- 21 Apr '05 23:46The usual definition of a forced mate is one in which no matter what one player does, the other can ensure checkmate by optimal play.

But can you think of a position in which no matter what the players do, checkmate within a certain number of moves is completely unavoidable? A more difficult challenge is to think of a position with such a forced mate, but one in which the mate may take several moves to occur. How many moves away from the inevitable mate can you manage? - 22 Apr '05 00:17
*Originally posted by Acolyte***The usual definition of a forced mate is one in which no matter what one player does, the other can ensure checkmate by optimal play.**

But can you think of a position in which no matter what the players do, checkmate within a certain number of moves is completely unavoidable? A more difficult challenge is to think of a position with such a forced mate, bu ...[text shortened]... e may take several moves to occur. How many moves away from the inevitable mate can you manage?

OK this is my best effort.

White has 2 black bishops as he has "queened" one of his pawns into a bishop (bishoped?) I think the position is legal.

With white to move, it's inevtiable that he can only move his pawn, which will reach the 8th rank in 6 moves, before the black king can take it. No other pieces can move.

Of course, this only works providing white doesn't turn his pawn into another bishop or a knight!!! - 22 Apr '05 01:55

My best effort is here:*Originally posted by Acolyte***The usual definition of a forced mate is one in which no matter what one player does, the other can ensure checkmate by optimal play.**

But can you think of a position in which no matter what the players do, checkmate within a certain number of moves is completely unavoidable? A more difficult challenge is to think of a position with such a forced mate, bu ...[text shortened]... e may take several moves to occur. How many moves away from the inevitable mate can you manage?

http://www.redhotpawn.com/board/showthread.php?threadid=22215&page=2

...although it involves lots of promoted force!

Noam Elkies has done a mate in 10 (!):

http://www.xs4all.nl/~timkr/chess2/diary.htm

Item 267.