py_20230627

Schizophrenic Queen The Queen has a dual personality (Rook + Bishop) which can be divided

Solution

{

} 1.Qd5-d8[+wRd8][+wBd5] Ka7-a6 2.Rd8-a8 #

carousel Instead of playing a move, you can exchange the nature of a piece with one of your opponent's..

Solution

{

} 1.Kh7-g8 Gc6-e8 2.Qg6-h7 Kd7-d7[+wQe8][+bGh7] # {

} 1.Kh7-h7[+wQc6][+bGg6] Qc6-f3 2.Gg6-g8 Qf3-h5 #

upside down instead of making a move, you can reverse a piece

Solution

{

} 1.Kc2-c2[+wQa8] ! {
} 1...f6-f5 2.Qa8-h8 {
} 1...Ga7-g1 2.Kc2-c2[+wGa8] # ! {
} 1...Ka1-a1[+bQa7] 2.Qa8-h1 #

Solution

{

} 1.Bh6-g7 # ? {doesn't go, position being illegal, White to move (no last move possible for the Black King).
This can only be done on a cylindrical chessboard (last move ...Ka7-h8 or ...Ka8-h8).
So, no } 1.Bh6-g7 + ? Kh8-a7 ! {
but } 1.Bh6-e3 # ! {

BF had presented in the first part the symmetry with respect to the large black diagonal (Kf7, Bf8 & g8 / Kh8).
So 1 Bg7#! is correct (last moves g7-g8B+ Kh7-h8).}

sat a king is in check when it can play on a square where it is not in check in the traditional sense.
The side in check must immediately deny itself this escape square (without giving another one!).
Nc4 is pinned: if he played, the wK would have access to a4.
The Royal Grasshopper e4 does not have the "free square" b4, as this would be a self-check (free squares d4 and b2).

To understand SAT properly, we can sum it up by saying that the aim is not to capture the opponent's King but, on the contrary, to give him squares.
It is indeed very disturbing!
by K. Seetharaman in "the Problemist": "In SAT, a king or royal unit is in check if it has a flight.
Threatening to capture a king is ignored since it is not permitted.
When the opposing side creates a flight for the king, the defending side must immediately block the flight or move to a safe square from where there are no flights.
Inability to do so is mate."

Solution

{

} 1.Sf5-g7 ! {(threatens} 2.Rd8-d6 + Sf4-e6 # {)
} 1...Rb2-a2 2.Sc4-b2 + Ra2*b2 # {the wK cannot remove his access to a4, nor play there: he would still have c4 free.
} 1...Ra8*a7 2.Sc4-b6 + Ra7-b7 # {(if} 3.rWGe4-a8 {, c6 & e8 are still free)
} 1...Bc2*b3 2.Sc4-d6 + Bb3-e6 # {(if} 3.rWGe4-c2 {or} 3.rWGe4*g4 {, there is still e4 free
} 1...Sb1-c3 2.Sc4-d2 + Sc3-e2 # {

} 1...Ra8*d8 ? {illegal: the bK would escape on d4} 2...rBGb4-d4 {
} 1...Sf4-h3 ? {(or elsewhere) would mate, with the white King having h4 and possibly h6 later on.
} 1...h5-h4 ? {would also mate because of } 2.rWGe4*g4 {followed by } 3.rWGg4-g8 {or} 3.rWGg4-e4

roseThe Rose moves on an octagon (not regular, but harmonious),
where each side is a Knight step.
󼎜g7 defends the e2 pawn via e8-c7-b5-c3.
󼎜b4 défends the g2 pawn via d5-f4.
󼎜f8 controls square f2 via d7-c5-d3.
A move by the White King makes a discover check by the Rose f7, even after the key.

Solution

{

Tries :
} 1.Kc4-c5 + ? Kf1-f2 ! {
} 1.Kc4-d3 + ? Kf1-f2 ! {
} 1.Kc4-d5 + ? Kf1*g2 ! {
} 1.Kc4-b5 + ? Kf1*e2 ! {
} 1.Kc4-c3 + ? Kf1*e2 ! {

} 1.ROf7-h6 ! {threatens} 2.ROh6-e3 # {)
} 1...f3*g2 2.Kc4-d5 # {
} 1...f3*e2 2.Kc4-b5 # {
} 1...e5*d4 2.Kc4*d4 # {
} 1...f3-f2 2.Kc4-c5 # {
} 1...Bh5-g4 2.ROg7*g3 # {
} 1...Rg3-g4 2.Rb3*f3 #

camel Bouncer (1,3) (as a reminder, the Knight is a bouncer (1,2))

Solution

{

Tries :
} 1.CAc6-f5 ? {(threatens} 2.Rc8-c5 # {)} 1...Qh4-e7 ! {
(Rh5 no longer pins Pe5 and therefore} 2.Rd1*d4 + e5*d4 {)
} 1...Bb5-c6 2.Ba2*c4 # {or} 1...Re6-c6 2.CAf5-e8 # {
} 1.CAc6-d3 ? {(threatens} 2.Rc8-c5 # {)} 1...Bb5-c6 ! {
(Rd2 no longer pins Rd4 and therefore} 2.Ba2*c4 + Rd4*c4 {)
} 1...Qh4-e7 2.CAd3-g4 # {or} 1...Re6-c6 2.Rh5*e5 # {
} 1.CAc6-b3 ? {(threatens} 2.Rc8-c5 # {)} 1...Re6-c6 ! {
(Ba2 no longer pins Nc4 and therefore} 2.Rh5*e5 + Sc4*e5 {)
} 1...Qh4-e7 2.Rd2*d4 # {or} 1...Bb5-c6 2.CAb3-a6 # {

} 1.CAc6*f7 ! {(threatens} 2.Rc8-c5 # {)
} 1...Bb5-c6 2.Ba2*c4 # {
} 1...Re6-c6 2.Rh5*e5 # {
} 1...Qh4-e7 2.Rd2*d4 # {
}

bulgarian Bulgarian pieces can only be played if the sautoir can make an imitative move without a capture..
For the Pao & Vao, this applies to captures, the other moves being normal since they only use a sautoir to capture.

Solution

{

} 1.Rb8-b3 VAf4-h2 2.LIb2-b5[-b3][+bRg3] {: Rook make a Lion move
} 2...PAf5*b5[-e5][+wSc5] # {: Knight make a Pao move.

} 1.Rb8-b5 PAf5-h5 2.LIb2-b8[-b5][+bRg5] {: anew a Lion move
} 2...VAf4*b8[-e5][+wSd6] # {: Knight make a Vao move} {
}

neutral pawns can be played by a side or the other.
Note that a neutral pawn promote in neutral piece

Solution

{

} a) {
} 1.nPf2-f1=nQ nPa7-a8=nR 2.nRa8-h8 nQf1*h3 # {

} b) wKe4-->e3 {Ke4-->e3
} 1.Kh2-g2 Ke3-e2 2.nPf2-f1=nS nPa7-a8=nB # {

AUW} {
}