py_20180605
Click in the right part of the chessboard to move forward, left to move backward... or directly on the move in the solution
1 - h#2 bicaptures
Bedoni, R.1985
white Pa7h7 Kh1
black Pd2e2 Ka2
h#2 bicaptures(3+3)
{}
1.e2-e1=S ! {As a screen} h7-h8=B 2.d2-d1=Q {To control b1 & b3.} a7-a8=R# {it's really mat as} 3.Qd1-a4 {is illegal.
Note that} 2...a7-a8=Q + {is illegal because of} 3.Qa8*h1 ! {
It should also be noted that for the same reasons, the } 1...h7-h8=Q {is illegal
and finally, the move } 1.e2-e1=B {would allow an interposition in a5
AUW.}
2 - h#5 back-to-back
Tritten, P.2018
white Ke1 Bc1
black Ph7 Ke8
h#5 back-to-back(2+2)
{}
1.h7-h5 Bc1-h6 2.h5-d1=B {(pawn acquires the Bishop's march then promotes itself)} Bh6-g5 {}
3.Ke8-d7 Bg5-d8 + {(King acquires the Bishop's march... and Bishop the King's one)}
4.Kd7-h3 Ke1-f2 5.Bd1-g4 {(close diagonal h3-c8)} Bd8-h4 #
{The white Bishop acquires the King's march and thus attacks the black King
which acquires the Bishop's march and thus has only the controlled
squares g2 & f1.}
3 - h#9 2 sol avec zèbra & grasshoppers
Kotesovec, V.2017
white Zb1
black Ke5 Ge6f4h5
h#9 2sol.(1+4)
🨷b1: Zebra🨥e6, f4, h5: Grasshopper
{}
1.Ge6-e4 Zb1-e3 2.Ke5-d6 Ze3-c6 3.Ge4-b7 Zc6-e3 4.Kd6-c7 Ze3-g6 {}
5.Gh5-f7 Zg6-d8 6.Kc7-b8 Zd8-f5 7.Kb8-a8 Zf5-c7 8.Gf4-b8 Zc7-a4 {}
9.Gf7-a7 Za4-d6 # {}
1.Ke5-e4 Zb1-d4 2.Ke4-f3 Zd4-f7 3.Ge6-g8 Zf7-h4 4.Gh5-e2 Zh4-e6 {}
5.Kf3-g2 Ze6-g3 6.Gf4-h2 Zg3-d5 7.Kg2-h1 Zd5-f2 8.Ge2-g2 Zf2-h5 {}
9.Gg8-g1 Zh5-e3 # {
Echo from a corner to the other.}
4 - 2# disparates anti-andernach
Petkov, P.2010
white Qh7 Ka8 Ra3h2 Sb5g6 Be6
black Pd5d6g5g4 Bh4 Rc1 Ke4
#2 disparates(7+7)anti-andernach
{ }
1.Rh2-h1[+bRh1] ! {Blocus. Neither Rc1 nor Rh1 are allowed to play.
5 legal moves left.}
1...g4-g3[+wPg3] 2.Sg6-e5[+bSe5] # {}
1...d5-d4[+wPd4] 2.Sg6-f4[+bSf4] # {(} 2.Sb5*d6 ? Ke4*d4 {)}
1...Bh4-g3[+wBg3] 2.Sg6-h4[+bSh4] # {}
1...Bh4-f2[+wBf2] 2.Sb5*d6 # {}
1...Bh4-e1[+wBe1] 2.Qh7*h1 #
5 - h#2 anti-circe
Wenda, K.2009
white Pf2f7 Kc8 Bg1
black Pe2e7a5 Ka6
h#2 anti-circe(4+4)b) ♟a5-->b5
{
} a) {} 1.e2-e1=S f2-f3 2.Se1*f3[bSf3->g8] f7*g8=B[wBg8->f1] #{} b) bPa5-->b5 {pa5-->b5} 1.e2-e1=Q f7-f8=R 2.Qe1*f2[bQf2->d8] + Rf8*d8[wRd8->a1] # {AUW}
} a) {} 1.e2-e1=S f2-f3 2.Se1*f3[bSf3->g8] f7*g8=B[wBg8->f1] #{} b) bPa5-->b5 {pa5-->b5} 1.e2-e1=Q f7-f8=R 2.Qe1*f2[bQf2->d8] + Rf8*d8[wRd8->a1] # {AUW}
6 - h=2,5 2 sol parrain circe
Rallo, V.2017
white Sc8 Kd5
black Pd6 Kd8 Sc5
=2,5 parrain Circe(2+3)2sol.
{}
1...Sc8*d6 2.Sc5-b7[+bPc8] Kd5-e5 3.Sb7*d6 Ke5*d6[+wSc7] {=}
1...Kd5*d6 2.Kd8*c8[+bPc6] Kd6*c6[+wSb8] 3.Sc5-d7[+bPd8] Sb8*d7 {=Echo-chameleon.}
7 - sérial h=12 anti-circe
Ersek, T.2012
white Pg6d2f4 Ka8 Rf1 Se6 Bd1
black Pe7h7g5h2d3 Bb1 Rh1 Kh6
ser-h=12 anti-circe(7+8)
{}
1.Rh1-g1 2.h2-h1=R 3.Rh1-h2 4.Rh2*d2-h8 {}
5.d3-d2 6.Bb1*g6-c8 7.Bc8-d7 8.Bd7-e8 {}
9.Be8-f7 10.Bf7-g8 11.g5*f4-f7 12.Rg1-g6 Rf1-f6 {stalemate !}
8 - 7# with siren & tritons
Rehm, HP.2015
white Bd7 Ke7 WTg3 SIf6 Pe3 Sc3
black Pg6c4d3 Ke5 Ba8 BTd4 Rg1a1
#7(6+8)🨴f6: Siren🨵g3, 🨻d4: Tritons
{Triton d4 is pinned by the Siren f6.Try:}
1.SIf6-e6+? TRd4-e4 ! {}
1.TRg3-f3? {threatens} 2.SIf6-d6+ TRd4-f4 3.TRf3*f4-f5 # {
but} 1...Ra1-a6 ! {solves the problem.
Hence the key :} 1.SIf6-d6 + !{}
1...TRd4-f4 {now the Triton f4 is pinned by the Siren d6}
2.TRg3-f3 {threatens} 3.TRf3*f4-f5 # {by double check}
2...Ba8*f3 {crossing the critical square e4}
3.SId6-d4 + {3 Sie6+? Fe4 4 Sif6+ Trxf6-f7} TRf4-f6 4.SId4-f4 + TRf6-d6 {}
5.SIf4-f6 + {the g6 pawn protects the Siren from the assiduousness of the Triton}
5...TRd6-d4 {diagram without Triton g3 and with bB in f3 instead of a8}
6.SIf6-e6 + {}
6...Bf3-e4
7.SIe6-d6 # {}
6...TRd4-e4
7.SIe6-d5 # {Grimshaw interception).}
9 - 2# amu
Rosner, E & Gockel H2017
white Qa5 Pa7d4c2c5 Sd1f1 Bg4e5 Ke6
black Pa4b2e2 Sb1h1 Ba3 Ke4
#2 amu(10+7)b) ♙c5-->b4
{}
a) {}
1.Qa5-e1 ! {Blocus}
1...Sb1-d2
2.Sd1-c3 # {(} 2.Sf1*d2 ? {is illegal, the N being "observed" by 2 pieces)}
1...Sh1-g3
2.Sd1-f2 # {(in the same way,} 2.Sf1*g3 ? {is illegal)}
1...Sh1-f2
2.Sf1-g3 #{(} 2.Sd1*f2 ? {illegal)}
1...Sb1-c3
2.Sf1-d2 #{(} 2.Sd1*c3 ? {illegal)}
1...Ba3-b4
2.Qe1*e2 #{}
1...Ba3*c5
2.a7-a8=Q #
2.a7-a8=B #{}
b) wPc5-->b4 {pc5-->b4}
1.Bg4*e2 ! {Blocus}
1...Sb1-d2
2.Sf1*d2 #{}
1...Sb1-c3
2.Sd1*c3 #{}
1...Sh1-g3
2.Sf1*g3 #{}
1...Sh1-f2
2.Sd1*f2 #{}
1...Ba3*b4
2.Qa5-d5 # {
Note that } 1.Qa5-d5 ? {is illegal, as the Queen is not "observed" at all at the start of the moveAB-BA & CD-DC.}
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