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No.738 |
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No.738 by Vlaicu Crișan & Andreas Thoma – Unusually long and interesting Retro-play! (JV)
Definition:
Anti-Circe: After a capture the capturing piece (Ks included) must immediately be removed to its game array square (necessarily vacant, else the capture is illegal). R, B & S go to the square of the same colour as the capture; Ps stay on the file of capture; fairy pieces go to the promotion square of the file of capture.
Proca Retractor: In Retractors, White and Black retract (take back) a given number of moves (-n moves), in order to reach a position in which a forward stipulation (e.g. #1, s#1) is met. Proca is a defensive retractor. Given a choice, Black will retract those moves that avoid or delay White’s goal. Black may defend by mating White through a forward move, if such an opportunity exists after one of Black’s retractions. Unless otherwise specified, forward defense is the default condition of Proca retractors.(def. from StrateGems, http://strategems.net/sections/fairy_defs.html)
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No.738 Vlaicu Crișan & |
Solution: (click to show/hide) |
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white ke1 Pb2e7
black ke5 Sh8 Pb3
-20 & #1 Proca Retractor (3+3) |
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Effectively doubles the content of 706.1, with only 6 pieces!
Has the draw pendulum in AntiCirce-Proca ever been doubled in miniature form before? I remember only doublings (and one 4-fold setting) with many more pieces.
It is funny to see the 3-move repetition rule for ‘Tournament Chess’ being applied to Anti-circe problems ! Unlike the en-passant, casling or promotions, this is not a chess rule. But more akin to 5o-move draw rule of Tournament Chess. There is no automatic draw after the third repetition. In the tournament, either player has to claim it!
I lost it at Move 2 ( uncapturing Ke2xBd1). How could white have been standing on e2, in check (diagonally flanked) by both bBd1 and bPf3? Never saw a double check like that before. I must be blind to legal retro play.
The bPf3 does not give check in Anti-Circe, because its rebirth square (e7) is occupied.
Thanks. Did not know that about Anti-Circe checks being nullified if rebirth square occupied. Knew about how captures themselves applied. Does make sense…wK needn’t move away…an empty threat.