Petko A. Petkov


Original Problems, Julia’s Fairies – 2015 (I): January – June

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No.785 by Petko A. Petkov – A splendid thematic complex, emphasizing the features of combination Circle SneK & Anti-Andernach conditions! (JV)


Anti-Andernach: A piece (excluding King) changes its color after any non-capturing move. After capture, the piece retains its color. Rooks on a1, h1, a8 and h8 can be used for castling, provided the usual other rules for that move are satisfied. After castling, Rooks do not change color, If White makes a non-capturing move with neutral or halfneutral piece, that piece becomes black and vice versa.

Circle SneK: When a Queen is captured – a Rook (or Royal Rook) of the same color (if exists on the board) becoming Queen; When a Rook is captured – a Bishop (or Royal Bishop) of the same color (if exists on the board) becoming Rook; When a Bishop is captured – a Knight (or Royal Knight) of the same color (if exists on the board) becoming Bishop; When a Knight is captured – a Queen (or Royal Queen) of the same color (if exist on the board) becoming Knight.
Only one piece may change its type after a capture. In case of option – the capturing side choose which piece will be transformed. The capture and the change of type is a single move. If this full move result a selfcheck – the capture is forbidden. The capture of a pawn is normal. The capture is normal also in the case when there is no piece on the board which should be transformed. Castling with Royal piece is not allowed.
(Note: The condition is named as a Circle SneK because the transformations are similar like in SneK Chess, but here all possible piece transformations are as a closed circle – Knight-Bishop-Rook-Queen-Knight… (pawns are excluded) (Test is possible with WinChloe 3,31).

No.785 Petko A. Petkov

original – 28.04.2015

Solutions: (click to show/hide)

white kc5 qd7 rf1 bb8g6 pf4 black ke3 qf8 se1 pa6b7e2e7f3g2h2f6

hs#3,5         b) Pb7→b5           (6+11)
Circle Snek

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Luce Sebastien
Luce Sebastien
May 3, 2015 13:47

Simply fantastic !!
Congratulations M. Petkov !

Diyan Kostadinov
Diyan Kostadinov
May 4, 2015 14:14

Very rich thematic complex. The combination of Circle SneK and Anti-Andernach looks interesting.
By the way – Thomas Maeder informed me that Circle SneK (and also SneK Chess) is programed and will be included in the next Popeye release.