py_20230328

1 - serial helpmate 5# with twin

Ott, M.
1996

white Re3 Pd3b3 Kh1 Sc6 black Pb2c2d2 Kc3

ser-h#5(5+4)
b) ♖e3 --> a3

Solution

{

} a) {
} 1.c2-c1=B 2.b2-b1=R 3.Rb1-b2 4.Rb2-c2 5.Bc1-b2 d3-d4 # {

} b) wRe3-->a3 {Re3 --> a3
} 1.d2-d1=S 2.b2-b1=Q 3.Qb1-c1 4.Qc1-d2 5.Sd1-b2 b3-b4 # {

AUW}

2 - serial helpmate 5# 2 solutions 2 variations with neutral pawn

Ott, M.
1980

neutral Ph7 white Kd1 black Bd8g6 Re8e7 Pf7g7c7e6f5g5 Sg8 Kf8

ser-h#5 2sol 2var(1+12+1)

neutral A neutral unit can be played by a side or the other

Solution

{

} 1.f5-f4 2.Bg6-d3 3.Re7-d7 4.Re8-e7 5.Kf8-e8 nPh7*g8=nR # {

} 1.f5-f4 2.Bg6-f5 3.g7-g6 4.Kf8-g7 5.Kg7-f6 nPh7-h8=nB # {

} 1.f7-f6 2.Bg6-f7 3.g7-g6 4.Kf8-g7 5.Kg7-h6 nPh7-h8=nQ # {

} 1.f7-f6 2.Kf8-f7 3.Re8-f8 4.Re7-e8 5.Bd8-e7 nPh7-h8=nS # {

AUW}

3 - serial helped stalemate 6= 2 solutions sentinels opponent pawns 2/8

Foster, G.
2008

black Ke8

ser-h=6 Sentinels opponent Pawns 2/8(0+1)
b) Ke8-d7 ser-h=4 Sentinels opponent Pawns 3/8

Every move defecate a pawn with opposite colour on the starting square
Here, the 2/8 of the statement stipulates that the maximum number of white pawns is 2 and black 8.
A small clarification, defecation does not occur on the 1st row, nor in the 8th
There is also a kind of twin with Kd7 serial helped stalemate 4= Sentinelles in opposing pawns 3/8

Solution

{

} a) {Sentinelles Adversary Pawns 2/8
} 1.Ke8-f7 2.Kf7-f6[+wPf7] 3.Kf6-f5[+wPf6] 4.Kf5*f6[+wPf5] 5.Kf6-g7 {
As the 2 white pawns are already there, there is no defecation on g6
} 6.Kg7-h7 f7-f8=Q {stalemate
} 1.Ke8-f8 2.Kf8-g7 3.Kg7-g6[+wPg7] 4.Kg6-g5[+wPg6] 5.Kg5*g6[+wPg5] 6.Kg6-h7 g7-g8=R {stalemate
Indeed it is well stalemate because if we capture Rg8, there is defecation of a white pawn on h7

} b) bKe8-->d7 {Ke8 --> d7 serial helped stalemate 4 moves 3/8
} 1.Kd7-c6[+wPd7] 2.Kc6-b5[+wPc6] 3.Kb5-b6[+wPb5] 4.Kb6-a7 d7-d8=Q {stalemate
} 1.Kd7-c7[+wPd7] 2.Kc7-b6[+wPc7] 3.Kb6-b7[+wPb6] 4.Kb7-a8 d7-d8=S {stalemate
}

4 - 3# Lost pieces

Widlert, K.
2017

white Bb5e1 Sa3h2 Rb1 Kd4 Pd3e3f3g3 black Bg8a7 Pf7b6 Ke2

#3 Lost pieces(10+5)

Lost pices In Lost Pieces, after each move I play,
all my opponent's units automatically disappear if they are attacked by a unit of my side,
without being able to avoid it.
But if the unit attacked by me has an available square, even if it is pinned, it does not disappear.

Solution

{

} 1.Kd4-e4 ! {(threatens } 2.d3-d4 # {)
} 1...f7-f5[-e3] + 2.d3-d4[-f5] + Bg8-c4 3.Bb5*c4[-b6] # {
} 1...f7-f6[-e3] 2.d3-d4 + Bg8-c4 3.Bb5*c4[-b6] # {
} 1...Bg8-h7[-e3] + 2.Ke4-d4 Bh7*d3 3.Kd4-e4[-d3] # {
} 2...Bh7-e4 3.d3*e4 # {

threemovers where only the White King plays (Kd4-e4-d4-e4) are rare !}

5 - hs#4,5 anda b) ♟f7 on f6

Crisan, V.
2020

neutral Bg6 Rg5 white Ka3 Sa4 Re3 Bd6 black Pg4f7 Kh6

hs#4.5 anda(4+3+2)
b) ♟f7-->f6

anda any unit (other than a King) that performs a direct check becomes immediately neutral.
If it is already neutral, it becomes white or black, depending on which side plays it.

Solution

{

} a) {
} 1...nBg6-c2 ! {(on 1...Bb1 ? it will be missing tempo !)
} 2.Re3-d3 nRg5-c5 3.Bd6-f8[+nBf8] + Kh6-g6 4.nBc2-b1 ! nRc5-b5 + 5.Rd3-d6[+nRd6] + nRd6-d3[+bRd3] # {

} b) bPf7-->f6 {f7-->f6
} 1...nRg5-a5 ! {(if you play 1... Rb5 ?, it will be missing tempo)} 2.Bd6-c5 nBg6-d3 3.Re3-h3[+nRh3] + Kh6-g5 4.nRa5-b5 ! nBd3-b1[+bRh3] + 5.Bc5-e3[+nBe3] + nBe3-c5[+bBc5] #

6 - serial helpmate consequent 11#

Loustau, JM.
1986

white Pc5d4e2 Ba1 Kb1 black Pe4b3b4a4b2 Se3a2 Kc3 Rc4

ser-h#11 consequent(4+4)

the legality of each position must be considered in an isolated manner (independently of the other moves)

Solution

{

} 1.Kc3-d2 2.Rc4-c2 3.Kd2-c3 4.Kc3-c4 5.Rc2-c3 {
If we only look at the current diagram, the last move could only have been d2-d4,
and so :} 6.e4*d3 ep. ! {
(here, on} 7.Kc4-d4 ? 8.Rc3-c4 {we have a retrostalemate)
} 7.d3-d2 ! 8.Rc3-d3 ! 9.Kc4-c3 ! 10.Rd3-d4 11.Rd4-c4 12.Ba1*b2 # !

7 - 2# with roses

Boyer, JP.
1979

white ROh7 Bf8 Rc8d8 Sd7e7 Qb3 Kb1 Pf5 black ROg2b2 Pf7c7b7d3 Ba6e3 Rd4 Kd6

#2(9+10)
󼎜h7, 󼎝g2, b2: Rose

Rounded extended Knight
For example Rose b2 can go to d7 via a4 and b6 and Rose g2 to e7 via h4 and g6

Solution

{

} 1.Qb3-b5 ! {(threatens } 2.Qb5-c5 # {on a neutral move like } 1...d3-d2 {)
} 1...Ba6*b5 2.ROh7*b7 # {(via g5 e4 c5)
} 1...b7-b6 {or} 1...Rd4-a4 2.Sd7-f6 # {: no Rob2-a4-b6-d7
} 1...Rd4-b4 2.Se7-g6 # {: no Rog2-e1-c2-b4-c6-e7 (} 2.Se7-g8 + ? ROg2-e7 {)
} 1...Rd4-c4 {or} 1...ROb2-a4 {or} 1...ROb2-f2 2.Qb5-e5 # {: no Rob2-c4xe5
} 1...Rd4-d5 {or} 1...Rd4-e4 2.ROh7*e4 # {
} 1...Rd4-f4 2.Qb5-d5 # {: no Rog2-f4xd5
} 1...Rd4-g4 2.Sd7-b6 # {: no Rob2-d1-f2-g4-f6-d7
} 1...Rd4-f4 2.Qb5-d5 # {: no Rog2-h4-g6-e7
} 1...Rd4-h4 2.Se7-c6 # {: no Rog2-e1-c2-b4-c6-e7 (} 2.Se7-g8 + ? ROg2-e7 {)
} {
}

8 - serial selfmate 14# bicolore Checkless check

Kekely, L.
2021

white Pa2b2 Ke1 black Rb4 Pa4a3 Kg1

ser-s#14(3+4)
bicolore Checkless check

A King can be checked by the pieces of his own side
the only check allowed is a checkmate

Solution

{

} 1.b2-b3 2.b3*a4 3.a4-a5 4.a5-a6 {
} 5.a6-a7 6.a7-a8=Q 7.Qa8*a3 8.Qa3-h3 {
} 9.a2-a4 10.a4-a5 11.a5-a6 12.a6-a7 {
} 13.a7-a8=Q 14.Qa8-a5 Rb4-b1 # {

The only possible move of the Rook :
check allowed as it is checkmate.
15 Ke2 forbidden because it would be a check to the Black King which would not be checkmate, the Rook being able to leave the 1st row.
Could be presented as a selfmate 1# starting after the 13th !} {
}

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