py_20260428

1 - h#3 with maos and lion

Henrych, M.
2024

white MAe3c6 LIe5 Kc1 black Ra8 Qf7 Ke8

h#3(4+3)
b) Nc6
🨍e3, c6: Mao
🨴e5: Lion

: Creeping knight that first moves one Rook step, then one Bishop step
: Moves on Queen's lines using a jump

Solution

{

} a) {
} 1.Qf7-c7 MAe3-c4 2.0-0-0 MAc4-d6 + {(If the Mao had moved to f5, this move could not be played)
} 3.Qc7-d7 MAc6-a7 # {(The d6 Mao does not deliver check but pins the d7 queen)

} b) +wSc6 {Nc6
} 1.Ke8-f8 MAe3-g4 2.Kf8-g8 MAg4-f6 {(If mao had moved to d5, that move would be illegal)
} 3.Ra8-f8 Sc6-e7 # {(The f6 Mao does not deliver check, but pins the Qf7)

Echo mates.
True and false castles.}

2 - h#2,5 Phantom and swapping Kings

Foster, G.
2017

neutral ph7 black Kd4 white Ke7

h#2.5 Phantom swapping Kings(1+1+1)
b) h7-->g2

: a unit may also move from its starting square (according to the Circe rules)
: The Kings swap places when they are in check.

Solution

{

} a) {
} 1...Ke7-d8 2.Kd4-d3 nPh7-h8=nQ[+bKd8][+wKd3] + {(The neutral Queen check from d1, so wKd3/bKd8)
The author points out that this is not a self-check, which would be illegal, as one must consider the position after the swap.
} 3.nQh8-a1 Kd3-c2[+wKd8][+bKc2] # {(The Black King is facing two Queens : a1 & d1 !)

} b) nPh7-->g2 {h7-->g2
} 1...Ke7-d7 2.nPg2-g1=nQ[+wKd4][+bKd7] + Kd4-d3 3.Kd7-d8 Kd3-e2[+wKd8][+bKe2] # {
The Black King is facing two Queens : d1 & g1

Echoes mates with a single Queen.
The moves Kd3 and Kd8 are not redundant, as they are made by different Kings !}

3 - serial help-stalemate 5 moves annan

Lytton, C.
2021

white Qd6 Pd4 Kc4 black Bf5 Sd5 Ke3

ser-h=5 Annan(3+3)
b) Kc4-->b5

: A unit acquires the movement of the friendly unit located ‘below’ it (to its south).

Solution

{

} a) {
} 1.Sd5-f4 2.Sf4-g3 {(moving as a Bishop)} 3.Bf5-e4 4.Ke3-g1 5.Be4-g2 Qd6*g3 {stalemate
Black King moves as a bishop, and the squares d4, e3, f2 and h2 are under control.

} b) wKc4-->b5 {Kc4-->b5
} 1.Sd5-f6 2.Bf5*d4 {((moving as a Knight)} 3.Sf6-e4 4.Ke3-d1 5.Se4-d2 Qd6*d4 {stalemate
: Black King moves like a Knight, and the squares b2, c3, e3 and f2 are under control
}

4 - 2# ultra-patrol with nightriders

Barth, M & Gockel H
2018

black Ke3 BNb7a8 Rg8g6 Pg5f5e5d4c6c7 white Kd1 Sb2h3 Bc5 Re7 WNg7 Pc4d3e2g2

#2(10+11)
🨢g7, 🨨a8, b7: Nightriders

: A unit must be observed by a friendly unit in order to make any move.
Re7 is covered by Bc5, which is covered by Ng7, which is covered by Re7.
But none of these pieces can deliver a check.
: Extended Knight with successive jumps

Solution

{

} 1.Bc5*d4 ? {(threatens} 2.WNg7*f5 # {mating by the Bishop covered by Nf5)
} 1...BNa8*c4 2.Sb2*c4 # {(covered by Bd4)
but} 1...c6-c5 ! 2.WNg7*f5 + c5*d4 {covered by Nb7
} 1.WNg7*f5 ? {(threatens} 2.Re7*e5 # {wich covers Nf5)
} 1...Rg6-e6 {(interposition)} 2.Re7-f7 # ! {
but} 1...Rg8-b8 ! {covers Nb7 and allows on} 2.Re7*e5 + {to play} 2...BNb7*f5 ! {

} 1.Re7*e5 ! {(threatens} 2.Bc5*d4 # {mate by the Rook)
} 1...BNa8*c4 {("observes" black Knight, which would make it possible on} 2.Bc5*d4 + {to counter with } 2...Ke3*d4 {)
} 2.Bc5-d6 # {(Pd6 is no longer supported, so cxd6 is no longer possible)
} 1...f5-f4 2.Bc5-f8 # {(mate by Ng7)
}

5 - PJ 4,5 b) Nb8 on g8 boléro

: Moves capturing are played as normal.
A piece that does not capture takes the move of the piece that was originally on the same column.
Pawns, which are not pieces, move as usual.

Solution

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