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#1#2#3#4#5#6
Coordinate #5 is even * Serial # ends in even BNKRRQ
Serial # ends in odd BRKRRQ
Coordinate #5 is odd * Serial # ends in even KNQRQB
Serial # ends in odd KRKRQN

K: King, Q: Queen, R: Rook, B: Bishop, N: Knight.

* Add the coordinate’s letter (a–f = 1–6) and its number and see if the result is odd or even.