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or directly on the move in the solution
1 - 2# Anda
Petkov, P.2019
white Pc4g3 Sa3c2 Be1g6 Kb6 Rf5
black Pe2g4 Kd3 Re4
#2 Anda(8+4)
Anda(invented by the author of this problem), any unit (except King)
performing a direct check immediately becomes neutral. If it is already neutral, it becomes white or black, depending on which side plays it.
{Try :}
1.Kb6-c5 ? Re4-e6 ! {}
1.Kb6-c6 ! {}
1...Re4-e6=n + 2.nRe6-e3=w # {}
1...Re4*c4=n + 2.nRc4-d4=w # {}
1...Re4-d4 2.Rf5-d5 # {: the Bishop does not become neutral because his check is indirect}
1...Re4-e3 2.Rf5-f3 # {}
1...Re4-f4 2.Rf5*f4 # {}
1...Re4-e8 2.Rf5-e5 # {(} 2.Rf5-d5=n + ? nRd5-f5=b ! {}
2.Rf5-f3=n + nRf3-f5=b {)}
1...Re4-e5 2.Rf5*e5 #
2 - hs#4,5 reverse anda
Petkov, P.2019
neutral Pb6
black Pd2g2 Kh1
white Pb7 Kc8
hs#4.5 reverse Anda(2+1+3)
reverse anda any unit making a move that is not a direct check becomes immediately neutral.
If it is already neutral, it becomes white or black, depending on which side plays it.
{}
1...Kh1-h2 2.Kc8-b8 d2-d1=nR { : the Rook does not give check and therefore becomes neutral.}
3.Kb8-a8 nRd1-g1=b {Becomes a Black Rook.} 4.b7-b8=Q + {Remains a White Queen because of check.} 4...Kh2-h1 5.b6-b7=w
{Become a white pawn.} Rg1-a1 # {Other Rook moves are illegal, because the Rook that has become neutral would check the Black King.
(and there} 6.Qb8-a7=n {? is illegal because becoming a neutral Queen.
Please note that on } 4.b7-b8=R ? Kh2-h1 5.b6-b7=w {is prevented by } Kh1-h2 !
3 - 2# bicolores
Schiegl, H.1970
white Qc5 Kg6
black Pb3b2f4 Ra4 Ba6 Kb1
#2 bicolores(2+6)
In Bicolore, the Kings are so sensitive that they cannot tolerate being " checked " by the units of their own side.
button class="button" onClick="window.open('https://echekk.fr/?Echecs-a-Rois-KoBul','','scrollbars=no,resizable=no,status=no,location=no,toolbar=no,menubar=no')">kobul Kings when a unit is captured, the King of the camp of the said unit acquires his march.
He becomes a normal King again if you take a pawn.
Grasshopper that eats its hurdle (which is necessarily an opponent's piece)
Extended and rounded knight e.g. ROf8 can go to d7, c5, d3, f2, h3, h7, g6, f4, d3, b4, a6, b8
{}
1.BRd1-e3 WRf8-a6 2.Qe1-d1 WLh1*d1-c1 {=}
1.Kd2-c2 WRf8-h3 2.Qe1-c3 WLh1*d1-c1 {=It should be noted that apparently there are other solutions such as :}
1.BRd1-c3 WRf8-b4 2.Qe1-f1 WLh1*f1-e1 {but it's not pat ...because of the "null" move 3.ROc3-c3 via b5, c7, e8, g7, h5, g3 and e2 !!}
7 - #4 single combat & circé
Rittirsch, M.1990
white Pd7e6g4a2b3b4b5c4 Sg5a3 Bf7g3 Kh2 Rf3
black Pb7c7e7g7g6 Kh8 Bd8
#4 single combat circe(14+7)
a unit that has just played continues, until it is impossible.
a captured piece reborn on its original square if it is free, otherwise it disappears.
{}
1.b5-b6 ! {}
1...c7*b6[+wPb2] {(pb2 being blocked, an other unit can play.)}
2.Bf7*g6
2...b6-b5
3.Bg6-b1 zugzwang.
3...b5*c4[+wPc2]
4.Rf3-f8 # {(Bb1 being blocked, an other unit can play.)}
1...c7-c5
2.Rf3-f1 zugzwang.
2...c5*b4[+wPb2]
3.Rf1-h1 zugzwang.
3...b4*a3[+wSg1]
4.Kh2-g2 # {(Rh1 being blocked, an other unit can play)}
1...c7-c6
2.Bg3-e5 zugzwang.
2...c6-c5
3.Be5-a1 zugzwang.
3...c5*b4[+wPb2]
4.Rf3-h3 # { (Ba1 being blocked, an other unit can play)}
8 - h#4 2 solutions leffie
Crisan, V.2019
white Kf1 Bb1
black Pd3f3 Ke4
h#4 2sol. leffie(2+3)
Leffie is to the Eiffel what the Isardam is to the Madrasi: it is illegal to put oneself in a situation of Eiffel paralysis.
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