No.666 by Eugene Rosner – A sister Retro-problem to No.652. From the author’s words “rooks launching bishops into retroanalytically-questionable neighborhoods!” (JV)
No.666.1 by Eugene Rosner – An improved version to No.666. (JV)
Definitions:
Alsatian: Every position must be orthodox legal.
Annan Chess: If two pieces of the same colour are standing close to each other in N-S-direction, the front piece moves only like the rear piece as long as the contact is existing. The front piece is that piece that is closer to the own promotion line. White/Black Pawns on the 1st/8th rank cannot move, but can give their kind of moving to a front piece. Officers moving with the power of a Pawn to the promotion line do not promote; if they make a double-step with the power of a Pawn, they cannot be captured en-passant; but officers with the power of a Pawn can capture a Pawn en-passant.
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No.666 Eugene Rosner
U.S.A.
original – 13.12.2014
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Solution: (click to show/hide)
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white Kb6 Rb7 Rb3 Bc8 Bb4 Pa6 Pa4 Pc2 Pc5 Pa2 Pf5
black Kf6 Bg8 Pd7 Pf7 Pc6 Pc3 Pe3 Pg3
#2 (11+8)
Alsatian Annan Chess
(partially tested by author, Popeye 4.67)
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Diagram: WPs make 6 visible pawn captures
1.Rb7-c7{! zz
(not 2.c8d8#? as there is no last move by the bishop; if it's a promotion Pxd8=B, this will require 3 more WP captures with only 8 missing Black units, one more than inventory provides) }
1...d7-d6{,d5} 2.Bc8-d8#{display-departure-square}
{last move Re7(x)c7#!
Now, one of the two B square bishops is a WP promoted on f8 or h8
(1...d5 2.Rxc6?-R moves like a P, similarly, 1.Rb1, 2.Bxc3 is not a threat) }
1...e3-e2 2.Bb4-d4# {display-departure-square} {last move B(x)d4# }
1...g3-g2 2.Bb4-h4# {display-departure-square} {last move B(x)e4# }
1...Bg8-h7 2.Bc8-h8# {display-departure-square} {last move Pxh8=B# }
Arrival paradox on d8, 4 echoed Annan mates, Alsatian retroanalysis.
Last move Pxx8=B fails in a threat line, but is available in a variation. (Author)
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No.666.1 Eugene Rosner
U.S.A.
Version of 666 – 15.12.2014
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Solution: (click to show/hide)
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white Kb7 Rb8 Rb3 Bc8 Bb4 Pa6 Pa4 Pa2 Pb6 Pc5 Pf5
black Kf6 Bg8 Pd7 Pf7 Pc6 Pc3 Pe3 Pg3
#2 (11+8)
Alsatian Annan Chess
(partially tested by author, Popeye 4.67)
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Diagram: WPs make 7 visible pawn captures
1.Bb4-b5? (2.b6-d8=Q#) c6xb5!
(one of the two W square bishops is a WP promoted on g8)
1.3R~? (2.Bxc3#) d5!
1.Rb8-c7{! zz
(not 2.c8d8#? as there is no last move by the bishop; if it's a promotion Pxd8=B, this will require 3 more WP captures with only 8 missing Black units, two more than inventory provides) }
1...d7-d6{,d5} 2.Bc8-d8#{display-departure-square}
{last move Re7(x)c7#!
Now, one of the two B square bishops is a WP promoted on f8 or h8
(1...d5 2.Rxc6?-R moves like a P) }
1...e3-e2 2.Bb4-d4# {display-departure-square} {last move (gfe)B(x)d4# }
1...c3-c2 2.Bb4-d4# {display-departure-square} {last move (abc)Bxd4# }
1...g3-g2 2.Bb4-h4# {display-departure-square} {last move (efg)B(x)e4# }
1...Bg8-h7 2.Bc8-h8# {display-departure-square} {last move Pxh8=B# }
Arrival paradox on d8, 4 echoed Annan mates, Alsatianretroanalysis. Annan and Anti-Annan try, Annan key. (Author)
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