June 2018 Update

Task/Generate-Chess960-starting-position/Julia/generate-chess960-starting-position.julia

@@ -1,30 +1,30 @@
-# placeholder knights
-rank1 = ['♘', '♘', '♘', '♘', '♘', '♘', '♘', '♘']
+function generateposition()
+    # Placeholder knights
+    rank = ['♘', '♘', '♘', '♘', '♘', '♘', '♘', '♘']
+    lrank = length(rank)
 
-# function to check if a space is available
-isfree(x::Int) = rank1[x] == '♘'
+    # Check if a space is available
+    isfree(x::Int) = rank[x] == '♘'
 
-# place king
-king = rand(2:7)
-rank1[king] = '♔'
+    # Place the King
+    rank[indking = rand(2:lrank-1)] = '♔'
 
-# place rooks
-rook1 = rand(filter(isfree, 1:8))
-rank1[rook1] = '♖'
+    # Place rooks
+    rank[indrook = rand(filter(isfree, 1:lrank))] = '♖'
+    if indrook > indking
+        rank[rand(filter(isfree, 1:indking-1))] = '♖'
+    else
+        rank[rand(filter(isfree, indking+1:lrank))] = '♖'
+    end
 
-if rook1 > king
-    rank1[rand(filter(x -> isfree(x) && x < king, 1:8))] = '♖'
-else
-    rank1[rand(filter(x -> isfree(x) && x > king, 1:8))] = '♖'
+    # Place bishops
+    rank[indbish = rand(filter(isfree, 1:8))] = '♗'
+    pbish = filter(iseven(indbish) ? isodd : iseven, 1:lrank)
+    rank[rand(filter(isfree, pbish))] = '♗'
+
+    # Place queen
+    rank[rand(filter(isfree, 1:lrank))] = '♕'
+    return rank
 end
 
-# place bishops
-bishop1 = rand(filter(isfree, 1:8))
-rank1[bishop1] = '♗'
-rank1[rand(filter(x -> isfree(x) && iseven(x) != iseven(bishop1), 1:8))] = '♗'
-
-# place queen
-rank1[rand(filter(isfree, 1:8))] = '♕'
-
-# print first rank
-println(join(rank1))
+@show generateposition()