py_20200331

{

} 1.Be3-f2 Bd7-c6 2.Rh5-h4 + LIe7*h4 # {
(forced, because the black King is "pinned" by the white Bishop (...Kb2 & ...Kd2 impossible).
The Lion captures the white rook from his presumed promotion square, e1. And then, he watches from h1.
The White King is "pinned" by Rc2 (Kb8 & Ka7 impossible).
As for b7, it is doubly controlled: by the Bc6 --since c8-- and the Lion h4.

} 1.Be3-d2 Bd7-a4 2.Rh5-a5 + LIe7*a5 # {
The Lion captures from e1 and mate from a1.
This time it is a7 which is doubly controlled.}

{

} 1...c7*b8=Q[wQb8->d1] 2.e2*f1=Q[bQf1->d8] Qd1*d8[wQd8->d1] {pat
(} 2.e2*f1=S[wSf1->g8] ? {and here, Qxg8 is impossible because there is no rebirth in d1 ;
. and 2 Kxg8 forbidden by the Black King who can capture in e1 and be reborn in e8)
} 1...c7*b8=R[wRb8->a1] 2.e2*f1=R[bRf1->a8] Ra1*a8[wRa8->h1] {stalemate
(} 2.e2*f1=S[wSf1->g8] ? Qg6*g8[wQg8->d1] + 3.Kf2-e3 ! {: 3 Rxe3 impossible because no rebirth in a1)
} 1...c7*b8=B[wBb8->c1] 2.e2*f1=B[bBf1->c8] Rc3*c8[wRc8->h1] {pat
(} 2.e2*f1=S[wSf1->g8] ? Qg6*g8[wQg8->d1] 3.Kf2-g3 ! {: 3 Bxg3 impossible because no rebirth in c1)
} 1...c7*b8=S[wSb8->g1] 2.e2*f1=S[bSf1->g8] Qg6*g8[wQg8->d1] {stalemate

Babson task.}

{

} 1.h2-h4 ? g7-g5 ! {
} 1.g2-g4 ? Sh1-g3 ! {

} 1.h2-h3 ! {
} 1...g7-g6 {(same move would follow} 1...DKe8-g6 {.)} 2.nDGa8*h6 # {via c6
(Mate by double check: DGh6-e3-a3 & DGf3-a8-a3 ;
mat by the DG initially in a8 and f3. Thematic variant 1.
} 1...Sh1-f2 {or g3} 2.nDGf3-a1 # {via h1
( mate by double check: DGa1-c3-a3 & DGf8-f3-a3 ;
mast by the DG initially in f3 and f8; thematic variant 2 ;
. the check is even tripled because the DGa1 can also go through c1)
} 1...b7-b5 2.nDGf3-a5 # {via f5
(mate by double check similar to the previous one : DGa5-c3-a3 & DGf8-f3-a3 ;
even triple failure because the DGa5 can also go through c5)
} 1...h6-h5 2.nDGf8-e3 # {via h6
mate by double check : DGf3-d3-a3 & DGa8-f8-a3 ;
(please note that there is no dual with } 2.nDGf8-h4 + {via h6 because of } 2...nDGh4-f8 {)
} 1...b7-b6 2.nDGf8-a5 # {via d8
(mate by double check : DGa5-c3-a3 & DGa8-f8-a3 ;
mast by DG initially in f8 and a8; thematic variant 3)
} 1...g7-g5 2.nDGf8-h4 # {via d8
(this mate is not by double check, but a simple DGa8-f8-a3 discovery, because the DRGe8 is immobilized !
and which cannot be parried by} 2...nDGa8-d8 {via f8, because of } 3.nDGd8*a3 {always via f8


Cycle AB-BC-CA : a8-f3, f3-f8 & f8-a8.}

{

if it was Black to move, he would play} 1...PAf8-f1 # {, il faut donc leur rendre la main

} 1.Ba2-c4 ! 1...PAf8-f1 + {
} 2.Kb1-a2 2...PAf1-f8 {
} 3.Bc4-f1 3...PAf8-f2 + {
} 4.Ka2-a1 4...PAf2-f8 {
} 5.Ka1-b1 5...PAf8-f2 {
} 6.Bf1-c4 6...PAf2-f8 {
} 7.Bc4-a2 7...PAf8-f1 # {

Switching moving manoeuvre using White King triangulation}

{

} 1.e7-e5 e2-e4 {
} 2.e5*f4 e4-e5 {
} 3.f4-f3 e5-e6 {
} 4.f3-f2 e6-e7 {
} 5.f2*g1=S e7-e8=S # {
Knight e8 entrusts his moving way to Friend c7, who entrusts it to Friend b5.
. Please note :
} 5.f2*g1=B ? e7-e8=S + 6.Fh2*c7 ! {
et également} 5.f2*g1=R ? {which checks the White King who has entrusted his moving way to the Friend f1

. The famous "100$" theme: double Excelsior with Knight Echo promotions.}