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Problem 630: Mark Basisty, Andriy Frolkin & Anatoly Vasylenko - Twomover
mark.basistyandriy.frolkinanatoly.vasylenko(29.11.2015) Welcome to Andriy Frolkin and Mark Basisty of Ukraine who combining with their compatriot Anatoly Vasylenko give us an interesting twomover with retroanalytical content! 'Can white castle?' is the question they ask!
 
 
 
 
 
 
630. Mark Basisty, Andriy Frolkin & Anatoly Vasylenko (Ukraine)
29.11.2015
631
#2 vvv                      (14+8)
 
1.Rg1? [2.Qf6# A],  1...B:g4 2.Rf1# B (Nietvelt)  
1...Bg2 2.Se2# C, 1...g5 2.Qg3#, 1...Be5!
 
1.Rf1? B [2.Se2# C], 1...h:g4 2.Qf6# A, 1...e:d3 2.S1:d3#, 1...Ra1!
 
1.O-O? [2.Se2#], 1...h:g4 2.Qf6#, 1...e:d3 2.S1:d3#,   illegal!
 
1.R:f3+?,  1...e:f3 2.S1d3#,  1...K:f3 2.O-O#?? illegal!!
 
1.e7! [2.Se6#], 1...e3 2.d:e3# ,1...h:g4 2.Qf6#,  1...e:d3 2.S1:d3#,
1...B:g4 2.Rf1 # (2.O-O#??? – illegal!!!)
 
 
Pseudo Le Grand, Nietvelt.
Retroanalysis-based refutation of white moves performing different functions:
(First move in a try; Mating move; Dual being avoided)!  (Authors)
 
White can castle only if the king has not moved. If so, the black rook reached a2 ony by promoting on a1 which requires promotion by white whereas no white pawn is missing!  (Seetharaman) 
 

Comments  

 
0 #1 Diyan Kostadinov 2015-11-28 22:04
This nice twomover replace the other twomover n.630 which was published twice by mistake.
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