💡📝Larry Smith wrote on Sat, Oct 18, 2008 12:16 PM UTC:
It appears that Zillions may not be up to the task of presenting this game. Here's a simple position example to demonstrate:
White - Kg4, Qd7
Black - Ke4, Pd5
White King is defended by its Queen and Black's King by its Pawn. So neither King can attack the other. White King is able to take Black Pawn since it maintains its Queen as a defender but Black King cannot take White Queen because then it is open to White King's attack.
White could simply win by taking Black Pawn with White King. But what if White makes the following move: Q-a4?
At first glance, this appears to leave White King un-defended. But White Queen continues its purpose because the Black King will be in threat if it attempts to take the White King. And the King is not permitted to move into threat.
So, Black is also mated in this position.
Zillions has difficulty in 'seeing' this potential.