Definitions: (click to show/hide)
Alphabetic Chess: The squares are considered in the order a1, a2…a8, b1…b8, c1 and so on to h8. At each turn, only the unit standing on the square which comes earliest in this order may move. However check and mate are normal.
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). Captures on the rebirth square are allowed. 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.
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No.1161 Erich Bartel
Germany
original – 03.12.2016
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Solution: (click to show/hide)
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white kh6
black kf5 Pa2b2c2f2
ser-h#16 (1+5)
Alphabetic Chess
Anti-Circe
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1.a2-a1=B 2.b2-b1=Q 3.Ba1-f6 4.Qb1-g1 5.c2-c1=S 6.Sc1-e2 7.Se2-g3
8.f2-f1=B 9.Bf1-g2 {
} 10.Kf5-e6 11.Ke6-f7 12.Bf6-h4 13.Kf7-g8 14.Qg1-h2
15.Bg2-c6 16.Bc6-e8 Kh6-g7 # {
(C+ by Popeye 4.75)}
4-fold promotion and mate by white rex solus. (Author)
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http://pdb.dieschwalbe.de/search.jsp?expression=PROBID=%27P1328214%27
The black Pawns must promote and move to the right, so that the black King can get to g8. The choices of promotion piece are all interesting. A dark-squared Bishop is needed so that 12.Bh4 will shield the h-file for the wK. A Queen is needed so that it can move diagonally to h2 (on h1 it would be able to prevent mate by 17.Qe1). A Knight is needed on c1 because a Bishop would check the wK, and a Rook would guard the g-file after moving to g3 (preventing the mate). A Bishop is needed on f1 because a Queen would check the wK when it arrived on c6. The wK is thus used in (at least) four different ways, as well as giving the mate!
Actually a Bishop promotion is needed on f1 because 8.f1=Q? 9.Qfg2 … 15.Qa8 16.Qe8, Kg7 17.Qe1!
Four promotions with interesting motivations in ideal economy. Who cares that the promotions do not form an AUW?!
AUW see already
http://pdb.dieschwalbe.de/search.jsp?expression=PROBID=%27P1327595%27
but with totally different motivation of promotions
Is it enough to justify this less harmonious rendition? A fifth promotion would prevent such a question… Is there some possibility to get it?