Alphabetic Chess (ABC): The squares are considered in the order a1, a2…a8, b1…b8, c1 and so on to h8. At each turn, only the unit standing on the square which comes earliest in this order may move. However check and mate are normal.
Grasshopper (G): Moves along Q-lines over another unit of either color to the square immediately beyond that unit. A capture may be made on arrival, but the hurdle is not affected.
No.1315Roméo Bedoni & Sébastien Luce France original – 08.08.2018
White minimal / Black Grasshoppers of promotion will cooperate to create a jail all around black King.
White b7 Pawn mates at the end but is also used as an hurdle during the solution.
First achievement of eight promotions in Grasshopper in series movers. (Authors)
Moving bGg5 to f5 makes the solution one move longer, as follows:
1.a2-a1=G 2.Ga1-c3 3.a3-a2 4.a2-a1=G 5.b2-b1=G 6.Ga1-d4 7.Gb1-b4 8.b3-b2 9.b2-b1=G 10.Gb1-b5 11.Gb4-b6 12.Gb5-g5 13.Gb6-b8 14.Gb8-g3 15.c2-c1=G 16.Gc1-e3 17.Gc3-e5 18.d2-d1=G 19.Gd1-f3 20.Gd4-g4 21.e2-e1=G 22.Ge1-e4 b7-b8=G# (C?)
Geoff Foster
August 9, 2018 09:11
Please ignore my earlier comment. The position is legal and moving bPg5 to f5 leads to cooks!
LUCE
August 10, 2018 19:57
Julia, i am ont an American i am from France !
LUCE
August 10, 2018 19:58
and Romeo also
LUCE
August 10, 2018 20:33
Diag.1315 is one of the compositions of an article to be published in Phénix about records of promotion of the same fairy pièce in sh#n
Geoff Foster
August 11, 2018 13:22
A very nice problem. The difficult thing for composers is avoiding promotions to other pieces. Having a bGg5 is important, because it prevents cooks in which a black bishop moves to g5, a black knight moves to e3, and White mates with b8=Q.
Super achievement. Excellent !
Does the illegal position matter?
Moving bGg5 to f5 makes the solution one move longer, as follows:
1.a2-a1=G 2.Ga1-c3 3.a3-a2 4.a2-a1=G 5.b2-b1=G 6.Ga1-d4 7.Gb1-b4 8.b3-b2 9.b2-b1=G 10.Gb1-b5 11.Gb4-b6 12.Gb5-g5 13.Gb6-b8 14.Gb8-g3 15.c2-c1=G 16.Gc1-e3 17.Gc3-e5 18.d2-d1=G 19.Gd1-f3 20.Gd4-g4 21.e2-e1=G 22.Ge1-e4 b7-b8=G# (C?)
Please ignore my earlier comment. The position is legal and moving bPg5 to f5 leads to cooks!
Julia, i am ont an American i am from France !
and Romeo also
Diag.1315 is one of the compositions of an article to be published in Phénix about records of promotion of the same fairy pièce in sh#n
A very nice problem. The difficult thing for composers is avoiding promotions to other pieces. Having a bGg5 is important, because it prevents cooks in which a black bishop moves to g5, a black knight moves to e3, and White mates with b8=Q.