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MatPlus.Net  Forum Competitions Announcement: British Chess Problem Society G CENTENARY TOURNEY |
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| | | (1) Posted by David Friedgood [Monday, Dec 2, 2013 15:57] | Announcement: British Chess Problem Society G CENTENARY TOURNEY
T. R. Dawson’s first grasshopper problem was published in 1913. To celebrate this centenary, the BCPS
announces a tourney featuring not only the contrahopper family, a group of pieces derived from the
grasshopper, but also the serieshelpmate, another (later) invention of Dawson’s.
Required are serieshelpmates of any length using one or more contrahoppers, which are fairy units derived
from the original grasshopper. Definitions and schematic examples appear below.
There are two sections. In Section 1 no other fairy forms are permitted, while in Section 2 any one
additional fairy form is required, i.e. either one fairy condition or one other type of fairy piece (more than one
unit of this type may be on the board) – but not both. Problems in more than one phase are allowed, whether
with set play, multiple solutions, twinning or some combination of those methods.
All entries must be tested by Alybadix, Popeye or WinChloe and the name of the testing program used must
be stated.
Judge: Chris Feather
Entries should be sent to the tourney controller Christopher Jones address: 11 Severn Grange, Ison Hill
Road, Bristol, BS10 7QA, UK or email: cjajones1@yahoo.co.uk by 31st January 2014.
Definitions: Whereas TRD’s grasshopper hops over a hurdle (any unit) at any distance away along its line,
and lands on the next square beyond, pieces in the contrahopper family reverse the relative hurdle positions:
their hurdle must be on the square which is nearest to them on their line, but they may land anywhere on the
line beyond the hurdle. As they are line-pieces (riders, in TRD’s terminology), they can be blocked by a further
unit on the line and they may pin such a unit.
Example 1
(Section 1)
 (= 4+3 )
Ser-H#10 ( = Contragrasshopper,  = Contranightriderhopper))
Set: 1.CNb4#;
1.e4 2.e3 3.exd2 4.d1=CG 5.d2 6.CGd3 7.d1=S 8.Sb2 9.Sc4 10.Se5 CNb4#
Example 2
(Section 2)
Added fairy element in this case: PWC
 (= 6+3 )
Ser-H#4 ( = Contranightriderhopper,  = Contrarookhopper))
PWC (Captured units reappear on the square vacated by the capturer)
1.Qc8 2.Qxc1[CRc8] 3.Qg5 4.Qd8 d6# (pinmate: 5.Bf7??)
Contragrasshopper:
Contrahops on queen-lines, so the hurdle must stand
at a distance of (0,1/1,0) or (1,1) away from it.
Contrarookhopper:
Contrahops on rook-lines, so the hurdle must stand
at a distance of (0,1/1,0) away from it.
Contrabishopper:
Contrahops on bishop-lines, so the hurdle must stand
at a distance of (1,1) away from it.
Contranightriderhopper:
Contrahops on night-rider-lines, so the hurdle must stand
at a distance of (1,2/2,1) away from it.
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