A single integer N = a complete chess game

[David W. Wilson]

Ralf Stephan [mailto:ralf at ark.in-berlin.de] wrote

> Stop! This should have read 176^400 and 900 digits for 400 half
> moves each having 176 possibilities.

In chess terminology, a "half move" is called a "play". A play by White
followed by a play by Black constitute a move.

Concerning 176: The largest known number of possible plays from a legal
position is 218:

R6R/3Q4/1Q4Q1/4Q3/2Q4Q/Q4Q2/pp1Q4/kBNN1KB1 w - - 0 1

(Petrovic, 1964).