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Ecumenical Chess. Set of Variants incorporating Camels and Camel compound pieces. (8x10, Cells: 80) [All Comments] [Add Comment or Rating]

H. G. Muller wrote on Thu, Jan 1, 2009 07:30 PM UTC:

A fortress draw originally meant a position from which you can prove that the weak side can hold out forever. This in contrast to drawn positions where the weak side draws by gaining a piece. The latter occur a lot in end-games like KFFWK, when the bare King can chase an F or W cut off from their allies into an edge or corner, after which the remaining KFFK or KFWK is a draw.

An example of a fortress in KQKBN is this:

. . . . . K Q .
. . . . . . . .
. . . . . . . .
. . . . . . . .
. . . n . . . .
. . . . . . . .
. b . . . . . .
k . . . . . . .

All black pieces are defended, and the white King cannot approach the bishop to attack it a second time. This fortress holds out even against an Amazon.