py_20241029

1 - 2# anti-circe

Cheylan, Y.
1992

white Rg1c7 Bb1f4 Qc2 Pd2e3f2f7e6 Kf6 Se1 black Bg3a2 Re8a3 Pg2g6b2d5b7 Sh4f5 Qa7 Kd4

#2 anti circe(12+13)

: after a capture, the capturing piece returns to its native square.
If this square is not empty, the capture is impossible..
There is one exception, however, when the capture and rebirth squares are the same. :
Calvet type authorised capture and Cheylan type illegal capture
Here, the question doesn't arise

Solution

{

} 1.Se1-f3 ! {(threatens} 2.Kf6-e5 # {)
} 1...Re8*e6[bRe6->a8] {or} 1...Re8-a8 2.Qc2-d3 # {: no Rxd3
} 1...Re8-e7 2.Qc2-e4 # {: no dxe4
} 1...Re8-b8 2.d2-d3 # {: no Nxe3
} 1...Re8-c8 2.Qc2-c4 # {: no Bxc4 (nor, of course, dxc4)
} 1...Re8-d8 2.Qc2-c5 # {: no Qxc5
} 1...Re8-f8 2.Bf4-e5 # {: no Bxe5
} 1...Re8-g8 2.Rg1*g2[wRg2->h1] # {: no Nxf3
} 1...Re8-h8 2.Qc2-c3 # {: no Rxc3 !
}

2 - 2# with set play and kamikaze pieces

Joffart, D.
1973

white Sg2d8 Pf3e3b3 Kb1 Rc2h5 Ba7 white Kamikaze Ba3 Sb5 Rh6 black Pe5d2c7 Sc1 Kd5 black Kamikaze Ra4e2 Sc5 Qg6

#2(12+9)
a3: kamikaze Bishop
b5, c5: kamikaze Knights
h6, a4, e2: kamikaze Rooks
g6: kamikaze Queen

: A kamikaze unit that captures disappears at the same time as the captured one

Solution

{

set play :
} 1...kQg6*c2[-c2] 2.kSb5-c3 # {
} 1...kSc5-e4 2.Sg2-f4 # {
} 1...kRa4-e4 2.Rc2*c5 # {
} 1...kQg6-e4 2.kSb5-c3 # {

Real play :
} 1.e3-e4 + ! {
} 1...kRe2*e4[-e4] 2.Sg2-e3 # {
} 1...kRa4*e4[-e4] 2.Sg2-f4 # {
} 1...kSc5*e4[-e4] 2.kSb5-c3 # {
} 1...kQg6*e4[-e4] 2.Rc2*c5 # {

ABC-CAB cycle between set play and real play .}

3 - h#3.5 chinese pieces

Rehm, HP & Widlert K
2018

white VAa6 Ka1 WPd1 black Sc4g2 MAd3 Be2 Rf2 BPh1 Ph2b3 Kf1

h#3.5(10+12)
🨼a6: Vao
🨋d1, 🨑h1: Pao
🨓d3: Mao

: move as a Rook but needs a hurdle to capture
: move as a Bishop but needs a hurdle to capture
: creeping Knight making first a Rook step.
If square of Rook step is not free, the Mao cannot then perform his bishop step.

Solution

{

} 1...WPd1-e1 2.Be2-d1 {
} WPe1-e2 {(unpinning Mao)} 3.MAd3-e1 {
} WPe2-d2 + 4.Bd1-e2 {(return)
} WPd2-d1 # {(return)

Mao can't move, d1 & e2 squares being busy.
And Be2 is pinned by Vao a6.
White Pao circuit.
The mate position is the diagram with Mao d3 on e1 .
Note that } 1...WPd1-d2 ? {is illegal : pin by Pao h1) } 2.BPh1*a1 {

Another under-rated problem .}

4 - serial h=8 anti-circe

Ersek, T.
2018

white Rb8e3 Bc6e1 Pf6h6h2b4 Qg3 Sd1 Ka1 black Sf7e7 Bd8 Pg7h7g2c2d2e2 Kg1

ser-h=8 anti circe(11+10)

Solution

{

} 1.c2*d1=S[-d1][+bSg8] 2.d2-d1=Q ! {(...d1R? would check)
} 3.Qd1-d7 4.Kg1*h2[-h2][+bKe8] 5.g2-g1=R ! {(5...g1B? 6...Bf2 7...Bxe1 (bBf8) and we can't get rid of Pe2 )
} 6.Rg1*e1[-e1][+bRh8] 7.e2-e1=B {
} 8.Be1*b4[-b4][+bBf8] Qg3-g6 {stalemate.

AUW.
stalemate by quadruple pinning .}

5 - 2# influencer

Gockel, H.
2022

white Pc7d7c6e6c4 Re7d3 Kg7 Se5g4 Be3h1 black Ra7 Kf5 Bb3

#2 influencer(12+3)

Influencer : when an opposing unit occupies a square adjacent to mine, I become a pawn,
unless I'm in the first or last row, in which case I adopt the walk of the influencing unit.
Influence persists when the influencer has moved away.
Kings are neither influencers nor influenced.

Solution

{

Tries :
} 1.Rd3-d4 ? {(threatens} 2.Bh1-e4 # {)
} 1...Bb3*c4[d4=P] ? 2.Sg4-h6 # {
but} 1...Bb3-c2 ! {
} 1.Rd3-d5 ? {(threatens} 2.Sg4-h6 # {)
} 1...Bb3*c4[d5=P] ? 2.Re7-f7 # {
but} 1...Bb3-d1 ! {and if } 2.Sg4-h6 + {, then} Bd1-h5[h6=P] ! {

} 1.d7-d8=S ! {(threatens} 2.Re7-f7 # {)
} 1...Bb3*c4[d3=P] 2.Bh1-e4 # {
It's really mate because even if you take the neighbouring pawn} 2...Bc4*d3[e4=P] {you can't take back check
Note that} 2.Re7-f7 + {is not mate because of } 2...Bc4*e6[f7=P][e5=P] {
} 1...Ra7*c7[c6=P][d8=R] 2.Rd8-f8 # {(2...Rxe7 does not prevent, Rf8 remains a Rook)} {

AB-BC-CA cycle on threat and variation.}

6 - last move ? a)isardam b)vogtländer c)patrol d)mars circe

Loerinc, J.
2007

white Sb4g1 Kc3 Qa8 Bg8 Pg2 black Sa5e1 Ka1 Pc5 Bh8 Qg5 Rh1

last move ?(11+10)
a)isardam
b)vogtländer
c)patrol
d)mars circe

: it is illegal for two opposing units of the same type to be in mutual ‘observation’
: a side is in check if he gives check in the traditional sense.
In other words, if he can't avoid giving check, he's mate! (Yes, I know, it's a bit of a brain teaser).
: A unit can only capture if it is ‘observed’ by a friendly unit.
: To capture, a unit virtually passes through its original square which must be free

Isardam solution

vogtlander solution

black Se1a5 Rh1 Ka1 Qg5 Pc5 Bh8 white Pg7g2 Sg1b4 Kc3 Qa8

{

the last move was} 1.g7-g8=B # {(otherwise Black not to move would be in check).

patrol solution

white Bg8 Sg1b4 Pg2 Kc3 Qa8 black Ph2c5 Se1a5 Ka1 Qg5 Bh8

{

the last move was} 1.h2-h1=R + {(supporting Bh8)}

mars circe solution

white Sb4g1 Kc3 Bg8 Pa7g2 black Sa5e1 Ka1 Pc5 Bh8 Qg5 Rh1

{

the last move was} 1.a7-a8=Q + {(how else could bK be in check?).

AUW.

Amusingly, the position is illegal in normal chess}

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