows): 96 5 |
<br>specifying the arguments (for Regina REXX under Windows): 96 5 |
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<pre> |
<pre> |
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