Challenge No. 8
What is the shortest game leading to an A1.3 illegal position?


We don't know this yet, but we do know that the shortest game to non-stalemate death is no longer than 10 moves.

Noam Elkies found 1 e3 a5 2 Qh5 Ra6 3 Q:a5 h5 4 h4 aRh6 5 Q:c7 f6 6 Q:d7+ Kf7 7 Q:b7 Bf5 8 Q:b8 Bh7 9 Qb3+ Kg6 10 Qe6 Q:d2+, which is dead. This is based upon an known 9.5 move stalemate.
  a b c d e f g h  
 8   8 
 7   7 
 6   6 
 5   5 
 4   4 
 3   3 
 2   2 
 1   1 
  a b c d e f g h