py_20230516

{

} 1.Kh6-g7 ? Sc7-e6 + ! 2.Kg7*g8[+bBc8] Bc8-d7 + ! {
} 1.Se4*g5[+bPg7] {?? illegal
} 1.Se4*f2[+bRh8] {?? illegal

} 1.Se4-f6 ! {(here, the answer } 1...Bg8-e6 ? {would lead to a short mate :} 2.Bf3-g2 + ! Rf2*g2[+wBf1] 3.Bf1*g2[+bRa8] # {
and} 1...Rf2*f3[+wBf1] {is illegal)
} 1...Rf2-f1 ! 2.Sf6-g4 ! {(2. Bg2+ ?? Kxg2 : no rebirth)
(on 2...Be6 ? 3.Nf2# because ...Rxf2 would rebirth the knight on g1)
or } 2...g5*f4[+wPf2] 3.e3*f4[+bPf7] Sc7-d5 {or} 3...Bg8-h7 4.Sg4-e3 {followed by} 5.Bf3-g4# {or} 5.Bf3-g2# {)
} 2...Rf1-f2 ! 3.Sg4-e5 Rf2-f1 4.Se5*d3[+bPd7] {
(} 4...g5*f4[+wPf2] ? 5.Sd3*f4[+bPf7] # {)
} 4...Rf1-f2 5.Sd3-e5 Rf2-f1 6.Se5-g4 Rf1-f2 {
} 7.Sg4-f6 Rf2-f1 8.Sf6-e4 Rf1-f2 {
Diagram with Pd3 on d7, enclosing the future bBc8.
} 9.Kh6-g7 ! {(threatens} 10.Se4*g5 #)} Sc7-e6 + 10.Kg7*g8[+bBc8] d7-d5 11.Se4*g5[+bPg7] # {

A foreplan of 8 moves.
(Note that : } 9...Sc7-e8 + 10.Kg7-h8 {)}

{

} 1.Sb1-c3 {
} 2.BGc1-f4 {(jumper g5)
} 3.Rh4-h2 {
} 4.Rh2-e2 {
} 5.Na6-c1 {(via g7-e8)
} 6.Sc3*d5 {
} 7.g5*f6 {double stalemate.

Nc1 pins Bf7 via b7-a5-h3-g1, as well as the Grasshoppers d3 & d7.
It is itself pinned by Rc7, which is pinned by Gf4 (d6 jump).
This one is pinned by Ge4 (b4 jumper).
Gd3 pins Re2 (b5 jump), Bf7 pins Rb3.
Re2 pins Ge4 & Be1.

6-unit pinning cycle :
Nc1-Gd3-Re2-Ge4-Gf4-Rc7-Nc1.}

{

} a) {
} 1.d2-c3 ! {display-departure-square} d7-d5 {display-departure-square} {
} 2.Ke1-d2 c7-f4 {(could not be played earlier because Pd7 would have prevented Kd2)
} 3.Kd2-d4 Qd8-d6 # {
(Pd5 has become Queen).

} b) {
} 1.d2-e3 ! {display-departure-square} d7-d3 {display-departure-square} {(wQ will have to be intercepted)
} 2.Ke1-d2 Bc8-e6 3.Kd2-c3 Be6-e5 # {
wK, now as a pawn, cannot move to b4 ;
and c4 is controlled by Pf7 !
Without Pe3, we would parry by Pf2-d4!}

{

} 1.Rd2-d5 + ? 1...Ge7-e4[-e5][+bKe3] ! 2.Ge4-e2[-e3][+bKa3] + Ka3*b2 ! {
but not} 1...Ke5-e6 ? 2.Ge7-e5[-e6][+bKc4] # {

} 1.Ra1-a2 ! {(Threatens} 2.Ge7-e4[-e5][+bKa1] # {, nBG looking at b1.)
} 1...Ke5-e4 2.Ge7-e3[-e4][+bKa8] # {
And not} 2.Ge7-e3[-e4][+bKb1] {because the side playing decides which of the two moves is to be made.
} 1...Ge7-c7[-d7][+bPg7] 2.Gc7-f4[-e5][+bKh8] # {(} 2...Gf4*f8 ? {is illegal, jumper f7 cannot be moved.)
} 1...Ge7-g7[-f7][+bPc7] 2.Gg7-d4[-e5][+bKb8] # {(} 2...Gd4-d8 ? {illegal.)
} 1...Ge7-e4[-e5][+bKe3] 2.Ge4-e2[-e3][+bKa3] # {(and not} 2.Ge4-e2[-e3][+bKc1] {: same remark).}