py_20170411

1 - maximum s#2

G.Antonoff
1958

white Ba8 Gb1 Ka4 Nc2d1 Pa3a5c7f7 Rd7 black Pf3g4f2e2a7 Ke4 Rb7

s#2 maximum(10+7)
🨢c2, d1: Nightrider
🨟b1: Grasshopper

black is required to play the geometrically longest legal moves
. selfmate white forces black to mate themr

Solution

{

} 1.Nc2-a1 ! {zugzwang, the longest move for black is the capture on d1
} 1...e2*d1=Q + {NId1 prevents 1...Kf5.} 2.Na1-c2 2...Qd1*d7 # {
note that if } 2.Na1-b3 {then} 2...Qd1*d7 {is no longer mat because of } 3.Nb3*d7 {
} 1...e2*d1=R 2.Rd7-d4 + Rd1*d4 # {
} 1...e2*d1=B + 2.Na1-b3 Bd1*b3 # {
} 1...e2*d1=S 2.Gb1-e1 {(prevents Ne3)} Sd1-c3 # {ou} 2...Sd1-b2 # {
} 1...e2*d1=BG 2.Rd7-d8 BGd1*a1 # {
} 1...e2*d1=BN 2.Na1*g4 BNd1-g7 # {justification for the Pa7.

Super-AUW in simple and economical form.}

2 - #2 échecs "billard"

A.Chicco
1948

white Qc3 Pf3d3c2h2 Kf1 Rd5 Ba4c1 black Pf6f2a3 Se8d6 Re3 Kf4

#2 billard(9+7)

Billiard chess diagonal moving pieces (Q and B) bounce off the boards

Solution

{

} 1.Qc3-d4+ ? Kf4*f3 ! {
} 1.Qc3*f2 ? Sd6-f5 !{

} 1.Ba4-d7 ! {Blocus.
} a3-a2 {Nd6 is now pinned by Bc1.} 2.Rd5-f5# ! {(} 2.Qc3-b4+ ? Kf4*f3 {)
} 1...Se8-c7 {(allows Bd7 to defend f3)} 2.Qc3-b4# {(Nd6 is pinned by wQ)
} 1...Se8-g7 2.Qc3-d4# {Nd6 is still pinned by wQ, but this time via a7 & b8)
} 1...Kf4*f3 2.Qc3*f2# {via e1
} 1...f6-f5 2.Qc3-g3# {via a5-d8-h4)}

3 - #5 Growing Men

growing Men a playing unit must make a move of equal or greater length than its previous move

P.Bissicks
2015

white Qg2 Kf3 black Pd5b7 Ke1

#5 Growing Men(2+3)

Solution

{

} 1.Qg2-g1+ ? Ke1-d2 2.Qg1-f2 {
2.Qe1+ does not check but restricts bK d5-d4! not 2...Kxe1? 3 Ke3 & 4 Ke2#) 3 Kf2 d3! preventing 4 Ke2#
} 2... Kd2-c3 3. Qf2-e3+ Kc3-b4 ! {3... Kb2 ? 4. Qd2+} 4.Qe3-d4+ Kb4-a5 ! {4... Ka3 $2 5. Qc3 #} 5.Qd4-c5+ b7-b5 ! {
} 1.Qg2-e2? {does not check

} 1.Kf3-e3 ! {Threatens 2 Qg1#.
} 1...d5-d4+ ? 2.Ke3-d3 b7-b6 3.Qg2-g1# {
} 1...Ke1-d1 ! 2.Qg2-f1+ {
} 2...Kd1-e1?! 3.Qf1-h1# ! 2...Kd1-c2 3.Qf1-d1+ !! {As in the try (echo chameleon), does not check but prohibits the bK from squares b1 & b3.
} 3...d5-d4+ 4.Ke3-e2 d4-d3+ 5.Ke2-d2# ! {
} 3...Kc2*d1 4.Ke3-d3 d5-d4 5.Kd3-d2#

4 - serial h#14 parrain Circe

B.Chamberlain
2011

white Sa2 Kf5 black Pb7 Sa3 Kf8

ser-h#14 parrain Circe(2+3)

: a captured piece remains suspended and makes an equipollent move to the next playing unit

Solution

{

} 1.b7-b5 2.b5-b4 3.b4-b3 4.b3*a2 5.Kf8-g7[+wSb1] 6.a2*b1=S 7.Sa3-b5[+wSc3] 8.Sb1*c3 9.Sb5-c7[+wSd5] 10.Sc3*d5 11.Kg7-h8[+wSe6] 12.Sd5-f6 13.Sf6-g8 14.Sc7*e6 Kf5-g6[+wSf7] #

5 - serial h#3 with Paos

R.Bédoni
2016

white Kc6 PAg4 black Ka6 PAb8b7

ser-h#3(2+3)
2 solutions
🨵g4, 🨻b8, b7: Paos

piece that plays like a rook when it doesn't capture and like a Rook-Lion when it wants to capture

Solution

{

} 1.BPb7-b5 2.BPb5-a5 3.BPb8-b5 {display-departure-file} WPg4-a4 # {

} 1.BPb7-a7 2.BPb8-b5 3.BPb5-a5 WPg4-g6 #

6 - #2 Annan

H.Gockel
2016

white Pa6b5c4d6e7e5 Sh5d3 Bc6 Kf1 Ra3 black Qa7 Pe6g5h3f3f2 Kg4 Bg1

2#3 Annan(11+8)

A unit acquires the march of the friendly unit below it. For example the bK,
. due to Pg5, is momentarily a pawn, and thus cannot flee to h4, h5 or f5.

Solution

{

} 1.Sd3-c5 ? {threatens } 2.Ra3-c3# {, but not Bxf3, the Bishop having borrowed the identity of a Knight)} 1...Qa7*e7 ! 2.Ra3-c3+ e6*c4! { the e6 pawn, boosted like its c4 counterpart, has become a Queen
} 1...Qa7*c5? {frees the Bishop from its Knight} 2.Bc6*f3# {
} 1.Sd3-b2 ? {threatens } 2.Bc6*f3 # {and if } 1...Qa7-a8 {or} 1...Qa7-b7 {then } 2.Ra3-c3 # {but } 1...Qa7-e3 !{

} 1.Sd3*f2 ! {Does not check, but threatens} 2.Sh5-f6 # {the Knight f2 borrowing the march of his King. the square g3 is now guarded by the "Royal Knight" f2. but not 2 Bxf3, because the Bishop would acquire the march of the Knight f2.
} 1...Bg1*f2 2.Bc6*f3 # {
} 1...Qa7*f2 2.Ra3-c3 # {, the Pc4 acquires the march of a rook
} 1...Qa7*e7 2.Kf1*g1 # {

"Tertiary" threat correction, say the experts. Mate transfers: we find the threats of each try (Bxf3# & Rc3#) in the second white moves of the real play, but also of the other try.}

7 - h#2,5

G.Foster
2016

neutral Qc1 Ra1 black Kd3

h#2,5(0+1+2)
a)Anticirce & symétric circe
b)symétric anti-circe & Circe

the captured piece is reborn on the square symmetrical to the centre of the board

symétric anti-circe the capturing piece is reborn on the said symmetrical square

Solution

{

} a) {Anticirce & symétric Circe
} 1...nRa1*c1[nRc1->a1][+nQf8] 2.Kd3-c2 nRa1-a8 3.Kc2-b1 nRa8*f8[nRf8->a1][+nQc1]# {double return

} b) {symétric Anticirce & Circe
} 1...nQc1-g1 2.Kd3-e2 nRa1-f1 3.Ke2*f1[bKf1->c8][+nRh1] nRh1*g1[nRg1->b8][+nQd8]# {

Echo mats on opposite bands.}

8 - serial h#9 with double jumpers

Null moves are forbidden, for example ... DRd6-b6-d6.

H.P.Rehm
2011

white Pa6 Sa7c6 DBd2 Kc4 black Sd7 DBg7 Kc7 DKd6

ser-h#9(5+4)
🨌d2, 🨒g7: Bishop Double jumper
🨑d6: Rook Double jumper

makes a double move (like Marseille chess)
.
Solution

{

} 1.Sd7-f6 2.DKd6-e6 3.Sf6-e4 4.DKe6-e5 5.Se4-c5 6.BBg7-b6 7.DKe5-d5 8.Sc5-d7 9.DKd5-d6 {
(back). This is the diagram with the DBg7 on b6.
} Kc4-b4 # !!

9 - reflex #3

J.Morice
1993

white Bg2 Kh3 Qg5 Pf7g4d3b2 Se7b5 Re6a2 black Bg8a5 Kc2 Qh8 Pc7g7a4e4h4c3g3f2 Sa3h1

r#3(10+14)

when a mate is presented, it must be played

Solution

{

thematic tries :
} 1.b2*a3+ ? Kc2-b3 ! 2.Qg5-d5# {
} 1.b2*c3+ ? Kc2-d1 ! 2.Qg5-d2# {
} 1.b2-b3+ ? Kc2*d3 ! 2.Bg2*e4# {
} 1.b2-b4+ ? Kc2-b1 ! 2. Sb5*c3# {
non thematic tries :
} 1.Qg5-e3 ? Bg8-h7 ! {(} 1...Qh8-h6 ? 2.Qe3*f2+ Sh1*f2#{)
} 1.Qg5-f5 ? Bg8-h7 ! {
} 1.Se7-f5 ? Bg8-h7 ? 2.Qg5-d2+ c3*d2 3.g4-g5 Bh7*f5#{
} 1...Ba5-b6 ! 2.b2*a3+ {(2 Qf5 impossible)} Kc2-b3 ? 3.Ra2*f2 Sh1*f2# {
} 2...Kc2-b1 ! 3.Sb5*c3# {
} 1.Se7-d5 ? Bg8-h7 ! 2. Qg5-d2+ c3*d2 ? 3.g4-g5 Bh7-f5# {but} 2...Kc2-b3 ! 3.Ra2*a3# {

} 1. Se7-c8 ! {
} 1...Ba5-b6 2.Qg5-f5 ! Bg8-h7 3.g4-g5 Bh7*f5# {or} 2...Bb6-c5 3. Qf5*f2+ Sh1*f2#{
} 1...Qh8-h5 2.b2*a3+ Kc2-b3 3.Ra2*f2 {
} 1...Qh8-h6 2.b2*c3+ Kc2-d1 3.Ra2*f2 {
} 1...Qh8-h7 2.b2-b3+ Kc2*d3 3.Ra2*f2 {
} 1...g7-g6 2.b2-b4+ Kc2-b1 3.Ra2*f2 {
} 1...Bg8*f7 {ou} 1...Bg8-h7 2.Qg5-c1+ {or} 2.Qg5-d2+ {
} 1...Ba5-b4 2.Qg5-e3 {or} 2.Qg5-f5

10 - réflex #2 Checkless chess

A.Tuengler
2005

white Pb7b6d6d5f4d2 Sa5 Bc6e3 Kc5 Rb5 black Qb1 Ph7a6d3h3c2 Kh6 Rh4c1 Sg5g3

r#2 Checkless chess(11+11)

only ckeck allowed is checkmate

Solution

{

} 1.Rb5-b4 ? {threatens} 2.f4-f5 Qb1*b4 # {but} 1...Sg5-f7 !{
} 1.Sa5-c4 ? {threatens} 2.Be3-d4 Sg3-e4 # {or} 2...Sg5-e4 # {but} 1...Kh6-g7 !{
} 1.f4-f5 ? {threatens} 2.Rb5-b4 Qb1*b4 # {but} 1...Rh4-h5 !{

} 1.Be3-d4 ! {threatens} 2.Sa5-c4 Sg3-e4 # {or} 2...Sg5-e4 #{
} 1...Qb1-a2 2.Rb5-b4 Sg3-e4 # {or} 2...Sg5-e4 #{
} 1...Qb1-a1 2.f4-f5 Qa1*d4 #

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