py_20220329

1 - 2# with nightriders

Dawson, TR.
1946

white Rh8d1 Pf2 Bg3 Kh2 Sa5a4 Qb4 black Nb1e2 Kc7 Sa8 Pe7e5f3a2 Be4b2 Ra1

#2(8+11)
🨨b1, e2: Nightriders

Extended knight

Solution

{

Tries :
} 1.Qb4*e7 + ? but 1...Nb1*e7 ! {
} 1.Qb4-b8 + ? but 1...Ne2*b8 ! {

} 1.Rd1-d8 ! {display-departure-file} {Blocus.
} 1...Be4-b7 {(or on the c2-h7 diagonal, or} 1...Nb1-d5 {or} 1...Ne2-c6 {)} 2.Qb4-b7 # {
} 1...Nb1-c3 {display-departure-file} {or} 1...Ne2-d4 {or} 1...Bb2-c1 {or} 1...Bb2-a3 2.Bg3*e5 # {
} 1...Nb1-d2 {or} 1...Nb1-a3 {or} 1...Bb2-c3 {or} 1...Be4-d5 2.Qb4*e7 # {
} 1...Ne2*g3 {or} 1...Ne2-f4 {or} 1...Ne2-g6 {or} 1...Ne2*h8 {or} 1...Ne2-b8 {or} 1...Ne2*a4 {or} 1...Ne2-c1 {or} 1...Ne2-g1 {or} 1...Bb2-d4 {or} 1...Be4-c6 2.Qb4-b8 # {
} 1...Sa8-b6 2.Qb4*b6 # {
} 1...e7-e6 2.Qb4-d6 # {
} 1...Ne2-c3 2.Bg3*e5 # 2.Qb4-b8 # {dual
}

2 - h#9 functionaries

Cefle, K.
2021

white Ra6 Ka1 black Kh1 Bh4 Sa8

h#9 functionaries(2+3)

A unit can only move if it is "observed" by an enemy unit

Solution

{

} 1.Sa8-c7 Ra6-a7 2.Sc7-b5 Ra7-b7 3.Sb5-d6 Rb7-b4 4.Bh4-e1 Rb4-e4 {

} 5.Be1-g3 Re4-d4 6.Sd6-f5 Rd4-d5 7.Sf5-e3 Rd5-e5 8.Se3-g2 Re5-e3 {

} 9.Bg3-h2 Re3-e1 # {

The solvers had a hard time, because of the other mate board with Rh4 and Bg1.}

3 - s#6 functionaries

Paradzinsky, O.
2021

white Rd5c1 Kb1 black Pc6c4 Kb3

s#6 functionaries(3+3)

Solution

{

} 1.Rd5-d2 ! zugzwang. 1...c4-c3 2.Rd2-a2 {(threatens} 3.Ra2-a1 c3-c2 # {)
} 2...c3-c2 + 3.Ra2*c2 zugzwang. 3...c6-c5 4.Rc2-a2 {Retour.} 4...c5-c4 {
} 5.Ra2-a4 {(Tempo)} 5...c4-c3 6.Ra4-a1 6...c3-c2 # {
note that after} 5.Ra2-a5 ? c4-c3 {,Rook a5 can't move no more !}

4 - h#2 3 solutions with kangaroos & nightrider

Trommler, S & Pachl F
2002

white WKa6e7 Ka4 Qf4 Pd3 black Sg6 Pg7a3g5h5f3 Bc4 Nb5 BKa2h4c5 Kh6 Rf5d1

h#2 (5+14)
🨴a6, e7, 🨺a2, h4, c5: Kangourou
🨨b5: Nightrider
3 solutions

moves on the Queen's lines with two sautoirs on the same line
The arrival square must be free or occupied by an opponent's piece

It is necessary to neutralize 3 animals (♜f5, ♝Fc4 & 🨨b5) likely to intercept the 6th row.
One of these animals will be hidden on the 8th and then intercepted on the f7 square by another, while the 3rd will be taken.

Solution

{

} 1.Rf5-f8 d3*c4 2.Nb5-f7 Qf4-d6 # {(to the "covered" by the Kga6, and } 3.Nf7*d6 {or} 3.Rd1*d6 {doesn't change anything)
Ng6 is pinned by the Queen, h7 is controlled by Kge7.

} 1.Bc4-g8 Ka4*b5 2.Rf5-f7 Qf4-f6 # {(} 3.Rf7*f6 {ou} 3.g7*f6 {doesn't change anything)

} 1.Nb5-h8 Qf4*f5 2.Bc4-f7 Qf5-e6 # {(} 3.Bf7*e6 {doesn't change anything)

This problem was quaified strangely. "Cheney-Loyd"? It is true that the hidden unit is no longer in use, but the King is not concerned ! "cyclic Grimshaw" ?
There is certainly an ABC-BCA-CAB cycle (stashed piece, captured piece, intercepting piece) but Grimshaw ?
I wonder what Uncle Walter would have thought.}

5 - s#8 imitating pieces

Caillaud, M.
2020

white Ka5 Ra6f5 Pb6e3e2a4 Bc7 Se7 white Royal Sd6 black Kc5 black Royal Bd5

s#8 (10+2)
d6, d5: imitating pieces

an imitating piece acquires the walk (in addition to its own) of the pieces (friendly or opponent) it "observes"

Solution

{

} 1.Ra6-a8 rBd5-e5 {(IBxf5 would be a self-check by INd6)} 2.Ra8-h8 ! {(2.Rg8 ? would stalemate)
} 2...rBe5-d5 3.Rh8-h1 rBd5-e5 4.Rh1-a1 rBe5-d5 5.Ra1-a2 rBd5-e5 {
} 6.Ra2-b2 rBe5-d5 7.rSd6-e4 + Kc5-c4 8.Rb2-b4 + rBd5*b4 # ! {, a6 being controlled by the black IB (which threatens Ne7).}

6 - h#2 take & make >anti take & make >neutres

Foster, G.
2013

neutral Pe2e7 white Kg3 black Kh1

h#2 T&M anti T&M(1+1+2)

After a capture the capturing piece pays posthumous homage to the captured piece by making a movement without capturing the march of the captured piece
In anti Take & Make, the captured piece pays homage to itself
Can be played by either side

Solution

{

} a) {
} 1.nPe2-e1=nS nPe7-e8=nR 2.nRe8*e1-f3[+nSd3] nRf3*d3-e1[+nSf2] # {

} b) nPe2-->a2 {e2 --> a2
} 1.nPa2-a1=nB nPe7-e8=nQ 2.nQe8-e5+ nBa1*e5-d5[+nQa1] # {

AUW}

7 - 2# Annan

Gockel, H.
2018

white Ra8e4 Ke8 Qe6 Sc4 Pe3c2 black Pb7c6b5 Sg6a4 Kb4 Rg4

#2 Annan(7+7)

a unit acquires the march of the friendly unit "under" it (to its south).
For example, Kb4 moves as a pawn as well as Re4

Solution

{

Essais :
} 1.Sc4-a3 ? {don't check, but threatens } 2.Qe6-a2 # {(the Knight moving as the Queen a2) ou} 2.Qe6-b3 # {but} 1...Rg4*e4 ! {pinning
} 1.Sc4-b2 ? {threatens} 2.Sb2-d3 # {(but not 2 Qb3 because the Queen would then take the Knight's march)} 1...Sg6-e5 ! {
but not } 1...Sa4*b2 ? 2.Qe6-b3 # {nor} 1...Sg6-f4 ? 2.e3*f4 # {

} 1.Sc4-e5 ! {No check : Re4 has the march of Pe3. The threat is} 2.Qe6-d4 # {, the Queen taking the Knight's Walk.
} {(} 1...Kb4-a3 {ou} 1...Kb4-c3 {illegal, le Roi noir empruntant la marche du pion b5.
} 1...Sg6*e5 2.Qe6-b3 # {
} 1...Rg4*e4 2.Se5-d3 # {
} 1...Sa4-b2 2.Qe6-c5 # {
} 1...Sa4-c5 2.Qe6*c5 # {and not} 2.Qe6-d4 + ? Sc5*d4 ! {or} 2...Sc5-c4 ! {.
} 1...Sa4-b6 2.Ra8-a4 # {and not} 2.Qe6-c5 + ? Sb6*c5 ! {nor} 2.Qe6-d4 + ? b5*d4 ! {.
} 1...c6-c5 2.Se5-d5 # {
}

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