Torsten Linß Original Fairy problems JF-2020/I :
Definition:
Spiralspringer : Moves as Nightrider ((1,2) Rider – operates along straight lines with squares lying a Knight`s move away from each other ), but spirally along the orthogonal line – a1-c2-a3-c4-a5-c6-a7-c8 or a1-b3-c1- … -h3, and also via a1-b3-a5-b7 or a1-c2-e1-g2.
No.1504 Torsten Linß Germany original – 12.05.2020
Solution: (click to show/hide)
white kf5 pb7 qc7 rg3
black Kb5 sse5
s#13 (4+2)
1.b7-b8=Q + !
1...Kb5-a6
2.Qb8-a7 +{display-departure-file}
2...Ka6-b5
3.Qc7-b6 + {display-departure-file}
3...Kb5-c4
4.Qa7-a2 +
4...SSe5-b3
5.Kf5-f4
5...Kc4-d5
6.Rg3-g5 +
6...Kd5-c4 {
}
7.Qb6-c5 +
7...Kc4-d3
8.Rg5-g3 +
8...SSb3-f3
9.Kf4-g4
9...Kd3-e4
10.Qa2-b1 +
10...SSf3-d3
11.Kg4-h4
11...Ke4-f4 {
}
12.Qb1-b4 + {display-departure-file}
12...SSd3*b4
13.Qc5-f5 +
13...Kf4*f5 #
1...Kb5-a4
2.Qc7-a7 + {display-departure-file}
2...SSe5-a5
3.Qb8-e8 +
3...Ka4-b4
4.Qa7-b6 +
4...Kb4-c4
5.Qe8-g8 +
5...SSa5-f7 +
6.Kf5-g6
6...Kc4-d5 {
}
7.Rg3-g4
7...Kd5-e5
8.Qg8-e8 +
8...Ke5-d5
9.Qe8-c6 + {display-departure-file}
9...Kd5-e5
10.Qb6-b2 +
10...SSf7-d4 +
11.Kg6-h5
11...Ke5-f5 {
}
12.Qb2-b5 + {display-departure-file}
12...SSd4*b5
13.Qc6-f6 +
13...Kf5*f6 #
1...SSe5-b7
2.Rg3-g4
2...Kb5-a6
3.Qc7-c6 +
3...Ka6-a5
4.Qc6-a4 +
4...Ka5-b6
5.Rg4-g5
5...Kb6-c5
6.Kf5-g4 +
6...Kc5-b6 {
}
7.Rg5-g6 +
7...Kb6-c5
8.Qb8-c8 +
8...Kc5-d5
9.Qa4-c4 + {display-departure-file}
9...Kd5-e5
10.Qc8-b8 +
10...SSb7-d6 +
11.Kg4-h5
11...Ke5-f5 {
}
12.Qb8-b5 + {display-departure-file}
12...SSd6*b5
13.Qc4-f4 +
13...Kf5*f4 # {
(C+ by Popeye 4.37) }
Threefold "double-check" echo. (Author)
No.1504
Very spiralspringer-specific ideal mates in threefold echo. Fantastic achievement!