start$ = "RKR"
piece$ = "QNN"

for piece = 1 to len(piece$)
    pos = int(ran(len(start$) + 1)) + 1
    start$ = left$(start$, pos-1) + mid$(piece$, piece, 1) + right$(start$, len(start$) - pos + 1)
next
pos = int(ran(len(start$) + 1)) + 1
start$ = left$(start$, pos-1) + "B" + right$(start$, len(start$) - pos + 1)
pos = pos + 1 + 2 * int(int(ran(len(start$) - pos)) / 2)
start$ = left$(start$, pos-1) + "B" + right$(start$, len(start$) - pos + 1)
print start$