: to capture, you must be "observed" by a unit of your side at the beginning of the move
For example 1...b3 does not check the ♔e7 as the e1 is not "observed" by a black unit.
🨶h6, "observed" by 🨵h2, have a grip on f4, 🨵e8, "appuyée par le Roi blanc"observed" by white King,
control e6 & e5.
♚f5, not "observed", cannot capture g4 or g6.
: unit needing a hurdle to move
: move as a , but with the help of a hurdle on its way
{try :}
1.d2-d4 ? {(does not check, neither by the pd4, which is not "observed" by a friendly piece,
nor by the Rob5 for the same reasons, but threatens } 2.WRa2-g2 # {which "observe" pg4)}
1...b4-b3 2.c2-c4 # {(which "observe" Rob5)}
1...e4-e3 {or} 1...e4*d3 ep. 2.WRa2*a6 # {(possible because it is supported by RLh2;
it mates because it supports Bg6, without BLg1 being able to intercept on b6)Mais}
1...BBg1-b6 ! 2.WRa2-g2 + BRg3-g1 ! {}
1.c2-c4 ! {(same threat :} 2.RLa2-g2 # {)}
1...b4*c3 ep. {or} 1...b4-b3 2.WRa2*a6 # {"observing" Bg6, without RoLe1 being able to intercept on c6.}
1...e4-e3 2.d2-d4 # {by Rose-Lion b5
ABC-BCA cycle. Kiss thema, says autor.}
4 - h#2 3 solutions with hunter
Feather, Ch2015
white Kb1 Pg6b7d6 Bf7
black Sa5a8 Kh8 Pe4 Bf2f5 RRb3
h#2(5+7)b3: hunter Bishop/Rook
: on b3 is a Bishop-Rook hunter.
He plays like a Bishop in front of him and like a Rook behind him; horizontal moves are forbidden.
It therefore controls squares a2, c2, d1, b4, b5, b6 & b7.
This is not a recent idea: Hunters were first introduced in 1943 and generalised in 1950.
Cast :
(created by Petkov) a unit can only capture if it is not simultaneously attacking another opposing unit
: move on the Queen's lines with the help of a hurdle
{ }
a) {}
1...Ba3-c5 2.LIa6-d6 Kc6-d7 3.LId6-d2 + Bc5-f2 # !
{Bishop has parried the Lion's check by ensuring that he is attacked by the said Lion.
It's mate: the Black King can't take the f2 Bishop because he's also attacking the Be2.
Neither can Lion, as he is also attacking the white King.}
b) wPd5-->c5 {d5 --> c5}
1...Kc6-b6 2.LIa6-a2 Ba3-c1 3.LIa2-f2 + Bc1-d2 # !
{Echoing Mats.}
6 - serial h#6 2 sol cast reverse
Petkov, P.2020
white Kb6 Pf2 Qh2
black Pb7c2 Ka1
ser-h#6 cast reverse(3+3)2 solutions
Cast reverse :
a unit can capture only if it threatens at the same time another opposing unit.
{}
1.c2-c1=R {(} 2.Rc1-f1 ? 3.Rf1*f2 {illegal)}
2.Rc1-g1 ! 3.Rg1-g2 {black Rook attack the Queen and so can capture the pawn.} 4.Rg2*f2 5.Rf2-a2 6.Ra2-a7 ! Qh2-a2 #
{This is mate, because the Queen also attacks the Black Rook, which cannot escape..
And of course the said Rook cannot take the Queen because it is not attacking anyone else..}
1.c2-c1=B {(} 2.Bc1-e3 + ? {checks)}
2.Bc1-f4 ! 3.Bf4-g3 4.Bg3*f2 {(doesn't check)} 5.Bf2-d4 6.Bd4-h8 ! Qh2-b2 #
{the Bishop cannot leave the diagonal, which would prevent mate
Diagonal-orthogonal correspondence.}
7 - h#2 circe assassin b) ♔d6
Smits, G.2022
white Pb7 Kd1
black Kh8 Pg2h2
h#2 Circe assasin(2+3)b) ♔d6
: captured unit is reborn on its native square, even if it is not free
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