py_20230110
Click in the right part of the chessboard to move forward, left to move backward... or directly on the move in the solution
1 - s#6 circe
Gedda, B.1981
white Pb7c7 Rh2 Qh1 Ba4a5 Kd7
black Ph7 Rg1 Kf1
s#6 Circe(7+3)
{}
1.b7-b8=S ! {}
1...h7-h6 2.Kd7-d8 ! h6-h5 3.Ba4-e8 h5-h4 {}
4.Sb8-d7 h4-h3 5.Ba5-b6 Kf1-e1 6.Qh1*g1[+bRh8] + Rh8*e8[+wBf1] # {}
1...h7-h5 2.Rh2-g2 ! h5-h4 3.Qh1-h3 Rg1-h1 {}
4.Kd7-c8 Rh1-h2 {or on g1} 5.Ba4-d7 Rh2-h1 6.Qh3*h1[+bRa8] + Ra8*b8[+wSg1] #
{Chameleon-echo}
2 - h#2 2 sol patrol chess
Antonini, D.2020
white Ra1h1 Sd1 Ke1
black Kb3 Rb2
h#2 2sol. Patrol Chess(4+2)
{}
1.Kb3-a2 0-0 2.Rb2-b3 Sd1-b2 #
{}
1.Kb3-c2 Sd1-c3 2.Rb2-b3 0-0-0 #
{Short and long castles}
3 - h#2 2 sol magic King
Steudel, Th1985
white Pe7 Kg7
black Pg3c2
black Magic Kh5
h#2 2 sol.(2+3)♚h5: magic King
{}
1.c2-c1=Q e7-e8=R 2.Qc1-f4 Re8-h8 #
{Kg5 (or g4) is not legal. In pictures :}
3.mKh5-g5[+wQf4] {}
1.c2-c1=B e7-e8=S 2.Bc1-f4 Se8-f6 #
{Kh4 is illegal. In pictures : }
3.mKh5-h4[+wPg3] {or} 3.mKh5-g5[+wBf4][+bSf6]
4 - 1# cylinder tore moebius
Millman, St L & Volet Th1980
white Sh5g1 Qb7 Kf8
black Sa3d4 Kh8
#1(4+6)
a) normal
b) vertical cylinder
c) horizontal cylinder
d) tore
e) vertical moebius
f) horizontal moebius
{}
a) {normal}
1.Qb7-g7 # {}
b) { vertical cylinder}
1.Qb7-a7 # {}
c) { horizontal cylinder}
1.Qb7-h7 # {}
d) {tore}
1.Qb7-a8 # {}
e) { vertical moebius}
1.Qb7-a2 # {}
f) { horizontal moebius}
1.Qb7-g8 # {}
5 - 3# breton with Antelopes, Giraffes and Camels
Trommler, S.2021
white WAa8 WGe8 WCd5 Sh7 Kg6 Bg7
black BAa3 BGe2 BCg1 Pf3e7d6 Rd1c7 Sb3 Kg8
#3(6+10)
🨢a8, 🨨a3: Antelope🨍e8, 🨓e2: Giraffe🨷d5, 🨽g1: Camel
{
} 1.WCd5-a6 {(threatens} 2.WCa6-d7 + Rc7*d7[-g1] 3.WGe8-f4 # {)} 1...e7-e5 2.WGe8-f4 + BCg1*f4[-e2] 3.Sh7-f6 # {(idem on} 2...e5*f4 { )} 1...Rd1-d4 2.Sh7-f6 + BGe2*f6[-b3] 3.WAa8*d4 # {(idem on} 2...e7*f6 {)} 1...Rc7-c4 2.WAa8-d4 + Rd1*d4[-a3] 3.WCa6-d7 # {( idem on} 2...Rc4*d4[-a3] {or} 2...Sb3*d4[-a3] {) The threat is also realized on } 1...BAa3-d7 2.WCa6*d7[-a8]{etc. AB-BC-CD-DA cycle .}
} 1.WCd5-a6 {(threatens} 2.WCa6-d7 + Rc7*d7[-g1] 3.WGe8-f4 # {)} 1...e7-e5 2.WGe8-f4 + BCg1*f4[-e2] 3.Sh7-f6 # {(idem on} 2...e5*f4 { )} 1...Rd1-d4 2.Sh7-f6 + BGe2*f6[-b3] 3.WAa8*d4 # {(idem on} 2...e7*f6 {)} 1...Rc7-c4 2.WAa8-d4 + Rd1*d4[-a3] 3.WCa6-d7 # {( idem on} 2...Rc4*d4[-a3] {or} 2...Sb3*d4[-a3] {) The threat is also realized on } 1...BAa3-d7 2.WCa6*d7[-a8]{etc. AB-BC-CD-DA cycle .}
6 - 2# Shrinking men b) mirror-position
Turnbull, R & Bissicks P2012
white Kb3 Qd1
black Ka1
#2 shrinking men(2+1)b) vertical mirror
{}
a) {}
1.Kb3-a4 ? {illegal}
1.Qd1-c1 ? Ka1-a2 2.Qc1-b1 {stalemate and } 2.Qc1-b2 ? {illegal}
1.Qd1-c2 ! Ka1-a2 2.Qc2-b1 # {
But not} 2.Qc2-b2 + ? Ka2-a1 ! {}
b) mirror a1<-->h1 {vertical mirror
This time, no King is a priori "shrunk": Ke1-f2-g3 & ...Ke8-d7-e6....
But in reality, the Black King is :
the last move could not be ...Kg2-h1 because his White colleague would have been in check.}
1.Qe1-f2 ? {stalemate.
In the same way} 1.Qe1-f1 ? {or} 1.Kg3-h3 ? {}
1.Qe1-e2 ? Kh1-g1 2.Kg3-h2 + Kg1-f1 ! {}
1.Kg3-h4 ! Kh1-h2 2.Qe1-g1 #
{But not } 1.Kg3-g4 ? Kh1-h2 2.Qe1-g1 + Kh2-h3 !
7 - h#2,5 kobul Kings b) ♛h8
Tritten, P.2013
white Ka8 Rb8 Bg6e3 Pf5f4d3b4b3
black Qe8 Pa6a2c5e6 Ra1 Kb1
h#2.5 Kobul(9+7)b) ♛e8-->h8
{}
a) {}
1...Bg6*e8[b1=rQ] 2.rQb1*b3 Be8-a4 + 3.rQb3-b1 b4*c5[b1=K] # {}
b) bQe8-->h8 {De8-->h8}
1...Rb8*h8[b1=rQ] 2.rQb1*d3 Rh8-h2 3.rQd3-b1 f5*e6[b1=K] #
{Two switchbacks of the Black King after opening a line.}
8 - h#2,5 2 sol Ghost Chess
Beaubestre, Cl2021
white Rb6 Bb7
black Sc7 Pe5 Kf5
h#2.5 Ghost Chess 2sol.(2+3)
{}
1...Rb6-e6 2.Sc7*e6 Bb7-f3 3.Se6-g5[+wuRe6] uRe6-f6 # {}
1...Bb7-d5 2.Sc7*d5 Rb6-g6 3.Sd5-f4[+wuBd5] uBd5-e4 #
9 - serial h#8 mao, moa and grasshopper
Novomesky, D.2012
white Sb5 Pa3e2 Bf3 Kd1
black Pc5d4c3 Ke6 MAb3
ser-h#8(5+12)a) 🨓b3b) 🨽b3c) 🨥b3
{}
a) {}
1.MAb3-a5 2.MAa5-b7 3.MAb7-d6 4.MAd6-e4 {}
5.Ke6-d5 6.Kd5-c4 7.MAe4-d2 8.MAd2-b3 {(what a Moa could not do)} Sb5-d6 # {}
b) +bMOb3 {Moa b3}
1.MOb3-d2 {(what a Mao could not do)} 2.MOd2-e4 3.Ke6-d5 4.Kd5-c4 {}
5.MOe4-d6 6.MOd6-b7 7.MOb7-a5 8.MOa5-b3 Sb5-d6 # {}
c) +bGb3 {Grasshopper b3}
1.Gb3-b6 2.Gb6-b4 3.Gb4-e4 4.Ke6-d5 {}
5.Kd5-c4 6.Ge4-e1 7.Ge1-e3 8.Ge3-b3 Sb5-d6 #
10 - 2# Checkless chess
Checkless chess The only checks allowed are checkmates Notably, if the only parries to a check make themselves a simple check, then that first check is actually a mateGockel, H.2018
white Pc6g6h3b2 Se7g8 Re4 Qd4 Kc4 Ba2
black Pa6g5f2e5 Bh8 Sh7g4 Qh4 Rf3d6 Ke6
#2 Checkless chess(10+11)
{}
1.Qd4-c3 ? {(threatens} 2.Kc4-c5 # {)}
1...Sg4-f6 {display-departure-file} 2.Qc3*e5 # {}
1...Sh7-f6 {display-departure-file} 2.Re4*e5 # {as} 2...Sg4*e5 + 3.Kc4-b3 {but not } 2.Qc3*e5 + Sg4*e5 # {: no 3 Kb3 and 3 Kc5+ illegal}
1...Rf3*c3 + {illegal as} 2.b2*c3 {
but} 1...Rd6-d5 ! {anticipates all problems}
1.Kc4-c5 + {illegal} 1...Rf3-b3 ! {}
1.Re4-e3 ! {(threatens} 2.Kc4-c5 # {)}
1...Sg4-f6 {display-departure-file} 2.Re3*e5 # {}
1...Sh7-f6 {display-departure-file} 2.Qd4*e5 # {and} 2...Sg4*e5 + {is illegal bescause of } 3.Kc4-b3
{(} 2.Re3*e5 + ? Sg4*e5 # {:
this check is in fact a mate because the replies} 3.Kc4-b4 + {&} 3.Kc4-c5 + {are simple checks and so illegal}
1...Rf3*e3 2.Qd4*g4 # {et } 2...Qh4*g4 + {is illegal because of } 3.h3*g4 {!!}
1...Rd6-d5 2.Qd4*d5 # {}
1...Rd6*c6 + {illegal :} 2.Qd4-c5 {or} 2.Kc4-b3 {or } 2.Kc4-b4 # ! {}
1...Sg4*e3 + {illegal : } 2.Kc4-b3 {!!
Mates exchanged AB-BA between the trial and the real play.}
11 - 3# with Edgehogs
Gockel, H.2021
white EHc1g1a5 Bh3 Pg2c2c4d6e5 Kf7 Sf6h1 Ra4
black EHh4d2 Pc3g3g5 Rg4 Kf5
#3(13+7)c🨊c1, g1, a5, 🨐h4, d2: Edgehogs
{
} 1.Ra4-a1 ! {(threatens } 2.WHc1*d2 3.Ra1-f1 # {)} 1...BHd2*c1 2.Ra1*c1 threat: 3.Rc1-f1 # {} 1...BHd2-d1 2.Bh3*g4 + 2...BHd1*g4 {display-departure-file} 3.e5-e6 # {} 2...BHh4*g4 {display-departure-file} 3.Sh1*g3 # {Note that} 2.e5-e6 + BHd1-d5 3.WHa5*d5 {is legal but doesn't check !} 1...BHd2-e1 2.Sh1*g3 + 2...BHe1*g3 {display-departure-file} 3.e5-e6 # {} 2...BHh4*g3 {display-departure-file} 3.Bh3*g4 # {} 1...Kf5-f4 2.WHc1*d2 {(threatens } 3.Ra1-f1 # {) Note that on} 2.WHc1-b2 {or} 2.WHc1-a3 {with same threat, Black replies} 2...BHd2-c1 {or d1 or e1}
} 1.Ra4-a1 ! {(threatens } 2.WHc1*d2 3.Ra1-f1 # {)} 1...BHd2*c1 2.Ra1*c1 threat: 3.Rc1-f1 # {} 1...BHd2-d1 2.Bh3*g4 + 2...BHd1*g4 {display-departure-file} 3.e5-e6 # {} 2...BHh4*g4 {display-departure-file} 3.Sh1*g3 # {Note that} 2.e5-e6 + BHd1-d5 3.WHa5*d5 {is legal but doesn't check !} 1...BHd2-e1 2.Sh1*g3 + 2...BHe1*g3 {display-departure-file} 3.e5-e6 # {} 2...BHh4*g3 {display-departure-file} 3.Bh3*g4 # {} 1...Kf5-f4 2.WHc1*d2 {(threatens } 3.Ra1-f1 # {) Note that on} 2.WHc1-b2 {or} 2.WHc1-a3 {with same threat, Black replies} 2...BHd2-c1 {or d1 or e1}
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