Switched to a bit more standard notation

nnfc.awk

@@ -4,7 +4,7 @@
 # [number][number] - move from column/freecell to column/freecell/foundation:
 # - 0 is foundation (can be omitted)
 # - 1 to 8 are column numbers
-# - 9 to 12 are freecell numbers
+# - a, b, c, d are freecell numbers
 # SEED variable can be used to init games M$-style
 # no supermove support for now, need to move cards one at a time
 # created by Luxferre in 2024, released into public domain
@@ -98,11 +98,20 @@ function domove(cmd, valid, nums, from, to, si) {
   }
   valid = 0 # invalid by default until all checks are done
   # if cmd is not q or one of the above, then it must be two numbers
-  # 1 to 8 is the column (tableau) number
-  # 9 to 12 are free cell indices, 0 means foundation
   split(cmd, nums, "") # numbers must be space-separated
-  from = int(nums[1]) # location from which we're moving
-  to = int(nums[2]) # location to which we're moving
+  from = nums[1] # location from which we're moving
+  to = nums[2] # location to which we're moving
+  # identify free cells
+  if(from == "a") from = 9
+  if(from == "b") from = 10
+  if(from == "c") from = 11
+  if(from == "d") from = 12
+  if(to == "a") to = 9
+  if(to == "b") to = 10
+  if(to == "c") to = 11
+  if(to == "d") to = 12
+  from = int(from)
+  to = int(to)
   rfrom = from - 1 # real from location
   rto = to - 1 # real to location
   if(from > 0 && from < 13 && to > -1 && to < 13) { # first check