Promotions to Rook and Bishop Switchback by the white King Echo diagonal-orthogonal (WinChloe: At least 3 and 2/3 of the angles formed by the moves on the same level in two solutions/variations measure 45°) The white Grasshopper and the Black king exchange places in the mate position Minimal (DieSchwalbe: Apart from the king, the mating side has only one unit) There are no similar moves Model Mate
Definitions
Grasshopper: Moves in queen directions, but the penultimate square must be occupied by a piece (the "hurdle") which can be of either colour and is unaffected by the move.
Promotions to Rook and Bishop Switchback by the white King Echo diagonal-orthogonal (WinChloe: At least 3 and 2/3 of the angles formed by the moves on the same level in two solutions/variations measure 45°) The white Grasshopper and the Black king exchange places in the mate position Minimal (DieSchwalbe: Apart from the king, the mating side has only one unit) There are no similar moves Model Mate
Definitions
Grasshopper: Moves in queen directions, but the penultimate square must be occupied by a piece (the "hurdle") which can be of either colour and is unaffected by the move.
