{}
1.Bf1-b5[-a3] ? {, if it were not a3 pawn, would force checkmate. }
1...BRc5*b5-a5 # {mate, because capturing in a5 would be illegal with the rebirth of the piece in a1.
in video : } 2.Ka6*a5[+bBRa1] {the idea is clear : remove this annoying pawn;
it will be quite long}
1.Bf1-c4 ! BRc5*c4-c3[+wBf1] 2.Bf1-d3 BRc3*d3-e3[+wBf1] 3.Bf1-e2 BRe3*e2-e1[+wBf1] 4.Ka6-a7 ! BRe1*f1-g1[+wBf1] {}
5.Ka7-a8 ! BRg1*f1-e1[+wBf1] 6.Bf1-e2 BRe1*e2-e3[+wBf1] 7.Bf1-d3 BRe3*d3-c3[+wBf1] 8.Bf1-c4 BRc3*c4-c5[+wBf1] {
: diagramme avec le Roi blanc en a8 au lieu de a6.}
9.Bf1-b5 BRc5*b5-a5[+wBf1] {(no check, as square a9 does not exist)} 10.Bf1-c4 BRa5*a3-a2 {
(the pawn, having been captured on its rebirth square, is now in the box; it is now necessary to return to the starting formation)}
11.Bc4*a2[+bBRa1] BRa1*a2-a3[+wBf1] 12.Bf1-d3 BRa3*d3-e3[+wBf1] {}
13.Bf1-e2 BRe3*e2-e1[+wBf1] 14.Ka8-a7 ! BRe1*f1-g1[+wBf1] 15.Ka7-a6 ! {
(the King won't be able to be checkmated in a7, because Ka8 ! would paralyse the Rook-Locuste, the square a9 doesn't exist.)}
15...BRg1*f1-e1[+wBf1] 16.Bf1-e2 BRe1*e2-e3[+wBf1] 17.Bf1-d3 BRe3*d3-c3[+wBf1] 18.Bf1-c4 BRc3*c4-c5[+wBf1] {(diagram without the a3 pawn)} 19.Bf1-b5 WRc5*b5-a5[+wBf1] # !
3 - h#3 face-to-face b) back-to-back
Frankiss, Ch2020
white Kc8 Bf5
black Pb7c4b3 Kd5
h#3 face-à-face(2+4)b) dos-à-dos
face-to-face if two pieces of opposite colour are "face to face",
for example a white in e4 and a black in e5, they exchange their moving way.
back-to-back if two pieces of opposite colour are "back-to-back",
for example a white in e5 and a black in e4, they exchange their moving way.
created by John Beasley, a unit has to rest after every move,
time to digest his alcohol a little.
In "partial retro-analysis" (PRA) we consider all the "components" (said Luigi Ceriani) of a multiple position.
and as a result, there may be several WITHOUT DUAL solutions, depending on the history of the position.
{
If the last black move was ...Kc1, this King must rest, so we play} 1.Ke3-d2! {;
White King is in his turn immobilised and therefore any black response mate him, since it cannot be prevented} 1...Kc1*d2 {.
Likewise, } 1.Ke3-d3 ! {if the last move was a pawn move arriving in e4.
Or} 1.Ke3-e2 ! {if it was ...gxf3.
The 3 other cases are more resistant.}
1.f7-f8=R ! {(if the last move was a pawn move arriving in f6)} 1...f6-f5 ?
{is fortunately impossible, which justifies the white promotion, because otherwise} 2.Ke3*e4 {fails because of} 3.Rf8*f5 {}
1...c6-c5 2.Ke3-d4 ! {and Black mates whatever they play.}
1...Kc1-d1 2.Ke3-d2 ! {idem}
1...Sh4-g6 {(or g2)} 2.Ke3-f4 ! {idem}
1...Sh4-f5 {(don't check)} 2.Ke3-d4 ! {idem}
1.f7-f8=B ! {(if it was a pawn move c6)} c6-c5 ? {is fortunately impossible, which justifies the white promotion, because otherwise} 2.Ke3-d4
{fails because of } 3.Bf8*c5 {}
1.f7-f8=S ! {(if it was a knight's move)} Sh4-g6 ? {is fortunately impossible, which justifies the white promotion, because otherwise} 2.Ke3-f4 {fails because of} 3.Sf8*g6 {}
5 - h#2 5 solutions super-circe with leo and locuste
The Leo is a Chinese Queen (which requires a hurdle to capture)
The Locust plays like a Grasshopper but ingests the hurdle, necessarily of opposite colour.
the capturing side places the captured unit wherever it wishes within the limits of legality.
the capturing piece reborn on its original square if it is free, otherwise the capture is illegal.
the taking unit reborn on the square located at 4 diagonal steps, i.e. at the distance 4 x root of 2
(if the capture takes place in a2, it is reborn in e6).
it is when the unit does not capture that it is first reborn before playing, the capture being orthodox.
For example, the b7-pawn can play in b3 or b4, but not take in c3.
the capturing unit reborn on the column where it is located, e.g. Kxc3 is reborn in c1.
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