###Output:

###How it Works: Here's the program used to generate it:

Output:

How it Works:

Here's the program used to generate it:

SELECT., 8844 bytes

(9,9,50)EXP.SELECT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.EXP.RIGHT.RIGHT.SELECT.LEFT.LEFT.EXP.RIGHT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.SELECT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.RIGHT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOOP.RIGHT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.CONJ.RIGHT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.SELECT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.RIGHT.EXP.SELECT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.EXP.RIGHT.RIGHT.SELECT.LEFT.LEFT.EXP.RIGHT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.SELECT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.RIGHT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.LEFT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOOP.RIGHT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.CONJ.RIGHT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.EXP.L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

init(9,9,50) loop("rows",-4,3,1,True) var("i") go(1) loop("cols",-4,3,1,True,['i']) go(1) fetch("i") add(-1) go(1) makeneg1() exptarget(-1) go(1) ifnonpositive("drawtest") # j i k^i k^j i+j ((-1)^(i+j)) go(1) makei() # j i k^i k^j i+j (-1)^(i+j) 1/2 (I) multiply(-6) # j i k^i k^j i+j (-1)^(i+j) 1/2 i (I*i) add(-8) # j i k^i k^j i+j (-1)^(i+j) 1/2 i I*i k^(I*i) k^j (j+i*I) output() endif("drawtest") go(1) endloop("cols",savelist=['i']) go(1) endloop("rows") writetofile("chessboard3") 

SELECT., 8844 8278 bytes

(9,9,50)EXP.SELECT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.LEFT.LEFT.EXP.SELECT.EXP.RIGHT.SELECT.LOG.LEFT.SELECT.EXP.RIGHT.SELECT.RIGHT.EXP.SELECT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.EXP.SELECT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.EXP.RIGHT.RIGHT.SELECT.LEFT.LEFT.EXP.RIGHT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.RIGHT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOOP.RIGHT.RIGHT.EXP.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.CONJ.RIGHT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.EXP.SELECT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.LEFT.EXP.SELECT.RIGHT.LOG.LEFT.SELECT.EXP.RIGHT.SELECT.RIGHT.EXP.SELECT.EXP.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.LEFT.SELECT.RIGHT.RIGHT.RIGHT.EXP.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOOP.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.RIGHT.LOG.SELECT.LOG.RIGHT.SELECT.LEFT.LEFT.END.RIGHT.RIGHT.LOG.SELECT.LOG.RIGHT.SELECT.LEFT.EXP.LEFT.SELECT.RIGHT.LOOP.RIGHT.EXP.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.LEFT.RIGHT.RIGHT.RIGHT.END.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.EXP.LEFT.LEFT.SELECT.RIGHT.RIGHT.EXP.LEFT.SELECT.RIGHT.LOG.RIGHT.SELECT.LEFT.LOG.RIGHT.SELECT.EXP.LEFT.SELECT.RIGHT.EXP.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.LEFT.SELECT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.RIGHT.LOG.RIGHT.SELECT.EXP.LEFT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

init(9,9,50) makenum(8) square() dec() loop("main",computei=True) go(1) makenum(8) go(1) copyfrom(-2) intdiv(-1) add(-5) # n%8 blah blah blah blah n//8 k^(n//8) k^(n%8) (n//8+n%8) go(1) makeneg1() exptarget(-1) go(1) ifnonpositive("drawtest") go(1) makenum(-4,-4)  # n%8 blah blah blah blah n//8 k^(n//8) k^(n%8) n//8+n%8 (-1)^(n//8+n%8) 4 1/2 I k^(-4I) -1 (-4-4I) go(1) multiply(-4,-11)  # n%8 blah blah blah blah n//8 k^(n//8) k^(n%8) n//8+n%8 (-1)^(n//8+n%8) 4 1/2 I k^(-4I) -1 -4-4I (nI//8) add(-16)  # n%8 blah blah blah blah n//8 k^(n//8) k^(n%8) n//8+n%8 (-1)^(n//8+n%8) 4 1/2 I k^(-4I) -1 -4-4I nI//8 k^(nI//8) k^(n%8) (n%8+nI//8) add(-4)  # n%8 blah blah blah blah n//8 (-1)^(n%8) 4 1/2 I k^(-4I) -1 -4-4I nI//8 k^(nI//8) k^(n%8) n%8+nI//8 k^(n%8+nI//8) k^(-4-4I) ((n%8-4)+I(n//8-4)) output() endif("drawtest") go(1) endloop("main") writetofile("chessboard4") 

In other words, loop n from 0 to 63, drawing a square at (n%8-4) + (n//8-4)i if (-1)^(n//8 + n%8) is not positive.