Event = {Custom initial position (Black to play)}
+---+---+---+---+---+---+---+---+
| r | n | b | q | k |   |   | r |
+---+---+---+---+---+---+---+---+
| p | p | p | p |   | p | p | p |
+---+---+---+---+---+---+---+---+
|   |   |   |   |   | n |   |   |
+---+---+---+---+---+---+---+---+
|   |   | b |   | p |   |   |   |
+---+---+---+---+---+---+---+---+
|   |   | B |   | P |   |   |   |
+---+---+---+---+---+---+---+---+
|   |   |   |   |   | N |   |   |
+---+---+---+---+---+---+---+---+
| P | P | P | P |   | P | P | P |
+---+---+---+---+---+---+---+---+
| R | N | B | Q |   | R | K |   |
+---+---+---+---+---+---+---+---+
b kq -
Initial move number = {4}
[start]                 -+<LONG
[4b]                    (4b) O-O (#hm=1)
+---+---+---+---+---+---+---+---+
| r | n | b | q |   | r | k |   |
+---+---+---+---+---+---+---+---+
| p | p | p | p |   | p | p | p |
+---+---+---+---+---+---+---+---+
|   |   |   |   |   | n |   |   |
+---+---+---+---+---+---+---+---+
|   |   | b |   | p |   |   |   |
+---+---+---+---+---+---+---+---+
|   |   | B |   | P |   |   |   |
+---+---+---+---+---+---+---+---+
|   |   |   |   |   | N |   |   |
+---+---+---+---+---+---+---+---+
| P | P | P | P |   | P | P | P |
+---+---+---+---+---+---+---+---+
| R | N | B | Q |   | R | K |   |
+---+---+---+---+---+---+---+---+
w - -
{Line}{1 plies}