py_20200428

{

} 1.Rg2-g3 Rd3*g3[a4=rR] 2.Qe2-h5 Qb8-a7 {(doesn't check because the "Rook" a4 paralyses the black Queen)
} 3.Se4-c5 + {(discovery check)} b6*c5[a4=rS] # {
White King now has the moving way of a Knight and the Black Queen is unbridled
Et non} 3.Se4-c3 + ? Rg3*c3[a4=rS] + 4.rSa4*c3[f4=rR] ! {

} 1.Qe2-f3 {(doesn't check because paralysed by the Black Rook d3)
} Rd3*f3[a4=rQ] {(White King now has the moving way of a Queen)
} 2.Rg2-g1 {(tempo)} b6-b5 {(not check because paralysed by the Royal Queen a4)
} 3.Se4-d6 + {(discovery check)} Qb8*d6[a4=rS] # {: unblocking the b5 pawn because the White King now has the march of a Knight ;

(alternative solutions with paralysed King :
} 1.Ka4-b4 Qb8-a7 2.Qe2-f3 Rd3*f3[b4=rQ] 3.Se4-d6 + Rf3-b3 # {(paralysed King)
} 1.Rg2-g3 b6-b5 + 2.Qe2-h5 {paralize Pb5} Kf4*e4[a4=rS] 3.Qh5-e5 + Rd3-d5 # {de-paralyses the Pb5 (which paralyses while attacking the NKa4) by also paralysing the Qe5
} 1.Rg2-g3 Rd3*g3[a4=rR] 2.rRa4-a8 Rg3-a3 3.Qe2-g4 + Kf4*g4[a8=rQ] # {(paralysed King ))}

{

Tries :
} 1.LIh1-h4 + ? BLg5-d2 ! {ou} 1...BLg5-c1 ! {
} 1.LId1-d8 + ? BRe7-e2 ! {
} 1.WRa4-a6 + ? BLb6-f2 ! {(note that on } 1...BLb6-g1 ? {there is } 2.LIh1-f1 # {display-departure-file} {ou} 2.LId1-f1 # {display-departure-file} {)
} 1.WRa4-f4 ? {(threatening} 2.LIh1-h4 # {(A))
} 1...Se1-g2 2.LIh1*f3 # {
} 1...e3-e2 2.LId1-d8 # {(B)
but} 1...BRe7-e2 ! {parry the threat
} 1.LIh1-e4 ? {(threatening} 2.LId1-d8 # {(B))
} 1...e3-e2 {(allowing } 2...BRe7-e3 {)} 2.WRa4-a6 # {(C), BLb6 being immobilized
but} 1...BLg5-d2 ! {intercepts Lion d1

} 1.LId1-d4 ! {(threatening} 2.WRa4-a6 # {(C))
} 1...e3-e2 {(allowing } 2...BLb6-e3 {)} 2.LIh1-h4 # {(A) the BLg5 being immobilised
} 1...BRe7-e2 2.Sc4-e5 # {(protected by the Qe8.)

AB-BC-CA cycle.}

{

} a) {
} 1.Qf1*b5 Be3*c5 2.Kd5*c5 Bf7*e6 {=
Model stalemate.
The black King cannot play because the white Bishop would be reborn in c5, the Queen neither because the white Rook would be reborn in b5.

} b) -wBe3 +wRe3 {Re3
} 1.Qf1*f7 Re3*e6 2.Kd5*e6 Rb5*c5 {=
the Black King cannot play because the White Rook would be reborn in e6, the Queen neither because the White Bishop would be reborn in f7}

{

} 1.Qf7-g6 ! {(menace } 2.Qg6*e4 # {: the bQ plays again like a Queen but is pinned by the Bf2)
From now on Pg7 plays like a Queen and controls therefore e5

} 1...Bg8*d5 2.Sc5-a6 # {: the bK plays like an B but the Na6 like a R and therefore controls b6
} 1...Sc7*d5 2.Sc5-a4 # {: the bK plays like a N but the Ra5 also like a N and therefore controls b3 & c6 ;
. and the wK, playing like a Knight, control c2
} 1...Rb7*d5 2.Sc5*e4 # {: the bK plays like a R but the Pe5 like a N and therefore controls d3; and d1 is controlled by the Pf3.
. The Rd5, playing as a pawn, cannot parry the check.
} 1...Kd4*d5 2.Sc5*b7 # { : the bK plays like a P but d4 is controlled and the Nb7, playing like an B, mates it.
Et non} 2.Qg6*e4 + ? {(double check, because the e5-pawn is "promoted" to Queen)} 2...Qe3*e4 ! {
: the Black Queen has become a real Queen again, is unpinned and gives back to Pe5 his identity of pawn !

Half rose of the White Knight.}

{

} 1.nPf2-f1=nQ 2.nPg2*f1=nS[+nQd1] 3.nSf1-g3 4.nSg3-h5 nQd1*h5[+nSg8] # {

} 1.nPg2-g1=nB 2.nPf2*g1=nR[+nBc1] 3.nRg1-g5 4.f4-f3 nBc1*g5[+nRh8] # {

double checkmate.
AUW.}

{

} 1.kQd7*c7[-c7] kBd5*b7[-b7] 2.kRg5*b5[-b5] kSd6*c4[-c4] # {

} 1.kQd7*b5[-b5] kSd6*b7[-b7] 2.kBf4*c7[-c7] kBd5*c4[-c4] # {

Corridor mats with pinning.}

{

} 1.Bd4-a1 {!! This position, White to move, must be legal.
Obviously, the last move was ...Kb2xXb1, but then the last moves must have been ...Na3xBb1, Rc1xNb1+ (+bBa1) ...Kb2xRb1.
. So there is a white rook "under the belly" of the Black King.
} 2.Ba1-d4[+wRe4] {The "parrain" allows the rebirth of a wRe4.
} 3.Bd4-a1 ! { Again, this position can only be obtained if the last move was ...Kb2xRb1.
. So there is again a wR "under the belly" of the bK and the rest is} 4.Re4-h4[+wRe1] ! {
For the third time, the last move must have been ...Kb2xRb1).
D'où} 5.Kd1-d2[+wRb2] # {
the double check was not necessary but the a2 guard was!

"Renaissance" of 3 white Rooks.
Correction and improvement of a 1991 problem.
There should not be many serial problems starting with 1.Bd4-a1, 2 Ba1-d4 and 3 Bd4-a1!
Without the Pc2, the last moves could also have been ...Ka3xBb2, Bc2-b1+ (+wBa1) Kb2xBb1.}

{

} 1.Qa7-a5 ! {

} 1...Ra8*a5 2.Kf2-g3 zugzwang. 2...Ra5-h5 3.Kg3-g4 zugzwang. 3...Rh5-a5 4.Se6-g5 4...Ra5*g5 # {

} 1...Ra8-d8 2.Bf4-e3 zugzwang. 2...Rd8-d1 3.Kf2*e2 zugzwang. 3...Rd1-d8 4.Qa5-d2 4...Rd8*d2 # {

Echo.
A "diabolical" problem, one reads in a French magazine at the time.}