py_20170509

1 - h#2 Patrol Madrasi

Manhart, M & Pachl F
1997

white Kd1 Sc2 Rc8 Bf7 WNa1 black Bc3h7 Ka4 Qd8 Pa2d4 Sb5g5 Ra6h6

h#2 Patrol Madrasi(5+10)
3 solutions
🨢a1: Nightrider

to capture, a piece must be "observed" by a piece of its side at the start of the move
. two opposing pieces of the same kind that observe each other paralyse each other.

Solution

{

Beware, it is a Nightrider in a1.
} 1.Ra6-a5! Rc8-c4 + 2.Rh6-c6 WNa1-c5 # { : the Rc6 cannot break the double check by ...Rxc5, being no longer supported by the Ra6.
if} 2.Bc3-b4 ? 3.Rc4*b4 {is not mat because of} Bh7*c2! {
} 1.Bc3-a5! WNa1-c5 + 2.a2-a1=BN Bf7-b3 # { : the NIa1 cannot break the double check by ...NIxb3, being no longer supported by the Bc3
} 1.Qd8-a5! Bf7-b3 + 2.Bh7-g8 Rc8-c4 # { : Bg8 cannot break the double check by ...Bxc4, being no longer supported by Qd8

Cycle AB-BC-CA.
"Forsbergian" keys: several units on the same square.}

2 - #2 Functionaries chess

Rosner, E & Gockel H
2016

white Bd8f3 Kg8 Qd3 Pc7g2 Sf8 Ra4 black Pa5b5d5h4e3 Ke8 Bc6h6 Sa7 Rh3d1

#2 functionaries(8+11)

: a unit can only move, and a fortiori capture, if it is "observed" by an opponent unit

Solution

{

} {

} 1.Qd3-a3 ? {threatens} 2.Ra4-e4 # {but } 1...Rd1-d4 ! {on } 1...d5-d4 2.Bf3*c6 # {
} 1.Qd3*b5 ? {threatens} 2.Qb5*c6 # {but } 1...Rd1-c1 ! {on } 1...Bc6*b5 2.Ra4-e4 # {as for } 1...Bc6-d7 {, it is confronted with } 2.Qb5*d7 # {
} 1.Ra4-e4 + ? 1...d5*e4 ! {

} 1.Qd3*d5 ! {threatens} 2.Qd5-f7 # {
} 1...Rh3-h2 2.Qd5-f7 # {
} 1...Bc6*d5 + 2.Ra4-e4 # {
} 1...Rh3*f3 2.Qd5*c6 # {
} 1...Rd1*d5 2.Bf3-h5 # {

Both threats in the tries are found in the variations of the real play.}

3 - h#3 with neutral pawns

Foster, G.
2013

neutral Ph2g2e2 black Ke4 white Kb4

h#3(1+1+3)
2 solutions

Solution

{

} 1.Ke4-d4 nPe2-e4 2.nPg2-g1=nR nRg1-g4 3.nPh2-h1=nQ nQh1*e4 #{

} 1.Ke4-d5 Kb4-c3 2.nPe2-e1=nQ + nQe1-e7 3.nPh2-h1=nB nPg2-g4 # {
note that} 3...nPg2-g3 {is not mat because of} 4.nPg3-g2 ! {

An almost AUW}

4 - h#3 parrain Circe

Rallo, V.
2016

white Ke3 Sg1 black Pe2f2 Ke1

h#3 parrain Circe(2+3)
b) ♔e3-->d3

a captured unit remains "in the air" and makes an equipollent movement to the following move

Solution

{

} a) {
} 1.f2*g1=R Ke3-e4[+wSg2] + 2.Ke1-f1 Ke4-f3 3.e2-e1=B Sg2-e3 # {

} b) wKe3-->d3 {Re3-->d3
} 1.Ke1-f1 Kd3-e3 2.f2*g1=B + Ke3-f3[+wSh1] 3.e2-e1=R Sh1-g3 # {

mirror Echo.}

5 - 8++++ parrain Circe

Caillaud, M.
2002

white Bc1f1 Ke1 Qd1 Pa2b2c2d2e2f2g2h2 Sb1g1 Ra1h1 black Bc8f8 Ke8 Qd8 Pa7b7c7d7e7f7g7h7 Sb8g8 Ra8h8

8++++ parrain Circe(16+16)

Solution

{

} 1.e2-e4 d7-d6 {Pirc défence !} 2.e4-e5 d6*e5 3.d2-d4 {wP cannot be reborn in e7.} Qd8*d4 {
} 4.Bf1-d3[+wPb6] Ke8-d7 5.f2-f4 e5*f4 6.Ke1-e2[+wPf5] Qd4*g1 {
} 7.g2-g4 [+wSg3] f4*g3[-g4] 8.Bd3-b5[+wSe5][+wPe6] {++++}

6 - #15 all-in-chess

The only restriction: the immediate return move is forbidden

Ravishankar, S.
2016

white Pd4f4h4 Kc7 Rh6h5 black Pe7a6e6e5 Kd5

#15 all-in-chess(6+5)

all-in-chess a piece can be played by either side.

Solution

{

} 1.e5*f4+ {Although the pawn is black, it is manipulated by white !
} 1...Kd5*d4+? 2.Kd4-e5+ {White move !} Ke5-e4 {Forced move, as Black has to parry the check, cannot withdraw Rh5 and is not allowed to repeat the position by Kd4} 3.Ke4-f5+ Kf5-g4 4.Kg4-g5# {there is no way to escape the mate

} 1...Kd5-c4! 2.Kc4-b5+ {
et ici pas} 2...d4-d5? 3.d5*e6+ Kb5-a4 4.Ka4-a5+ {with mat on 9th
ni } 2...Kb5-b4? 3.Kb4-c5+ {with mate on 14th

} 2...Kb5-a4! 3.Ka4-a5+ Ka5-b4 4.Kb4-c5+ {
et ici} 4...Kc5*d4? 5.Kd4-e5+ {as above

} 4...Kc5-c4! 5.Kc4-d5+ e6-e5 6.e5*d4+ Kd5-c4 7.Kc4-b5+ Kb5-a4 8.Ka4-a5+ Ka5-b4 {
} 9.Kb4-c5+ Kc5-c4 10.Kc4-d5+ e7-e5 11.e5-e4+ Kd5-c4 12.Kc4-b5+ Kb5-a4 13.Ka4-a5+ Ka5-b4 14.Kb4-c5+ Kc5-c4 15.Kc4-d5# {

Return of the bK on its starting square, the 3 "e" pawns being on the 4th row.
. Small remark: only black units have been played in the solution, which is very rare.
Even in a serial helpmate, after for example 30 black moves, there is a single white move !}

7 - h#2 2 solutions + 2 variations Super-Circe with Locust and Leo

Soulivy, K.
2016

neutral LEe7 Lb8 black Kd4 white Sc2

h#2 super-circe(1+1+2)
🨖b8: neutral Locust
🩀e7: neutral Leo

a captured unit can be replaced aniwhere by capturing side in limit of legality
moves along the Queen's lines, using a jumper that she swallows, and lands just behind
Move as a Queen but needs a hurdle to capture

Solution

{

} 1.Kd4-c5 {
1st variation} nLEe7-d8 2.nLb8*d8-e8[+nLEd7] nLe8*d7-c6[+nLEc1] # {
2nd variation} 1...Sc2-e3 2.nLEe7-b7 nLb8*b7-b6[+nLEf2] # {
Note: the neutral Leo cannot be resurrected in g1} 2...nLb8*b7-b6[+nLEg1] {, for then would follow} 3...Kc5*b6[+nLf2] {intercepting the Leo g1.

} 1.Kd4-e4 {
1st variation} nLEe7-e8 2.nLb8*e8-f8[+nLEf6] nLf8*f6-f5[+nLEb1] # {
2nd variation} 1...Sc2-b4 2.nLEe7-e5 nLb8*e5-f4[+nLEa4] #

8 - serial #13 Köko

Seehofer, W.
1999

white Kg1 Rc3 black Sd8 Ke8

ser-#13 Köko(2+2)

: a piece can move and, a fortiori capture, only if it is, at end of a move, closer than another

Solution

{

} 1.Rc3-c7 2.Rc7-f7 3.Rf7-f2 4.Kg1-g2 {

} 5.Kg2-g3 6.Rf2-f4 7.Kg3-g4 8.Kg4-g5 {

} 9.Rf4-f7 10.Kg5-g6 11.Rf7-h7 12.Kg6-g7 {

} 13.Kg7-f8 #

9 - h#2 Masand

Crisan, V & Huber E
2005

white Pa7 Sh6 Kc4 black Pe7e2 Ke8

h#2 Masand(3+3)
2 solutions

a piece that checks causes the other pieces it observes to change colour

Solution

{

} 1.e2-e1=Q a7-a8=S 2.Qe1-e6[h6=b][e7=w] + Sa8-c7[e6=w] # {

} 1.e2-e1=R a7-a8=B 2.Re1-e4[e7=w] + Ba8-c6[e4=w] # {

AUW and model mates.}

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